Samacheer Kalvi Class 11 Computer Science Solutions Chapter 13 Introduction to Object Oriented Pro

Book Evaluation

Part I

Choose The Correct Answer

 

Question 1. The term is used to describe a programming approach based on classes and objects is
(a) OOP
(b) POP
(c) ADT
(d) SOP
Answer: (a) OOP
In simple words: Object-Oriented Programming (OOP) is a way of writing computer programs using "objects" and "classes" to make code more organized.

🎯 Exam Tip: Remember that OOP focuses on classes and objects, which are core concepts of this programming style.

 

Question 2. The paradigm which aims more at procedures.
(a) Object Oriented Programming
(b) Procedural programming
(c) Modular programming
(d) Structural programming
Answer: (b) Procedural programming
In simple words: Procedural programming focuses on steps or procedures to do a task, using functions and routines.

🎯 Exam Tip: Distinguish between paradigms by understanding their primary focus: procedures for procedural, data for object-oriented.

 

Question 3. Which of the following is a user defined data type?
(a) class
(b) float
(c) int
(d) object
Answer: (a) class
In simple words: A class is like a blueprint that you create yourself to define a new type of data, unlike basic types like whole numbers (int) or decimal numbers (float).

🎯 Exam Tip: Understand that `int` and `float` are built-in (primitive) data types, while `class` allows programmers to create their own complex types.

 

Question 4. The identifiable entity with some characteristics and behaviour is.
(a) class
(b) object
(c) structure
(d) member
Answer: (b) object
In simple words: An object is a real item in a program that has certain qualities (characteristics) and can do things (behaviour). It's an instance of a class.

🎯 Exam Tip: Remember the distinction: a class is a blueprint, and an object is a specific item built from that blueprint.

 

Question 5. The mechanism by which the data and functions are bound together into a single unit is known as
(a) Inheritance
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (b) Encapsulation
In simple words: Encapsulation means keeping related data and the actions that work on that data (functions) bundled together in one package. This helps keep things organized and safe.

🎯 Exam Tip: Keywords for encapsulation are "binding together" and "single unit," implying a protective wrapper for data and methods.

 

Question 6. Insulation of the data from direct access by the program is called as
(a) Data hiding
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (a) Data hiding
In simple words: Data hiding means protecting the internal data of an object so that other parts of the program cannot directly change it. This is a key part of encapsulation.

🎯 Exam Tip: Data hiding ensures data security and prevents accidental modification, a crucial aspect of good programming practice.

 

Question 7. Which of the following concept encapsulate all the essential properties of the object that are to be created?
(a) class
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (d) Abstraction
In simple words: Abstraction means showing only the important parts and hiding the complex details. It lets you focus on what an object does, not how it does it.

🎯 Exam Tip: Abstraction simplifies complex systems by presenting only relevant information, which is vital for managing large programs.

 

Question 8. Which of the following is the most important advantage of inheritance?
(a) data hiding
(b) code reusability
(c) code modification
(d) accessibility
Answer: (b) code reusability
In simple words: Inheritance allows you to create new classes based on existing ones, so you can reuse code you've already written. This saves a lot of time and effort.

🎯 Exam Tip: Code reusability is the primary benefit of inheritance, reducing development time and improving consistency.

 

Question 9. “Write once and use it multiple time” can be achieved by
(a) redundancy
(b) reusability
(c) modification
(d) composition
Answer: (b) reusability
In simple words: Reusability means that once you write a piece of code, you can use it again and again in different parts of your program or in new programs. This makes programming faster and easier.

🎯 Exam Tip: Reusability is a key principle in modern programming, leading to more efficient and maintainable codebases.

 

Question 10. Which of the following supports the transitive nature of data?
(a) Inheritance
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (a) Inheritance
In simple words: Inheritance helps pass down qualities and behaviors from one class to another, just like how traits pass from parents to children. This creates a clear relationship between data.

🎯 Exam Tip: Inheritance is crucial for modeling "is-a" relationships between classes, forming a hierarchical structure for data and methods.

Part - II

Very Short Answer

 

Question 1. How is modular programming different from the procedural programming paradigm?
Answer: Modular programming and procedural programming have different ways of organizing code:
Modular Programming:

• It focuses more on algorithms than on the data itself.
• Programs are broken down into smaller, separate parts called modules.
• Each module works independently and has its own local data.
• Modules can use their own data or data passed to them from other modules.

Procedural Programming:

• Programs are built using subroutines or subprograms, like functions.
• Most data items are global, meaning they can be accessed from anywhere in the program.
• This approach is good for small software applications.
• It can be hard to update or change the program because any change to data might affect many subroutines. This makes maintenance time-consuming.

In simple words: Modular programming divides a program into independent parts, each with its own data. Procedural programming uses procedures or functions, and often shares data globally across the entire program.

🎯 Exam Tip: When differentiating, focus on the core organizational principle: modular programs prioritize independent units, while procedural programs prioritize a sequence of steps with shared global data.

 

Question 2. Differentiate classes and objects.
Answer: Here are the differences between classes and objects:
Class:
A class is like a blueprint or a template in C++. It bundles data and the functions that work on that data into a single unit using encapsulation. A class is a user-defined data type, meaning you create it yourself. For example, you might have a "Car" class.
Object:
An object is a real-world instance of a class. It is something identifiable that has its own unique qualities (characteristics) and can perform actions (behaviour). So, if "Car" is a class, then "myRedCar" or "yourBlueTruck" are objects of that class. Every object is a distinct entity.
In simple words: A class is a general plan or design for something, like a blueprint for a house. An object is a real item built from that plan, like an actual house you can see and touch.

🎯 Exam Tip: Clearly define each term and use a simple analogy (like blueprint/house) to illustrate the relationship between a class and an object.

 

Question 3. What is polymorphism?
Answer: Polymorphism is a key concept in object-oriented programming. It means "many forms." In programming, polymorphism is the ability for a message or a function to be presented or used in more than one way, or to display different forms depending on the context. For example, a "draw" function could draw a circle, a square, or a triangle, depending on the object it's called on. This flexibility makes code more adaptable.
In simple words: Polymorphism means one thing can take on many forms. It allows a single function or action to behave differently based on the type of data it is working with.

🎯 Exam Tip: Focus on the "many forms" aspect and how it allows for flexible function behavior in different contexts.

 

Question 4. How are encapsulation and abstraction are interrelated?
Answer: Encapsulation and abstraction are closely related in object-oriented programming. Encapsulation is the way we bundle data and the functions that operate on that data into a single unit. It acts like a protective wrapper around the data. This mechanism helps to implement abstraction. Abstraction means showing only the important features and hiding all the complex background details. For example, when you use a car, you abstract away the engine's internal workings and only focus on driving. Encapsulation helps achieve this by managing what parts of the data and functions are visible and accessible from outside the unit.
In simple words: Encapsulation puts data and functions together into one unit. Abstraction then uses this unit to show only the important information while hiding the complicated inner details. So, encapsulation is how you package things, and abstraction is what you choose to show from that package.

🎯 Exam Tip: Remember that encapsulation is the *technique* of bundling, and abstraction is the *concept* of hiding details, which encapsulation helps achieve.

 

Question 5. Write the disadvantages of OOP.
Answer: Object-Oriented Programming (OOP) has several disadvantages:

• Size: Object-Oriented Programs often tend to be much larger in terms of code size compared to other types of programs. This can make them harder to manage for simple tasks.
• Effort: Creating Object-Oriented Programs usually requires a significant amount of upfront effort and planning to design the classes and objects correctly.
• Speed: Due to their larger size and more complex structure, Object-Oriented Programs can sometimes run slower than other types of programs. This can be a concern in performance-critical applications.

In simple words: OOP programs can be big, take a lot of work to create, and sometimes run slower because they are complex.

🎯 Exam Tip: Focus on the common criticisms: increased code size, initial development complexity, and potential performance overhead.

Part - III

Short Answers

 

Question 1. What is a paradigm? Mention the different types of paradigm.
Answer: A paradigm is a fundamental way of thinking about or solving a problem. In programming, a paradigm means the core organizing principle of a program. It is an overall approach or style for how you structure and write computer programs.
There are different types of programming paradigms available for solving problems using computers:

• Procedural Programming
• Modular Programming
• Object-Oriented Programming

In simple words: A programming paradigm is a basic style or method for writing computer programs. Some common styles are procedural, modular, and object-oriented programming.

🎯 Exam Tip: Define "paradigm" clearly as a conceptual approach and list the main types mentioned in the curriculum.

 

Question 2. Write a note on the features of procedural programming.
Answer: Procedural programming is a programming paradigm that focuses on a sequence of steps or procedures to solve a problem. Here are its important features:

• Programs are organized as subroutines or subprograms, which are blocks of code that perform specific tasks.
• Most data items are global, meaning they can be accessed and modified from anywhere in the program.
• This approach is well-suited for smaller software applications where complexity is limited.
• It can be difficult to maintain and improve the program code. If there's a change in a data type, that change needs to be applied to all subroutines that use that data type, which is time-consuming.
• Examples of languages that use procedural programming include FORTRAN and COBOL.

