CBSE Class 12 Computer Science Sample Paper 2021 Set A

CBSE Class 12 Computer Science Sample Paper 2021 Set A. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

1 Answer the following questions:

a. Explain the C++ conceptual memory map.

b. Explain the concept of this pointer

c. Is the default constructor for class Test is always Test::Test()?

d. What is constructor overloading? Support your answer with example.

2 Difference Between:

a. Static and Dynamic Memory allocation

b. ios::nocreate and ios::noreplace

c. Text and Binary File

d. get( ) and getline( )

e. Multiple and Hierarchical Inheritance

3 a) )Write the names of the header files which are not necessary to execute the following C++ code

#include<iostream.h>

#include<stdio.h>

#include<string.h>

#include<ctype.h>

#include<math.h>

void main()

{ char c, String[ ] = " System Design ";

for(int i=0; String[i]!='\0' ;i++)

if(isdigit(String[i])

cout<<endl;

else

{

c=toupper(String[i]);

cout<<c;

}

}

b) Hussain has just started working as programmer in the WORLD SOFTWARE company. In the company, he has got his first assignment to develop a small C++ module to find the smallest

number out of a given set of numbers stored in a one dimensional array. Somehow he has committed a few logical mistakes while writing this code and so he is not getting the desired result from the code. Find out the mistakes and correct this C++ code so that it provides the desired result (do not add any new statement in the code). Underline each correction made:

int SMALLFIND(int ARR,int Size) // Statement 1

{

int SMALL=ARR[1]; //Statement 2

for (int C=2;C<Size;C++) //Statement 3

if (ARR[C]>SMALL) //Statement 4

ARR[C]=SMALL; //Statement 5

return SMALL; //Statement 6

}

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