CBSE Board Class 11 Computer Science Sample Papers 2011

Sample Paper – 2011
Class – XI
Subject – Computer Science


Time Allowed: 3 Hours        Maximum Marks: 70

Instructions:
(i) All questions are compulsory.
(ii) Programming language: C++


1.(i) (1010.11)2     = (___)8          [ 1 ]
(ii) (6AF)16               = (___)2          [ 1 ]
(iii) (10111)2       = (___)10          [ 1 ]

2. Answer the following questions.        [ 1 X 5 ]
(a) What is the purpose of comments and indentation in a program ?  
(b) What do you mean by cascading of I/O operators?   
(c) What are the predefined stream objects in I/O Library ?     
(d) The modulus operator works only with integers – True or False.    
(e) What do you mean by runtime error and logical errors ?      
3.(i) Name the header files to which following built – in function belongs to.   [ 1 X 5 ]
(a) seekg( ), (b) setw( ), (c) fscanf( ), (d) strlen( ), (e) toupper( )
(ii) What will be the maximum and minimum expected outputs of the following program segments?
void main( )          [ 2 ]
{
int gn=10,fn;
fn = random(gn)+11;
cout<<fn;
}

4. (i) What do you mean by robustness ?       [ 1 ]
(ii) What are base and derived class ? How are these two interrelated ?   [ 1 ]
(iii) Explain about enum and typedef with example.      [ 1 ]
(iv) Explain briefly the concept of time sharing.       [ 1 ]
(v) What is a shortcut menu? What is its significance ?     [ 1 ]
 
5.(a) Write about the different types of printer ?       [ 2 ]
(b) What is the difference between RAM and ROM ?      [ 2 ]
(c) What is the function of memory ? What are its measuring units ?    [ 2 ]
(d) Mention the steps you would follow while writing a program ?    [ 2 ]
(e) What are the characteristics of a good program ?      [ 2 ] 

6. What will be the output of the following program.      [ 3 X 5]
(a) void result(int &x, int y=10)         
{
int temp = x + y;
x + = temp;
if(y <=10)
y + = temp;
}
void main( )
{
int A1=10, B2=5;
result(A1, B2);
cout<<A1<<B2<<endl;
result(A1);
cout<<A1<<B2<<endl;
result(B2);
cout<<A1<<B2<<endl;
}

(b) What will be the output of the following program segment.
#include <iostream.h>
void main( )
{ int i = 0, x = 0;
do
{ if(i % 5 = = 0)
    { cout<<x;
       x++;
    }
  ++ i;
}while(i<10);
cout<<”\n”<<x;
}

(c) What will be the output of the following program segment.
void withdef(int hisnum = 30)         
{
for(int i=20 ; i<=hisnum ; i+=3)
cout<<i<<” “;
cout<<endl;
}
void control(int &mynum)
{
mynum + = 5;
withdef(mynum);
}
void main( )
{
int yournum = 10;
control(yournum);
withdef( );
control(yournum);
}
(d)Write the output of the following program.     
#include <iostream.h>
void main()
{ int x = 5;
if(x++ = = 5)
cout<<”five”<<endl;
else
if(++x = = 6)
cout<<”Six”<<endl;
}
(e)What will be the output of the following segment ?    
struct number
{
int no1, no2;
};
void display(number n)
{
cout<<”Number1=”<<n.no1++<<”Number2=”<< - -n.no2<<endl;
}
void main( )
{
number n1={10,100}, n2, n3;
n3 = n1;
n1.no1 + = 5;
n2 = n3;
n2.no1 - = 5;
n2.no2 * = 2;
n3.no1 + = 1;
display(n1);
display(n2);
display(n3);
}





7. Correct the errors, if any, and underline it in the following program.   [2 X 3]
(a)
structure
   {
   char name[20];
   char destination[10];
   };
void main()
{
employ e={27,”PGT”};
cout<<employ.name;
cout<<destination;
}
(b) #include <iostream.h>
void main( )
{ int x[5], y, z[5];
for(i= 0; i<5; i++)
{ x[i]=i;
z[i]=i+3;
y=z;
x=y;
}
}
(c) Rewrite the following by correcting the syntax errors.(Underline each correction)  
include <iostream.h>
void main( )
{
int sum; value;
for(i=0; i<=10; i++)
cin>>value;
sum = + value;
}



8.(a) Write the output for the following program code fragment.    [ 1 ]
for(i= -3, sum=0; i<11; i++) sum++;
cout<<sum;
(b) Declare a structure student with following members.     [ 1 ]
an integer member called roll, a floating member called marks and a character member
called grade.
(c) How many times the following loop will execute and what will be the output.  [ 2 ]
int a=1;
while(++a<=10)
                 cout<<a++<<”\t”;




9. (a) Write a C++ program that invokes a function calc( ) which takes two integers and an arithmetic operator and prints the corresponding result.       [ 2 ]
(b) Write a program to check a number whether it is prime or not.    [ 2 ]
(c) Write a function sumfun( ) to find the sum of following series. The function should accept two arguments long n and int x and return a double type result.       [ 3 ]
1 + x/2! + x2/3! + x3/4! + . . . . . . . . .+ xn/(n+1)! 
(d) Write a program using function to display the multiplication values of column elements of a two-dimensional array R[7][7] containing integers.       [ 2 ]
(e) Write a program to accept the name and total marks of 10 students to an array of structure. Display the names of the student securing highest and lowest mark.     [ 3 ]
(f) Write a function to arrange all the elements in descending order which are present in 1st row and last row of a matrix of order m X n.         [ 3 ]