In simple words: Procedural programming uses small programs (subroutines) to do tasks. It shares data everywhere and is good for small projects, but it can be hard to change later because data changes affect many parts.

🎯 Exam Tip: Highlight the global data aspect and the difficulty in maintenance as key characteristics of procedural programming.

 

Question 3. List some of the features of modular programming
Answer: Modular programming is a programming paradigm that emphasizes breaking a program into smaller, self-contained units called modules. Here are some of its important features:

• It places a strong emphasis on the algorithm (the steps to solve a problem) rather than on the data itself.
• Programs are divided into distinct individual modules, each performing a specific function.
• Each module works independently of others and manages its own local data.
• Modules can operate using their own internal data or process data that is given to them from other modules.
• Examples of languages that support modular programming include Pascal and C.

In simple words: Modular programming breaks a program into small, independent parts called modules. Each module does a specific job, has its own data, and can work with data given to it.

🎯 Exam Tip: Emphasize the independence and local data of modules as distinguishing features of modular programming.

 

Question 4. What do you mean by modularization and software reuse?
Answer: Modularization and software reuse are important concepts in programming:

• Modularization: This is the process of breaking down a large program into smaller, manageable parts called modules. Each module performs a specific, well-defined task, making the program easier to understand, develop, and maintain.
• Software Reuse: This concept involves building new programs by combining existing modules and components with newly developed ones. Instead of writing code from scratch every time, programmers can use parts of code that have already been tested and proven to work. This saves time and effort.

In simple words: Modularization means splitting a program into small, easy-to-handle pieces. Software reuse means using existing code parts to build new programs, so you don't have to write everything new each time.

🎯 Exam Tip: Clearly define each term, highlighting that modularization is about *decomposition* and software reuse is about *composition* with existing components.

 

Question 5. Define information hiding.
Answer: Information hiding is a programming principle where the internal details and data of a software component are kept private and are not directly accessible from outside that component. Only specific functions that are part of the component (wrapped within its class) can access this data. These functions act as a controlled interface between the object's data and the rest of the program. This protection of data from direct access is also known as data hiding. The main goal is to prevent external parts of the program from unintentionally changing or corrupting the internal state of an object.
In simple words: Information hiding means keeping the inner workings and data of a part of a program secret from other parts. Only specific tools (functions) linked to that part can touch its data, keeping it safe and organized.

🎯 Exam Tip: Connect information hiding with data protection and controlled access, emphasizing its role in maintaining data integrity and reducing complexity.

Part-IV

Explain in Detail

 

Question 1. Write the differences between object-oriented programming and procedural programming.
Answer: Object-Oriented Programming (OOP) and Procedural Programming are two different ways to write computer programs. Here are their main differences:
Object-Oriented Programming (OOP):

• OOP focuses on data rather than on just the steps (algorithms).
• It uses data abstraction, which means showing only important details and hiding the complex background.
• Data and the actions that operate on it (functions) are grouped together into a single unit called an object.
• Programs are designed around the data being operated, giving importance to objects.
• Examples of OOP languages include C++, Java, VB.Net, and Python.

Procedural Programming:

• Programs are organized into subroutines or subprograms, which are sequences of instructions.
• All data items are typically global, meaning they can be accessed from any part of the program.
• This approach is suitable for smaller software applications.
• It can be difficult to maintain and improve the program code, as any change in a data type often needs to be applied to all subroutines that use that data type. This process is time-consuming.
• Examples of procedural languages include FORTRAN and COBOL.

In simple words: OOP focuses on creating "objects" that combine data and actions, while procedural programming focuses on a list of steps or "procedures" to perform tasks, often using global data.

🎯 Exam Tip: Clearly outline differences in focus (data vs. procedures), data handling (encapsulated vs. global), and suitability for program size.

 

Question 2. What are the advantages of OOPs?
Answer: Object-Oriented Programming (OOP) offers several advantages that make it a popular choice for software development:

• Re-usability: OOP promotes the concept of "write once and use it multiple times." This means code can be reused in different parts of a program or in new projects, saving development time and effort.
• Redundancy: Inheritance is a powerful feature in OOP that helps reduce data redundancy. If multiple classes need the same functionality, a common base class can be written, and other classes can inherit from it, avoiding repeated code.
• Easy Maintenance: OOP makes programs easier to maintain and modify. When new objects need to be created or existing code needs changes, the encapsulated nature of objects means changes in one part are less likely to affect others, simplifying updates.
• Security: Through data hiding and abstraction, OOP provides better security. Only necessary data and functions are exposed to the outside world, preventing direct, unauthorized access and maintaining the integrity of the data.

In simple words: OOP helps us reuse code, avoid repeating ourselves, makes programs easier to fix and update, and keeps data safer by hiding details.

🎯 Exam Tip: List the advantages clearly with a concise explanation for each, focusing on how OOP addresses common programming challenges.

 

Question 3. Write a note on the basic concepts that support OOPs?
Answer: Object-Oriented Programming (OOP) was created to fix the problems found in procedural and modular programming. It is now widely seen as a very important and strong way to build software. The OOP approach mainly helps in:

• Modularization: breaking programs into small modules.
• Software reuse: building programs using existing and new modules.

The main features (or basic concepts) of Object-Oriented Programming that support it are:

• Data Abstraction
• Encapsulation
• Modularity
• Inheritance
• Polymorphism

Here's a brief explanation of some of these key concepts:
Encapsulation: This is the method by which data and the functions that work on that data are bundled together into a single unit. It implements abstraction by binding data variables and functions within a class. Encapsulation is also known as data binding and is a very important feature of a class. The data inside a class is not directly reachable from outside. Only the functions wrapped within the class can access it. These functions act as a bridge between the object's data and the program. This way of protecting data from direct access is called data hiding or information hiding.
Data Abstraction: Abstraction means showing only the important features without showing all the background details. Classes use abstraction to define a list of important qualities (attributes) and functions that operate on these qualities. They contain all the necessary properties for the object that will be created. These qualities are called data members because they hold information. The functions that work on this data are called methods or member functions.
Modularity: Modularity involves designing a system by dividing it into a set of functional units, often called modules. These modules can then be put together to form a larger application. Each module handles a specific part of the system independently.
Inheritance: This is a technique where new classes (called derived classes) are built from existing classes (called base classes). This allows the new class to reuse features and behavior from the old class. The biggest benefit of inheritance is code reusability.
Polymorphism: Polymorphism means that a message or a function can appear in more than one form or have different behaviors depending on the situation. It gives flexibility to functions to act differently based on the object they are working with.
In simple words: OOP is built on ideas like bundling data and actions (encapsulation), showing only key details (abstraction), breaking programs into parts (modularity), passing traits from one class to another (inheritance), and letting one thing act in many ways (polymorphism).

🎯 Exam Tip: Start with the purpose of OOP, list all the core concepts, and provide a clear, simple definition for each. Remember to explain how they interrelate where applicable.

11th Computer Science Guide Introduction to Object-Oriented Programming Techniques Additional Questions and Answers

Choose The Correct Answer (1 Mark)

 

Question 1. In procedural programming all data items are ....................
(a) Cobol
(b) global
(c) fortran
(d) class
Answer: (b) global
In simple words: In procedural programming, most data can be accessed and changed from anywhere in the program.

🎯 Exam Tip: Recall that procedural programming's global data access is a key differentiator from object-oriented programming.

 

Question 2. The object-oriented paradigm allows us to organize software as a collection of objects that consist of ....................
(a) Data
(b) Behaviour
(c) Both data and behaviour
(d) None of these
Answer: (c) Both data and behaviour
In simple words: In object-oriented programming, software is made up of objects that contain both information (data) and actions they can perform (behaviour).

🎯 Exam Tip: A fundamental concept in OOP is that objects encapsulate both data (attributes) and the methods (behaviors) that operate on that data.

 

Question 3. ........................ is an example of object-oriented programming
(a) Python
(b) Java
(c) VB.Net
(d) All of the options
Answer: (d) All of the options
In simple words: Python, Java, and VB.Net are all programming languages that use the object-oriented style.

🎯 Exam Tip: Familiarize yourself with common OOP languages as examples to support your understanding of the paradigm.

 

Question 4. Paradigm means .............................
(a) Organizing principle of a program
(b) An approach to programming
(c) Either A or B
(d) None of these
Answer: (c) Either A or B
In simple words: A programming paradigm is essentially a way or method of structuring a program, like a guiding principle.

🎯 Exam Tip: A paradigm describes the fundamental style or approach to building software, encompassing both organization and methodology.

 

Question 5. ........................ is about binding the data variables and functions together in class.
(a) Data abstraction
(b) Modularization
(c) Redundancy
(d) Encapsulation
Answer: (d) Encapsulation
In simple words: Encapsulation is the process of bundling data and the functions that work on it into a single unit, called a class.

🎯 Exam Tip: Encapsulation is the act of wrapping data and methods within a class, often for data protection.

