Official Class 4 Computers Revision Material: CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02
Access comprehensive revision notes for Evolution of Computers using the CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02. Designed to align with the 2026-27 academic syllabus for Class 4 Computers, these concept summaries help students streamline their exam preparation and review complex topics efficiently.
Chapter-wise Concept Summaries: Evolution of Computers
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Evolution of Computing Devices
| Device | Inventor and year | Features |
|---|---|---|
| Abacus | Egyptians, later developed by Chinese and Japanese (about 3000 BC) | Wooden frame with rods and beads; first mechanical calculating device |
| Napier's Bones | John Napier, 1617 | Bones placed side by side for multiplication and division; introduced the decimal point |
| Pascaline | Blaise Pascal, 1642 | Wheels and gears; could add and subtract; first calculator |
| Jacquard Loom | Joseph Jacquard, 1801-05 | Used punched cards to control weaving needles; showed how to store information on cards |
| Difference Engine | Charles Babbage, 1822 | Designed to make mathematical tables; could not be built properly |
| Analytical Engine | Charles Babbage, 1833-34 | Steam powered; first automatic general-purpose computing device; Babbage is the 'Father of Computer' |
| ENIAC | Moore School, USA, 1943 | First valve-based electronic computer; about 19,000 vacuum tubes; needed 800 sq ft of space |
Lady Ada Lovelace is known as the world's first programmer. The programming language ADA is named after her.
Characteristics of a Computer
| Characteristic | Meaning |
|---|---|
| Speed | Processes millions of instructions in a second; measured in MIPS (Million Instructions Per Second) |
| Diligence | Never gets tired; works for hours unless there is a technical fault |
| Versatility | Does many kinds of jobs and produces audio, video and text |
| Accuracy | Does not make mistakes; works exactly as instructed |
| High storage capacity | Stores huge data in a very small space |
| Secrecy | Acts like a safe vault; unauthorised users cannot access data |
| Calculative | Does arithmetic and logical calculations |
Limitations
A computer cannot think on its own and must be instructed by the user. It has no feelings, cannot learn from past experience and needs to be configured for every task.
Uses of Computers
| Place | Use |
|---|---|
| School | Fee collection, result preparation, digital classrooms |
| Hospital | Diagnosing diseases, keeping patient records |
| Business | Writing letters, maintaining accounts |
| Railways | Booking tickets, showing train information |
| Police station | Tracking criminals, viewing records |
| Defence | Tracking missiles, mapping and plotting |
| Bank | Customer accounts, banking records, financial statements |
| Recreation | Film special effects, video games, TV broadcast |
| Science and research | Making robots, weather forecasting, launching satellites |
| Publishing | Designing books and newspapers |
Input, Processing and Output Devices
| Type | Device | Function |
|---|---|---|
| Input | Keyboard | Has alphabet, number, function (F1-F12), character and special keys; used to type data |
| Input | Mouse | Hand-held pointing device with two buttons and a scroll wheel; an optical mouse uses a sensor |
| Input | Joystick | Pointing device with a handle moved in four directions; used to play games |
| Input | Scanner | Converts a picture or text into a digital image |
| Input | Barcode reader | Reads barcodes at billing counters |
| Processing | CPU | Processes the data; the 'brain of the computer' |
| Output | Monitor (VDU) | Shows the output. Types: CRT, LCD, LED |
| Output | Printer | Prints the result on paper (hard copy) |
CRT monitors are bulky, use more power and tire the eyes more than TFT (LCD and LED) monitors, which give better picture quality.
Questions and Answers
1. Fill in the blanks: (a) The speed of a computer is measured in ___. (b) Unorganised information is called ___. (c) The Analytical Engine worked with ___ power. (d) ___ is known as the Father of Computer.
Show answer
Answer: (a) MIPS (b) data (c) steam (d) Charles Babbage
Teacher's Note: Use the key term in your answer.
2. Match the inventors: Abacus, Napier's Bones, Adding Machine, Difference Engine, Punched Card.
Show answer
Answer: Abacus - Egyptians; Napier's Bones - John Napier; Adding Machine - Blaise Pascal; Difference Engine - Charles Babbage; Punched Card - Joseph J. Jacquard.
Teacher's Note: Give an example if the question allows.
3. Name the first: calculating device, electronic computer, programmer, use of punched cards.
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Answer: Abacus; ENIAC; Lady Ada Lovelace; the Jacquard loom.
Teacher's Note: Write a short, clear answer.
4. Justify: Computer is an accurate machine.
Show answer
Answer: A computer never makes mistakes and works exactly according to the instructions given. Errors in the input can be detected and corrected.
Teacher's Note: Remember this for your exam.
5. List the limitations of a computer.
Show answer
Answer: It cannot think on its own, has no feelings, and cannot learn from experience.
Teacher's Note: Learn this point and write it in your own words.
6. How does a computer act like a safe vault?
Show answer
Answer: It stores important information that unauthorised users cannot access.
Teacher's Note: Use the key term in your answer.
7. List five input devices.
Show answer
Answer: Keyboard, mouse, joystick, scanner and barcode reader.
Teacher's Note: Give an example if the question allows.
8. Write the function of a joystick and a printer.
Show answer
Answer: A joystick is used to play games; its handle moves objects across the screen. A printer prints the result on paper to give a hard copy.
Teacher's Note: Write a short, clear answer.
9. Aditya took snaps on a trip and his father transferred them to the computer. Which device prints the snaps? Which device is used to see them? Which device is used to type comments?
Show answer
Answer: Printer; monitor; keyboard.
Teacher's Note: Remember this for your exam.
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FAQs
You can download the teacher prepared revision notes for CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02 from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Class 4 students get the best study material for Computers.
Yes, our CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02 include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Computers principles which is important for getting more marks in 2026 CBSE exams.
Yes, our CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02 provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 4 is covered.
These notes for Computers are organized into bullet points and easy-to-read charts. By using CBSE Class 4 Computers Evolution of Computer Notes with Questions Set 02, Class 4 students fast revise formulas, key definitions before the exams.
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