 

Question 6. In ........................ approach programs are organized in the form of subroutines or subprograms.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (b) Procedural Programming
In simple words: Procedural programming arranges code into smaller pieces called subroutines or subprograms.

🎯 Exam Tip: Remember that procedural programming emphasizes breaking down tasks into a sequence of procedures or functions.

 

Question 7. ........................ approach of the program is time-consuming.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (b) Procedural Programming
In simple words: The procedural approach can take a lot of time, especially when changes are needed, because global data affects many parts.

🎯 Exam Tip: Procedural programming can become time-consuming due to the complexities of managing global data and the ripple effect of changes.

 

Question 8. __________ language is based on procedural programming.
(a) FORTRAN
(b) COBOL
(c) Both A and B
(d) C++
Answer: (c) Both A and B
In simple words: Both FORTRAN and COBOL are older programming languages that follow a step-by-step, procedural way of working. They focus on commands and actions.

🎯 Exam Tip: Remember that procedural languages focus on a sequence of instructions, while object-oriented languages focus on data and objects.

 

Question 9. __________ paradigm consists of multiple modules; each module has a set of functions of related types.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (a) Modular Programming
In simple words: Modular programming breaks a big program into smaller, separate parts called modules. Each module does a specific job and groups related functions.

🎯 Exam Tip: Modular programming helps organize code, making large projects easier to understand, test, and maintain by dividing them into manageable components.

 

Question 10. In __________ approach data is hidden under the modules
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (a) Modular Programming
In simple words: In modular programming, data can be kept private inside its modules, so other parts of the program cannot directly see or change it. This is a form of information hiding.

🎯 Exam Tip: Data hiding within modules is a key aspect of good software design, preventing accidental changes and making programs more robust.

 

Question 11. __________ language is based on modular programming.
(a) Pascal
(b) C
(c) Both A and B
(d) C++
Answer: (c) Both A and B
In simple words: Both Pascal and C languages use a modular style, where you can split your code into different parts or modules. This makes code more organized.

🎯 Exam Tip: Pascal and C are known for their structured programming capabilities, which include modular design, allowing developers to break down large programs into smaller, manageable functions or procedures.

 

Question 12. __________ paradigm emphasizes the data rather than the algorithm.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: Object-Oriented Programming (OOP) focuses on data and creating "objects" from it, not just on the steps needed to solve a problem. It aims to model real-world entities.

🎯 Exam Tip: OOP's emphasis on data helps create programs that are easier to understand, maintain, and adapt to changes, as data and its operations are kept together.

 

Question 13. __________ implements programs using classes and objects.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: Object-Oriented Programming (OOP) builds programs by making "classes" (which are like plans) and "objects" (which are items made from those plans).

🎯 Exam Tip: Understanding the relationship between classes and objects is fundamental to grasping OOP concepts. A class defines a type, while an object is a real instance of that type.

 

Question 14. A __________ is a construct in C++ which is used to bind data and its associated function together into a single unit.
(a) Class
(b) Structure
(c) Array
(d) None of these
Answer: (a) Class
In simple words: In C++, a "class" is like a box that holds both information (data) and the actions (functions) that can be done with that information, keeping them as one unit.

🎯 Exam Tip: The ability of a class to combine data and functions is a core principle of encapsulation, a key feature of OOP.

 

Question 15. A Class is a construct in C++ which uses the __________ concept.
(a) Polymorphism
(b) Encapsulation
(c) Abstraction
(d) Inheritance
Answer: (b) Encapsulation
In simple words: A C++ class uses encapsulation. This means it puts data and the functions that use it into one package, keeping them safe and private.

🎯 Exam Tip: Encapsulation is crucial for data security and simplifies code by controlling how data can be accessed and modified, leading to more robust software.

 

Question 16. Class is a __________ data type.
(a) User-defined
(b) Derived
(c) Primitive
(d) None of these
Answer: (a) User-defined
In simple words: A class is a data type that you, the programmer, create yourself to suit your specific needs. It's not a basic type like numbers or text.

🎯 Exam Tip: User-defined data types like classes help model complex real-world entities in programming, making code more organized and readable.

 

Question 17. __________ can be defined as a template or blueprint representing a group of objects that share common properties and relationship.
(a) Class
(b) Structure
(c) Array
(d) None of these
Answer: (a) Class
In simple words: A "class" is like a general plan or design. Many "objects" can be made from this plan, and they will all have similar features and behaviors.

🎯 Exam Tip: Think of a class as the cookie cutter and objects as the cookies themselves. The class defines the shape, and the objects are the actual instances.

 

Question 18. __________ are the basic unit of OOP.
(a) Attributes
(b) Objects
(c) Members
(d) None of these
Answer: (b) Objects
In simple words: "Objects" are the main things used in Object-Oriented Programming (OOP). They are like specific items made from a class blueprint, each with its own data and actions.

🎯 Exam Tip: Objects combine both data and the functions that operate on that data, forming a self-contained unit crucial for modular design.

 

Question 19. The class variables are called __________
(a) Instances
(b) Objects
(c) Either A or B
(d) None of these
Answer: (c) Either A or B
In simple words: The variables that belong to a class are sometimes called "instances" or "objects." They hold the data for each item created from that class.

🎯 Exam Tip: Class variables hold the state of an object, meaning the specific values for its attributes at any given time, defining its current condition.

 

Question 20. An identifiable entity with some characteristics and behaviour is called __________
(a) Instances
(b) Objects
Answer: (b) Objects
In simple words: An "object" is something you can identify that has its own features (data) and can do things (behavior).

🎯 Exam Tip: Objects are distinct entities that encapsulate both data and the methods that operate on that data, making them self-contained and modular components in a program.

 

Question 21. In __________ method, programs are designed around the data being operated.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
(d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: In Object-Oriented Programming (OOP), programs are built by focusing on the data first, and then figuring out how to work with that data through objects.

🎯 Exam Tip: This data-centric approach of OOP contrasts with procedural programming, which typically focuses on the sequence of actions or algorithms.

 

Question 22. __________ language is based on object-oriented programming.
(a) C++, Java
(b) VB.Net
(c) Python
(d) All of the options
Answer: (d) All of the options
In simple words: Languages like C++, Java, VB.Net, and Python all use object-oriented programming ideas. So, all these options are correct.

🎯 Exam Tip: While these languages primarily support OOP, some also support other programming paradigms, offering flexibility to developers based on project requirements.

 

Question 23. __________ is widely accepted that object-oriented programming is the most important and powerful way of creating software.
(a) Modular Programming
(b) Procedural Programming
(c) Object-Oriented Programming
Answer: (c) Object-Oriented Programming
In simple words: Many people agree that Object-Oriented Programming is a very strong and useful way to build software programs because of its efficiency.

🎯 Exam Tip: OOP's popularity stems from its ability to manage complexity, promote code reuse, and model real-world problems effectively in software development.

 

Question 24. The Object-Oriented Programming approach mainly encourage __________
(a) Modularisation
(b) Software re-use
(c) Both A and B
(d) None of these
Answer: (c) Both A and B
In simple words: Object-Oriented Programming (OOP) encourages breaking programs into smaller parts (modularization) and using existing code again (software reuse). Both are important benefits.

🎯 Exam Tip: Modularity and reusability are key advantages of OOP, leading to more efficient and maintainable software development cycles.

 

Question 25. __________ means the program can be decomposed into modules.
(a) Modularisation
(b) Software re-use
(c) Both A and B
(d) None of these
Answer: (a) Modularisation
In simple words: Modularization means splitting a program into many smaller, separate parts called modules. This makes the program easier to manage.

🎯 Exam Tip: Each module typically performs a specific function, improving the organization and readability of the overall code and simplifying debugging.

 

Question 26. __________ means, a program can be composed of existing and new modules.
(a) Modularisation
(b) Software re-use
(c) Both A and B
(d) None of these
Answer: (b) Software re-use
In simple words: Software re-use means using parts of programs that already exist along with new parts to build a new program. This saves time and effort.

🎯 Exam Tip: Reusing well-tested code can significantly reduce development time and improve the reliability of new software projects, leading to more efficient processes.

 

Question 27. The main feature of Object-Oriented Programming is __________
(a) Data Abstraction and Encapsulation
(b) Modularity
(c) Inheritance and Polymorphism
(d) All of the options
Answer: (d) All of the options
In simple words: All the options listed - Data Abstraction, Encapsulation, Modularity, Inheritance, and Polymorphism - are important features of Object-Oriented Programming. They are often called the pillars of OOP.

🎯 Exam Tip: These core concepts are crucial for understanding how OOP allows for flexible, maintainable, and scalable software design by managing complexity effectively.

 

Question 28. __________ implements abstraction
(a) Polymorphism
(b) Encapsulation
(c) Abstraction
(d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation helps create abstraction. It wraps up details, so you only see what's important, not all the small parts inside.

🎯 Exam Tip: While abstraction defines what an object does, encapsulation provides the means to achieve that by hiding the complex internal implementation details.

 

Question 29. __________ can be called data binding.
(a) Polymorphism
(b) Encapsulation
(c) Abstraction
(d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation is like "data binding" because it ties data and the actions for that data together inside one class, keeping them linked.

🎯 Exam Tip: Data binding through encapsulation helps maintain data integrity by restricting direct access and modifications, enhancing program reliability.

 

Question 30. __________ is the most striking feature of a class,
(a) Polymorphism
(b) Encapsulation
(c) Abstraction
(d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation is the most notable feature of a class. It means putting data and the functions that use it into one neat package.

🎯 Exam Tip: This feature helps in creating secure and well-organized code, as it protects data from unintended external access, ensuring consistent behavior.

 

Question 31. The encapsulation of data from direct access by the program is called __________
(a) Data hiding
(b) Information hiding
(c) Either A or B
(d) None of these
Answer: (c) Either A or B
In simple words: When data is kept safe from direct access by other parts of a program, it's called either "data hiding" or "information hiding." Both terms mean the same thing.

🎯 Exam Tip: Data hiding is a key benefit of encapsulation, ensuring that internal data can only be manipulated through the class's defined methods, which prevents errors.

 

Question 32. __________ refers to showing only the essential features without revealing background details,
(a) Polymorphism
(b) Encapsulation
(c) Abstraction
(d) Inheritance
Answer: (c) Abstraction
In simple words: Abstraction means showing only the important parts of something and hiding all the complex stuff that happens behind the scenes.

🎯 Exam Tip: Abstraction simplifies complex systems by presenting a higher-level view, making them easier to understand and use without getting bogged down in details.

 

Question 33. The attributes are called __________
(a) Data members
(b) Methods
(c) Member functions
(d) Either B or C
Answer: (a) Data members
In simple words: The features or qualities of an object, like its name or size, are called "data members." They store the information about the object.

🎯 Exam Tip: Data members represent the state of an object, holding values that define its current condition, and distinguish one object from another.

 

Question 34. __________ hold information.
(a) Data members
(b) Methods
(c) Member functions
(d) Either B or C
Answer: (a) Data members
In simple words: "Data members" are like containers within a class that keep information inside them for an object. They store the object's properties.

🎯 Exam Tip: Unlike methods (which perform actions), data members are primarily for storing values and defining an object's state, making them crucial for holding data.

 

Question 35. The functions that operate on data numbers are called __________
(a) Data members
(b) Methods
(c) Member functions
(d) Either B or C
Answer: (d) Either B or C
In simple words: The special actions or functions that work with an object's data are called either "methods" or "member functions." Both terms mean the same thing.

🎯 Exam Tip: Methods define the behavior of an object, dictating how it interacts with its own data and other objects, allowing controlled modification of data.

 

Question 36. __________ is designing a system that is divided into a set of functional units.
(a) Polymorphism
(b) Modularity
(c) Abstraction
(d) Inheritance
Answer: (b) Modularity
In simple words: "Modularity" means designing a system by dividing it into smaller, separate parts, each doing a specific job. This helps organize the system.

🎯 Exam Tip: Modularity helps manage complexity, allows for parallel development, and makes testing and debugging easier by isolating functional units.

 

Question 37. __________ is the technique of building new classes from an existing class,
(a) Polymorphism
(b) Modularity
(c) Abstraction
(d) Inheritance
Answer: (d) Inheritance
In simple words: "Inheritance" is a way to make new classes by using what's already in an old class. The new class gets all the features of the old one, saving time.

🎯 Exam Tip: Inheritance promotes code reusability and establishes a "is-a" relationship between classes (e.g., a "Car" *is-a* "Vehicle"), forming a hierarchy.

 

Question 38. In inheritance, the existing class is called as __________ class.
(a) Base
(b) Derived
(c) Abstract
(d) None of these
Answer: (a) Base
In simple words: In inheritance, the first class that other classes are built from is called the "base" class. It's the parent class.

🎯 Exam Tip: The base class contains common attributes and methods that are shared by its derived classes, forming the foundation of the class hierarchy.

 

Question 39. In inheritance, the newly created class is called as __________ class.
(a) Base
(b) Derived
(c) Abstract
(d) None of these
Answer: (b) Derived
In simple words: When you make a new class using inheritance, that new class is called a "derived" class. It's the child class.

🎯 Exam Tip: A derived class can add its own unique features and override inherited ones, tailoring the functionality to its specific needs while reusing existing code.

 

Question 40. __________ is the ability of a message or function to be displayed in more than one form.
(a) Polymorphism
(b) Modularity
(c) Abstraction
(d) Inheritance
Answer: (a) Polymorphism
In simple words: "Polymorphism" means that one thing (like a function) can act in different ways or have different forms depending on the situation.

🎯 Exam Tip: Polymorphism is often achieved through method overloading (same name, different parameters) or method overriding (same name, different implementation in derived classes), providing flexibility.

 

Question 41. __________ means, write once and use it multiple times.
(a) Re-usability
(b) Redundancy
(c) Security
(d) None of these
Answer: (a) Re-usability
In simple words: "Re-usability" means you write some code just one time, and then you can use it again and again in many places or different programs.

🎯 Exam Tip: Code reusability significantly improves productivity and consistency in software development, as proven and tested code can be leveraged repeatedly.

 

Question 42. If we need the same functionality in multiple class you will write a common class for the same functionality and inherit that class to subclass is called __________
(a) Re-usability
(b) Redundancy
(c) Security
(d) None of these
Answer: (b) Redundancy
In simple words: When you make one main class with features that many other classes need, and those other classes get those features from the main one, it helps avoid repeating the same code. This idea relates to managing redundancy.

🎯 Exam Tip: Inheritance is a primary OOP mechanism used to eliminate code duplication (redundancy) by allowing specialized classes to reuse attributes and methods from a general class.

 

Question 43. __________ is a good feature for data redundancy.
(a) Polymorphism
(b) Modularity
(c) Abstraction
(d) Inheritance
Answer: (d) Inheritance
In simple words: Inheritance is a good tool because it helps stop you from having to write the same data over and over again in different parts of your program, reducing repetition.

🎯 Exam Tip: By promoting code reuse, inheritance ensures consistency across related classes and reduces the overall size of the codebase, making it more efficient.

 

Question 44. __________ programs are much larger than other programs.
(a) Modular
(b) Procedural
(c) Object-Oriented
(d) All of the options
Answer: (c) Object-Oriented
In simple words: Programs made using object-oriented methods are usually bigger in size than programs made in other ways. This is due to how classes and objects are structured.

🎯 Exam Tip: Despite their larger size, OOP programs often offer advantages in terms of maintainability, flexibility, and scalability for complex projects, outweighing the size factor.

 

Question 45. __________ program requires a lot of work to create.
(a) Modular
(b) Procedural
(c) Object-Oriented
Answer: (c) Object-Oriented
In simple words: Building object-oriented programs needs a lot of hard work because you have to plan out all the classes and objects carefully from the beginning.

🎯 Exam Tip: The initial investment in designing an OOP system often pays off in the long run with easier maintenance, greater adaptability, and more reusable code.

 

Question 46. __________ programs are slower than other programs, because of their size.
(a) Modular
(b) Procedural
(c) Object-Oriented
(d) All of the options
Answer: (c) Object-Oriented
In simple words: Object-oriented programs can be slower because they are often bigger and need more work from the computer to manage their objects and classes.

🎯 Exam Tip: Performance differences are often negligible for modern systems, but for highly optimized or resource-constrained applications, this factor might be considered in design choices.

Very Short Answers 2 Marks

 

Question 1. Write a note on an object-oriented program.
Answer: Object-Oriented Programming (OOP) is a style of creating programs that relies on the concepts of classes and objects. In this approach, software is structured as a group of objects, each containing both data (information) and behavior (actions it can perform). It helps model real-world entities in code effectively. This paradigm helps organize software as a collection of objects that consist of both data and behavior.
In simple words: Object-Oriented Programming, or OOP, is a way to build computer programs using "classes" and "objects." Each "object" has its own data and can do certain actions, helping to organize the software.

🎯 Exam Tip: OOP focuses on creating modular and reusable code, making complex software easier to manage and update by breaking it into distinct, interacting units.

 

Question 2. What is modularity?
Answer: Modularity is a design method where a computer system is broken down into several independent, functional parts called modules. These smaller modules can then be combined to form a complete, larger application. This helps in managing the complexity of big projects. Modularity enhances program structure and maintainability.
In simple words: Modularity means designing a system by splitting it into smaller, separate parts called modules. These parts can then be put together to make a bigger program.

🎯 Exam Tip: Modularity makes code easier to develop, test, and maintain because each module can be worked on independently, reducing errors and speeding up development.

 

Question 3. Define Data binding.
Answer: Data binding is the process of linking data variables with the functions that operate on them, specifically within a class. This concept is often used interchangeably with encapsulation, which secures these elements together into a single unit. Essentially, it ensures data and its operations are kept together, preventing unintended external access. Data binding promotes organized and protected data handling.
In simple words: Data binding is when you connect data (like numbers or text) with the functions that use that data inside a class. It's another name for encapsulation, keeping them together.

🎯 Exam Tip: Data binding is crucial for maintaining data integrity and ensuring that data is accessed and modified only through defined methods, enhancing overall program security.

Short Answers (3 Marks)

 

Question 1. Write about objects.
Answer: In programming, an object is a single unit that combines data and its related functions. Objects are the fundamental building blocks of Object-Oriented Programming (OOP). They are created from a class, which acts as a blueprint, and can also be called instances of that class. An object is essentially an identifiable entity that has specific characteristics and behaviors. This helps to model real-world items in a program.
In simple words: An object is like a single package that holds both information (data) and actions (functions) together. It is the basic unit in OOP and is made from a class blueprint, with its own unique features and behaviors.

🎯 Exam Tip: Objects help model real-world entities in a program, encapsulating their state (data) and behavior (methods) for a more intuitive and organized design.

 

Question 2. What are Encapsulation and data binding?
Answer: Encapsulation is a core concept in object-oriented programming where data and the methods that operate on that data are bundled together into a single unit, typically a class. It is considered a key characteristic of a class. With encapsulation, data within the class cannot be directly accessed from outside; instead, only the functions defined within that class can interact with it. These functions act as an interface. This protection of data from direct external access is also known as data hiding or information hiding. Encapsulation helps to keep data safe and organized within its own unit.
In simple words: Encapsulation means keeping data and the code that uses it together in one secure unit, usually inside a class. It stops other parts of the program from directly touching the data, allowing only its own functions to work with it. This is also called data hiding.

🎯 Exam Tip: Encapsulation improves code security and maintainability by preventing unauthorized access and changes to an object's internal state, leading to robust and predictable programs.

Book Evaluation

Part I

Choose The Correct Answer

 

Question 1. The term is used to describe a programming approach based on classes and objects is
(a) OOP
(b) POP
(c) ADT
(d) SOP
Answer: (a) OOP
In simple words: OOP stands for Object-Oriented Programming. It is a way of writing computer programs using things called 'classes' and 'objects' to organize the code.

🎯 Exam Tip: Remember that OOP focuses on objects and classes as its fundamental building blocks, making it distinct from other programming paradigms.

 

Question 2. The paradigm which aims more at procedures.
(a) Object Oriented Programming
(b) Procedural programming
(c) Modular programming
(d) Structural programming
Answer: (b) Procedural programming
In simple words: Procedural programming focuses on steps or procedures to get things done, like following a recipe step-by-step.

🎯 Exam Tip: Distinguish procedural programming by its emphasis on functions and step-by-step instructions, rather than on data organization like in OOP.

 

Question 3. Which of the following is a user defined data type?
(a) class
(b) float
(c) int
(d) object
Answer: (a) class
In simple words: A 'class' is a special type you create yourself in a program, like making your own blueprint for something new. Other types like 'float' and 'int' are already built into the computer language.

🎯 Exam Tip: Understand that user-defined data types, like classes, give programmers the flexibility to create complex data structures tailored to specific problems.

 

Question 4. The identifiable entity with some characteristics and behaviour is.
(a) class
(b) object
(c) structure
(d) member
Answer: (b) object
In simple words: An 'object' is like a real-world thing in your program; it has its own features (like color) and things it can do (like move).

🎯 Exam Tip: Remember that an object is an instance of a class, meaning it's a concrete item created from the class blueprint, having actual data and actions.

 

Question 5. The mechanism by which the data and functions are bound together into a single unit is known as
(a) Inheritance
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (b) Encapsulation
In simple words: Encapsulation is like putting related data and the code that works on it inside a single box, protecting it from outside interference. This helps keep things organized and safe.

🎯 Exam Tip: Encapsulation is key for data hiding and creating modular, easy-to-manage code by bundling data and methods together.

 

Question 6. Insulation of the data from direct access by the program is called as
(a) Data hiding
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (a) Data hiding
In simple words: Data hiding means keeping the inner details of data secret, so other parts of the program cannot change it directly without permission. This makes the program more reliable.

🎯 Exam Tip: Data hiding is a core principle of good software design, protecting data integrity and simplifying debugging by controlling access.

 

Question 7. Which of the following concept encapsulate all the essential properties of the object that are to be created?
(a) class
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (d) Abstraction
In simple words: Abstraction means showing only the important parts of something and hiding all the complex details. It lets you focus on what an object does, not how it does it.

🎯 Exam Tip: Think of abstraction as focusing on the "what" rather than the "how," simplifying complex systems by presenting only essential information to the user.

 

Question 8. Which of the following is the most important advantage of inheritance?
(a) data hiding
(b) code reusability
(c) code modification
(d) accessibility
Answer: (b) code reusability
In simple words: Inheritance helps you use existing code again, saving time and making programs shorter. It's like building a new car model that shares parts from an older model.

🎯 Exam Tip: Code reusability is a huge benefit of inheritance, reducing development time and potential errors by building upon proven existing code.

 

Question 9. "Write once and use it multiple time" can be achieved by
(a) redundancy
(b) reusability
(c) modification
(d) composition
Answer: (b) reusability
In simple words: Reusability means you can create a piece of code once and then use it many times in different parts of your program or in other programs. This saves time and effort.

🎯 Exam Tip: The concept of "write once, use many times" directly translates to reusability, a cornerstone of efficient programming.

 

Question 10. Which of the following supports the transitive nature of data?
(a) Inheritance
(b) Encapsulation
(c) Polymorphism
(d) Abstraction
Answer: (a) Inheritance
In simple words: Inheritance allows properties and behaviors to be passed down from one class to another, creating a chain-like or 'transitive' relationship for data and functions. For example, if A is related to B, and B is related to C, then A is also related to C.

🎯 Exam Tip: Recognize that inheritance creates a hierarchy, where derived classes inherit characteristics from base classes, forming a natural transitive link.

Part - II

Very Short Answer

 

Question 1. How is modular programming different from the procedural programming paradigm?
Answer:
Modular programming:

• It focuses more on the algorithm than on the data.
• Programs are divided into many small, separate parts called modules.
• Each module works independently and has its own local data.
• Modules can use their own data or data given to them. Modular design helps in team-based development, where different teams can work on different modules.

Procedural programming:

• Programs are made of subroutines or subprograms.
• All data items are shared globally.
• This approach is suitable for smaller software applications.
• It is hard to keep programs updated and fix them, because any change in how data is stored needs to be updated in all parts of the program that use that data.

In simple words: Modular programming breaks programs into independent units, focusing on algorithms and local data, while procedural programming uses subprograms and global data, which can be harder to manage for larger projects.

🎯 Exam Tip: Highlight the key differences: modular programming emphasizes independent modules and data locality, whereas procedural programming relies on procedures and global data, which has implications for maintenance and scalability.

 

Question 2. Differentiate classes and objects.
Answer:
Class: A class in C++ is like a blueprint used to group data and its related functions into a single unit. It uses the concept of encapsulation. A class is a type of data that the user defines. For example, a "Car" class could define what all cars have in common.
Object: An object is something that can be identified and has its own features and actions. It is a real-world instance of a class. For example, "myRedCar" could be an object of the "Car" class. Each object has its unique identity, state, and behavior, derived from its class. It is the basic unit in Object-Oriented Programming.

🎯 Exam Tip: Remember that a class is a blueprint or template, defining the structure, while an object is a real-life instance of that blueprint, with actual values for its characteristics.

 

Question 3. What is polymorphism?
Answer: Polymorphism is when a message or function can appear in more than one form. It means "many forms." For example, a "shape" function could draw a circle, a square, or a triangle, depending on the object it is called with. This allows different objects to respond to the same message in their own unique ways.

🎯 Exam Tip: The core idea of polymorphism is "many forms" – a single name can perform different actions depending on the context or the object it's associated with.

 

Question 4. How are encapsulation and abstraction are interrelated?
Answer: Encapsulation is the way data and functions are bundled into a single unit, like a capsule. This process helps to achieve abstraction. Abstraction means showing only the important parts and hiding the complex background details. Encapsulation provides the necessary structure to implement abstraction by keeping the details hidden inside the unit.

🎯 Exam Tip: Think of encapsulation as the mechanism (the "how") and abstraction as the goal (the "what"). Encapsulation is the act of wrapping, while abstraction is the concept of showing only essentials.

 

Question 5. Write the disadvantages of OOP.
Answer:
1. Size: Object-Oriented Programs are often much larger than other types of programs. This can make them take up more memory.
2. Effort: Creating Object-Oriented Programs needs a lot of planning and work. It takes more time to design the classes and objects properly.
3. Speed: Because of their larger size and more complex structure, Object-Oriented Programs can sometimes run slower than other types of programs. This might be a concern in systems where speed is critical.

🎯 Exam Tip: When listing disadvantages, focus on specific areas like resource consumption (size), development complexity (effort), and performance (speed) as they are common trade-offs.

Part - III

Short Answers

 

Question 1. What is a paradigm? Mention the different types of paradigm.
Answer: A paradigm is a way of organizing the principles of a program. It is an overall approach or style of programming. Different ways are available for solving problems using computers. These different types of programming approaches are:

• Procedural programming
• Modular Programming
• Object-Oriented Programming

In simple words: A paradigm is a basic style or method of writing computer programs. The main types are procedural, modular, and object-oriented programming.

🎯 Exam Tip: Define a paradigm as an approach or model for problem-solving in programming, and then clearly list the main types you've studied.

 

Question 2. Write a note on the features of procedural programming.
Answer: Important features of procedural programming include:
1. Programs are built using subroutines or subprograms, which are sets of instructions.
2. All data items in the program are global, meaning they can be accessed from any part of the program.
3. It is best for small software applications because managing shared global data becomes complex in larger projects.
4. It is difficult to maintain and improve the program's code, because if any data type changes, that change must be updated in all subroutines that use the same data type. This process takes a lot of time.
5. Examples of languages using procedural programming are FORTRAN and COBOL.

🎯 Exam Tip: When describing procedural programming, focus on the use of subprograms, global data, and the challenges this brings for larger, evolving systems.

 

Question 3. List some of the features of modular programming
Answer: Important features of modular programming:

• It gives more importance to the algorithm (the steps to solve a problem) rather than the data itself.
• Programs are split into smaller, manageable units called individual modules.
• Each module works independently and manages its own local data, separate from other modules. This helps prevent unexpected interactions.
• Modules can either work with their own data or with data that is given to them by other parts of the program.
• Examples of languages that support modular programming include Pascal and C.

In simple words: Modular programming focuses on algorithms, divides programs into independent modules with their own data, and allows modules to work together or alone.

🎯 Exam Tip: Emphasize that modularity is about breaking down a program into independent, self-contained units, which improves organization and maintainability.

 

Question 4. What do you mean by modularization and software reuse?
Answer:
1. Modularization: This is the process where a large program is broken down or split into smaller, individual units called modules. Each module performs a specific task. Breaking a program into modules makes it easier to understand, manage, and debug.
2. Software reuse: This means building a new program by using existing modules and adding new ones. Instead of writing all code from scratch, programmers can use parts that have already been created and tested, saving time and effort. This makes development faster and more reliable.

🎯 Exam Tip: Define modularization as decomposition into modules and software reuse as combining existing and new modules, highlighting how both improve efficiency and quality.

 

Question 5. Define information hiding.
Answer: Information hiding means that the data inside a class is not directly available to the outside parts of the program. Only the special functions that are part of that class can access or change this data. These functions act like a bridge between the data and the rest of the program. This process of protecting data from direct outside access is called data hiding or information hiding. This ensures data integrity and helps in managing complexity.

🎯 Exam Tip: The key idea of information hiding is restricting direct access to internal data and exposing it only through defined interfaces (functions) to protect its integrity.

Part-IV

Explain in Detail

 

Question 1. Write the differences between object-oriented programming and procedural programming.
Answer:
Object-Oriented Programming (OOP):

• OOP focuses on data rather than just algorithms. It treats data as a central element.
• Data abstraction is used along with procedural abstraction. This means hiding complex implementation details while showing only necessary information.
• Data and the operations that work on that data are bundled together into a single unit (an object).
• Programs are designed primarily around the data that is being processed and manipulated.
• Examples include languages like C++, Java, VB.Net, and Python.

Procedural Programming:

• Programs are organized as collections of subroutines or smaller programs that perform specific tasks.
• All data items in a procedural program are generally global, meaning they can be accessed and modified from anywhere in the program.
• It is suitable for developing small-sized software applications because managing global data can become difficult as programs grow.
• It is hard to maintain and update the program code. If there's a change in a data type, that change needs to be applied and tracked across all subroutines that use that particular data type.
• Examples include languages like FORTRAN and COBOL.

In simple words: OOP focuses on data and objects, grouping data with actions, and uses abstraction. Procedural programming focuses on steps and subprograms, uses global data, and can be harder to manage for bigger projects.

🎯 Exam Tip: When comparing, structure your answer by contrasting key aspects like focus (data vs. procedures), data handling (encapsulated vs. global), and suitability (large vs. small applications).

 

Question 2. What are the advantages of OOPs?
Answer: Here are the advantages of Object-Oriented Programming (OOP):
Re-usability: OOP allows you to "write once and use it multiple times" by creating classes. You can reuse existing classes and objects in new parts of the program or in entirely different projects. This saves development time and reduces errors.
Redundancy: Inheritance is a powerful feature in OOP that helps avoid writing the same code again and again. If you need similar functions in several classes, you can create a common base class with that function and then inherit it into other classes. This reduces redundant code.
Easy Maintenance: OOP makes programs easier to maintain and modify. When changes are needed, you only have to update the relevant classes or objects, rather than searching through the entire code. This modularity simplifies fixing bugs or adding new features.
Security: Using data hiding and abstraction ensures that only essential data is shown, and other details are kept private. This control over data access helps maintain the security of the data within the program.

🎯 Exam Tip: When discussing advantages, use clear headings for each benefit (Reusability, Redundancy, Maintenance, Security) and explain how OOP principles achieve them.

 

Question 3. Write a note on the basic concepts that support OOPs?
Answer: Object-Oriented Programming (OOP) was created to overcome the problems found in procedural and modular programming. It is widely considered the most important and powerful way to create software. The OOP approach mainly encourages:
1. Modularization: This is where a program is broken down into smaller, self-contained units called modules.
2. Software reuse: This means a program can be built using both existing and newly created modules, saving development time.

Main Features of Object-Oriented Programming:
1. Data Abstraction
2. Encapsulation
3. Modularity
4. Inheritance
5. Polymorphism

Encapsulation: This is the process where data and functions are bundled together into a single unit, which is called Encapsulation. It helps to achieve abstraction. Encapsulation is about combining the data variables and the functions that operate on them into a class. It can also be referred to as data binding. Encapsulation is a very important feature of a class. The data inside is not directly accessible to the outside world. Only the functions wrapped within the class can access it. These functions act as a bridge between the object's data and the rest of the program. This act of protecting data from direct access is known as data hiding or information hiding.

Data Abstraction: Abstraction means showing only the important features without revealing all the complex background details. Classes use abstraction to define a list of essential features and functions that work on these features. They include all the important properties of the object that needs to be created. These properties are called data members because they hold information. The functions that work on this data are known as methods or member functions.

Modularity: Modularity involves designing a system by dividing it into a set of functional units, also known as named modules. These modules can then be put together to form a larger application. This makes the system easier to manage and understand.

Inheritance: Inheritance is a technique for creating new classes (called derived classes) from existing classes (called base classes). The most important benefit of inheritance is code reusability. It allows a new class to reuse features from an existing class.

Polymorphism: Polymorphism is the ability of a message or function to appear in more than one form. This means a single function name can behave differently depending on the type of object it is called on. For example, a "draw" function might draw a circle for a Circle object and a square for a Square object.

🎯 Exam Tip: For a comprehensive answer on OOP concepts, define each feature (Encapsulation, Abstraction, Modularity, Inheritance, Polymorphism) and briefly explain its role and benefits, often using a simple analogy for clarity.

11th Computer Science Guide Introduction to Object-Oriented Programming Techniques Additional Questions and Answers

Choose The Correct Answer (1 Mark)

 

Question 1. In procedural programming all data items are ..................
(a) Cobol
(b) global
(c) fortran
(d) class
Answer: (b) global
In simple words: In procedural programming, data is often shared everywhere in the program, meaning it's 'global'.

🎯 Exam Tip: Remember that global data access is a defining characteristic of procedural programming, contrasting with the localized data in OOP.

 

Question 2. The object-oriented paradigm allows us to organize software as a collection of objects that consist of ..................
a) Data
b) Behaviour
c) Both data and behaviour
d) None of the options
Answer: (c) Both data and behaviour
In simple words: Object-oriented programming (OOP) organizes software by combining both the data (information) and the behavior (actions) related to it into units called objects.

🎯 Exam Tip: A core tenet of OOP is that objects encapsulate both data (attributes) and methods (behaviors), making them self-contained units.

 

Question 3. .................. is an example of object-oriented programming
(a) Python
(b) Java
(c) VB.Net
(d) All of the options
Answer: (d) All of the options
In simple words: Python, Java, and VB.Net are all programming languages that use the object-oriented programming style.

🎯 Exam Tip: Be familiar with common programming languages that primarily support the object-oriented paradigm.

 

Question 4. Paradigm means ..................
a) Organizing principle of a program
b) An approach to programming
c) Either A or B
d) None of the options
Answer: (c) Either A or B
In simple words: A 'paradigm' means a general way or approach to organize how you write a computer program, like a style or a set of rules.

🎯 Exam Tip: A paradigm describes the fundamental style and structure of a programming language, encompassing its philosophy and methods.

 

Question 5. .................. is about binding the data variables and functions together in class.
(a) Data abstraction
(b) Modularization
(c) Redundancy
(d) Encapsulation
Answer: (d) Encapsulation
In simple words: Encapsulation is the process of putting data and the actions that work on that data into a single unit, like a class, to keep them together.

🎯 Exam Tip: Remember that encapsulation is the bundling process that combines data and methods within a single unit, often a class.

 

Question 6. In .................. approach programs are organized in the form of subroutines or subprograms.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (b) Procedural Programming
In simple words: In procedural programming, programs are built from smaller parts called subroutines or subprograms, which are like mini-programs.

🎯 Exam Tip: Distinguish procedural programming by its reliance on subroutines or functions as its primary organizational units.

 

Question 7. .................. approach of the program is time-consuming.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (b) Procedural Programming
In simple words: Procedural programming can be slow and take a lot of time to fix or change, especially for larger programs.

🎯 Exam Tip: Recognize that while simple for small tasks, the global data and lack of clear structure in procedural programming can lead to time-consuming maintenance for larger projects.

 

Question 8. .................. language is based on procedural programming.
a) FORTRAN
b) COBOL
c) Both A and B
d) C++
Answer: (c) Both A and B
In simple words: Both FORTRAN and COBOL are older programming languages that follow the procedural style of programming.

🎯 Exam Tip: Be aware of classic procedural languages like FORTRAN and COBOL, which predate the widespread adoption of OOP.

 

Question 9. .................. paradigm consists of multiple modules; each module has a set of functions of related types.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (a) Modular Programming
In simple words: Modular programming breaks a program into many separate parts called modules, where each module handles related functions.

🎯 Exam Tip: The defining characteristic of modular programming is the organization of code into distinct, functional modules.

 

Question 10. In .................. approach data is hidden under the modules
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (a) Modular Programming
In simple words: In modular programming, data is often kept private inside each module, so other parts of the program cannot easily see or change it directly. This is called data hiding within modules.

🎯 Exam Tip: Modular programming supports data hiding within its modules, meaning that internal data is protected from external access, which enhances code integrity.

 

Question 11. .................. language is based on modular programming.
a) Pascal
b) C
c) Both A and B
d) C++
Answer: (c) Both A and B
In simple words: Both Pascal and C are programming languages that support and are often used for modular programming.

🎯 Exam Tip: Remember that languages like C and Pascal were early pioneers in modular programming, promoting organized code structures.

 

Question 12. .................. paradigm emphasizes the data rather than the algorithm.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: Object-Oriented Programming (OOP) focuses on the data itself and how it's structured, more than just the step-by-step instructions.

🎯 Exam Tip: The shift from process-centric to data-centric thinking is a hallmark of object-oriented programming, emphasizing data organization and protection.

 

Question 13. .................. implements programs using classes and objects.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: Object-Oriented Programming (OOP) builds programs by using 'classes' as blueprints and creating 'objects' from those blueprints.

🎯 Exam Tip: Classes and objects are the fundamental constructs that define and enable object-oriented programming.

 

Question 14. A .................. is a construct in C++ which is used to bind data and its associated function together into a single unit.
a) Class
b) Structure
c) Array
d) None of the options
Answer: (a) Class
In simple words: In C++, a 'class' is a special tool that lets you combine data and the functions that use that data into one neat package.

🎯 Exam Tip: In C++, a class is the primary construct for encapsulation, binding data and behavior together.

 

Question 15. A Class is a construct in C++ which uses the .................. concept.
a) Polymorphism
b) Encapsulation
c) Abstraction
d) Inheritance
Answer: (b) Encapsulation
In simple words: A class in C++ uses the idea of encapsulation, which means bundling data and functions that work on that data into one unit.

🎯 Exam Tip: Encapsulation is a fundamental concept directly implemented by classes to create self-contained objects.

 

Question 16. Class is a .................. data type.
a) User-defined
b) Derived
c) Primitive
d) None of the options
Answer: (a) User-defined
In simple words: A class is a data type that you, the programmer, create to fit your specific needs, rather than one that's already built into the language.

🎯 Exam Tip: Classes are powerful because they allow programmers to extend the type system with custom data structures tailored to their applications.

 

Question 17. .................. can be defined as a template or blueprint representing a group of objects that share common properties and relationship.
a) Class
b) Structure
c) Array
d) None of the options
Answer: (a) Class
In simple words: A 'class' is like a master plan or blueprint that describes what a group of similar objects will look like and how they will behave.

🎯 Exam Tip: The definition of a class as a template is crucial; it specifies the general form, while objects are the individual realizations.

 

Question 18. .................. are the basic unit of OOP.
a) Attributes
b) Objects
c) Members
d) None of the options
Answer: (b) Objects
In simple words: In Object-Oriented Programming, 'objects' are the main building blocks that make up your program.

🎯 Exam Tip: While classes provide the structure, it is the objects created from those classes that are the active, interacting components in an OOP system.

 

Question 19. The class variables are called ..................
a) Instances
b) Objects
c) Either A or B
d) None of the options
Answer: (c) Either A or B
In simple words: The variables belonging to a class are often called 'instances' or 'objects,' as they represent specific versions of the class.

🎯 Exam Tip: An object is an instance of a class, and when we talk about "class variables," we are often referring to the attributes that define the state of an object.

 

Question 20. An identifiable entity with some characteristics and behaviour is called ..................
a) Instances
b) Objects
Answer: (b) Objects
In simple words: Something you can point to, which has its own features and can do things, is called an 'object'.

🎯 Exam Tip: This definition directly points to an object, emphasizing its unique identity, specific characteristics, and active behaviors.

 

Question 21. In .................. method, programs are designed around the data being operated.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
d) All of the options
Answer: (c) Object-Oriented Programming
In simple words: In Object-Oriented Programming, programs are built with the main focus on the data and how it is structured, rather than just the sequence of actions.

🎯 Exam Tip: A key difference in OOP is its data-centric design, where data structures and their integrity are prioritized over simple procedural logic.

 

Question 22. .................. language is based on object-oriented programming.
a) C++, Java
b) VB.Net
c) Python
d) All of the options
Answer: (d) All of the options
In simple words: C++, Java, VB.Net, and Python are all programming languages that use the object-oriented approach.

🎯 Exam Tip: It's important to recognize that many popular modern languages are object-oriented, offering similar core concepts despite syntax differences.

 

Question 23. .................. is widely accepted that object-oriented programming is the most important and powerful way of creating software.
a) Modular Programming
b) Procedural Programming
c) Object-Oriented Programming
Answer: (c) Object-Oriented Programming
In simple words: Object-Oriented Programming (OOP) is generally seen as the best and most effective way to build computer software today.

🎯 Exam Tip: OOP is favored for large-scale, complex software development due to its benefits in organization, reusability, and maintenance.

 

Question 24. The Object-Oriented Programming approach mainly encourage ..................
a) Modularisation
b) Software re-use
c) Both A and B
d) None of the options
Answer: (c) Both A and B
In simple words: Object-Oriented Programming (OOP) promotes both breaking programs into smaller parts (modularization) and using existing code again (software reuse).

🎯 Exam Tip: OOP inherently supports modularity through classes and objects, which in turn facilitates software reuse by creating self-contained, interchangeable components.

 

Question 25. .................. means the program can be decomposed into modules.
a) Modularisation
b) Software re-use
c) Both A and B
d) None of the options
Answer: (a) Modularisation
In simple words: Modularization is the process of breaking a big program into smaller, easier-to-handle pieces called modules.

🎯 Exam Tip: The ability to break down a system into independent modules is fundamental to managing complexity in large programming projects.

 

Question 26. .................. means, a program can be composed of existing and new modules.
a) Modularisation
b) Software re-use
c) Both A and B
d) None of the options
Answer: (b) Software re-use
In simple words: Software reuse means building a program by putting together parts of code that already exist, along with any new parts needed.

🎯 Exam Tip: Software reuse is a major efficiency gain, leveraging previous development efforts to accelerate new projects and improve reliability.

 

Question 27. The main feature of Object-Oriented Programming is ..................
a) Data Abstraction and Encapsulation
b) Modularity
c) Inheritance and Polymorphism
d) All of the options
Answer: (d) All of the options
In simple words: All of the listed options – Data Abstraction, Encapsulation, Modularity, Inheritance, and Polymorphism – are important features of Object-Oriented Programming.

🎯 Exam Tip: The "pillars of OOP" typically include encapsulation, inheritance, polymorphism, and abstraction, all of which contribute to its power and flexibility.

 

Question 28. .................. implements abstraction.
a) Polymorphism
b) Encapsulation
c) Abstraction
d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation helps to achieve abstraction by bundling data and methods together and hiding the complex details.

🎯 Exam Tip: Encapsulation is a concrete mechanism that supports the abstract concept of hiding internal complexities.

 

Question 29. .................. can be called data binding.
a) Polymorphism
b) Encapsulation
c) Abstraction
d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation, which involves combining data and the functions that operate on it, is also known as data binding.

🎯 Exam Tip: Understand that "data binding" is another term for encapsulation, highlighting the strong connection between data and the code that manages it.

 

Question 30. .................. is the most striking feature of a class,
a) Polymorphism
b) Encapsulation
c) Abstraction
d) Inheritance
Answer: (b) Encapsulation
In simple words: Encapsulation is a very important feature of a class, because it bundles data and functions together and hides internal details.

🎯 Exam Tip: Encapsulation is fundamental to how classes organize and protect their internal components.

 

Question 31. The encapsulation of data from direct access by the program is called ..................
a) Data hiding
b) Information hiding
c) Either A or B
d) None of the options
Answer: (c) Either A or B
In simple words: When data is protected inside an encapsulated unit so it cannot be directly changed by other parts of the program, it is called either data hiding or information hiding.

🎯 Exam Tip: Data hiding and information hiding are synonymous terms that describe the protective aspect of encapsulation, preventing unauthorized external access.

 

Question 32. .................. refers to showing only the essential features without revealing background details,
a) Polymorphism
b) Encapsulation
c) Abstraction
d) Inheritance
Answer: (c) Abstraction
In simple words: Abstraction means simplifying things by only showing what's important and hiding all the complex details behind the scenes.

🎯 Exam Tip: Abstraction is about managing complexity by presenting a simplified view, which is crucial for building understandable and maintainable software.

 

Question 33. The attributes are called ..................
a) Data members
b) Methods
c) Member functions
d) Either B or C
Answer: (a) Data members
In simple words: The features or characteristics that describe an object are called its 'data members'.

🎯 Exam Tip: Attributes are the variables within a class that define the state or properties of an object; these are often referred to as data members.

 

Question 34. .................. hold information.
a) Data members
b) Methods
c) Member functions
d) Either B or C
Answer: (a) Data members
In simple words: 'Data members' are parts of a class that store information, like variables.

🎯 Exam Tip: Data members are essentially the variables that store the unique data for each instance of a class.

 

Question 35. The functions that operate on data numbers are called ..................
a) Data members
b) Methods
c) Member functions
d) Either B or C
Answer: (d) Either B or C
In simple words: The special actions or functions that work with the data inside an object are called 'methods' or 'member functions'.

🎯 Exam Tip: Remember that 'methods' and 'member functions' are interchangeable terms for the actions an object can perform or that can be performed on its data.

 

Question 36. .................. is designing a system that is divided into a set of functional units.
a) Polymorphism
b) Modularity
c) Abstraction
d) Inheritance
Answer: (b) Modularity
In simple words: Modularity means designing a system by breaking it into smaller, separate working parts.

🎯 Exam Tip: Modularity is a design principle that makes systems easier to understand, develop, and maintain by segmenting them into independent components.

 

Question 37. .................. is the technique of building new classes from an existing class,
a) Polymorphism
b) Modularity
c) Abstraction
d) Inheritance
Answer: (d) Inheritance
In simple words: Inheritance is a way to create a new class that reuses code and properties from a class that already exists.

🎯 Exam Tip: Inheritance is about creating a hierarchy where child classes (derived) acquire characteristics from parent classes (base), promoting code reuse and establishing an "is-a" relationship.

 

Question 38. In inheritance, the existing class is called as .................. class.
a) Base
b) Derived
c) Abstract
d) None of the options
Answer: (a) Base
In simple words: In inheritance, the class that already exists and from which new classes are created is called the 'base' class. It serves as the foundation.

🎯 Exam Tip: The terms "base class," "parent class," or "superclass" all refer to the original class from which others inherit.

 

Question 39. In inheritance, the newly created class is called as .................. class.
a) Base
b) Derived
c) Abstract
d) None of the options
Answer: (b) Derived
In simple words: When you use inheritance to make a new class from an old one, the new class is called a 'derived' class. It gets features from the base class.

🎯 Exam Tip: The terms "derived class," "child class," or "subclass" all refer to the new class that inherits from an existing one.

 

Question 40. .................. is the ability of a message or function to be displayed in more than one form.
a) Polymorphism
b) Modularity
c) Abstraction
d) Inheritance
Answer: (a) Polymorphism
In simple words: Polymorphism is when a single function or action can act in different ways, depending on what it is being used with.

🎯 Exam Tip: Polymorphism, meaning "many forms," allows a single interface to represent different underlying forms, crucial for flexible and extensible code.

 

Question 41. .................. means, write once and use it multiple times.
a) Re-usability
b) Redundancy
c) Security
d) None of the options
Answer: (a) Re-usability
In simple words: Re-usability means you can write a piece of code once and then use it many times in different parts of your program, without writing it again.

🎯 Exam Tip: The principle of "write once, use many times" is the direct benefit of reusability, a major advantage of OOP.

 

Question 42. If we need the same functionality in multiple class you will write a common class for the same functionality and inherit that class to subclass is called ..................
Answer: (b) Redundancy
In simple words: This process helps avoid 'redundancy' by letting you create a common class with shared features and then reusing those features in other classes through inheritance.

🎯 Exam Tip: Inheritance helps reduce redundancy by allowing shared functionality to be defined once in a base class and then reused by multiple derived classes.

 

Question 43. .................. is a good feature for data redundancy.
a) Polymorphism
b) Modularity
c) Abstraction
d) Inheritance
Answer: (d) Inheritance
In simple words: Inheritance is useful for reducing data redundancy because it lets you reuse code from existing classes instead of writing it again.

🎯 Exam Tip: Inheritance directly helps in minimizing redundant code by providing a mechanism to share common attributes and methods across a class hierarchy.

 

Question 44. .................. programs are much larger than other programs.
a) Modular
b) Procedural
c) Object-Oriented
d) All of the options
Answer: (c) Object-Oriented
In simple words: Object-Oriented Programs are generally bigger in size compared to other types of programs.

🎯 Exam Tip: Be aware that the overhead of classes and objects can sometimes make OOP programs larger in memory footprint compared to simpler programming styles.

 

Question 45. .................. program requires a lot of work to create.
a) Modular
b) Procedural
c) Object-Oriented
d) All of the options
Answer: (c) Object-Oriented
In simple words: Creating an Object-Oriented Program needs a lot of careful planning and effort because of its complex structure.

🎯 Exam Tip: The initial design and implementation phase of OOP can be demanding due to the need for proper class design and relationship modeling.

 

Question 46. .................. programs .are slower than other programs, because of their size.
a) Modular
b) Procedural
c) Object-Oriented
d) All of the options
Answer: (c) Object-Oriented
In simple words: Object-Oriented Programs can sometimes run slower because they are generally larger and have more complex internal workings.

🎯 Exam Tip: While OOP offers many benefits, performance can sometimes be a trade-off due to factors like memory usage and method dispatch overhead.

Very Short Answers 2 Marks

 

Question 1. Write a note on an object-oriented program.
Answer: Object-Oriented Programming (OOP) is a way of writing programs that uses classes and objects. This programming style lets us organize software as a group of objects. Each object combines both data (its characteristics) and behavior (what it can do). This approach helps in creating more organized and reusable code. OOP is a powerful way to manage complex software.

🎯 Exam Tip: Define OOP by emphasizing its core elements: classes, objects, and the binding of data and behavior, which leads to organized and modular software.

 

Question 2. What is modularity?
Answer: Modularity is a way of designing a system where it is broken down into smaller, separate functional units called modules. Each module performs a specific task and can be developed and tested independently. These modules can then be put together to build a larger application. This makes the system easier to understand, manage, and debug. It promotes a systematic approach to software development.

🎯 Exam Tip: Define modularity as the practice of dividing a system into independent, functional units to simplify development and maintenance.

 

Question 3. Define Data binding.
Answer: Data binding is about connecting the data variables (information) and the functions (actions) that work with that data, placing them together within a class. This process is essentially what encapsulation does. So, encapsulation is also known as data binding. It ensures that the data and its relevant operations are kept close together, improving organization and data integrity.

🎯 Exam Tip: Remember that data binding is an alternative term for encapsulation, highlighting the strong connection between data and its manipulating functions within a class.

Short Answers (3 Marks)

 

Question 1. Write about objects.
Answer: Objects represent data and the functions that go with it, all bundled into one unit. They are the most basic building block in Object-Oriented Programming (OOP). An object is essentially created from a class, which acts like its blueprint. So, objects are also called instances of a class or class variables. An object is an identifiable entity that has its own unique characteristics (data) and behavior (actions it can perform). For example, if "Car" is a class, then "myRedCar" or "yourBlueTruck" are objects, each with their own color (data) and ability to drive (behavior).

🎯 Exam Tip: Explain objects as instances of classes, emphasizing that they are identifiable entities combining data and behavior, making them the active components of an OOP system.

 

Question 2. What are Encapsulation and data binding?
Answer: Encapsulation is the way data and functions are combined into a single unit. This unit is typically a class. It is a very important feature of a class. The data inside this unit is not directly accessible from outside the program. Only the specific functions that are part of that class can access or change it. These functions provide a controlled way to interact with the object's data. This act of protecting data from direct outside access is called data hiding or information hiding. Data binding is another term for encapsulation, highlighting the strong connection between data and its associated functions within a single unit. Both terms refer to the same concept of bundling and protecting information.

🎯 Exam Tip: Clearly define encapsulation as the bundling of data and methods, and then state that data binding is another name for this process, both emphasizing data protection and organization.