West Bengal Board Class 11 Computer Science Sample Papers 2012

Class 11
Sample Paper Of Computer Science

General Instructions:

1. All Questions are compulsory.

2. Programming Language is C++.

1.i) State the basic units of the computer and give function of each of the unit 2

ii) What is difference between interpreter and complier? 2

iii) Explain briefly the major innovations in generations of computer. 3

iv) write short on booting process 2

v) Expand the following: BIOS, ASCII 1

2 .i) Define operating system ?Give the 2 examples of operating systems 2

ii) What are the functions of the operating system? 3

iii) Write the 4- examples of DOS commands. 2

iv)Explain the different types of Operating Systems 3

3.i) What are the difference between a keyword and an identifier? 2

ii) How will you include comments in c++? How many types of comments are there in c++ language? 2

iii) Why include iostream.h in c++ programming 2

iv) What do you mean by cascading ?.Give the examples. 2

v) What are the differences between syntax and runtime errors? Give example. 2

4.i) Write a short notes on Fundamental data types . 3

ii) What is type coasting ? Explain with example. 2

iii) Distinguish between a unary, binary and a ternary operator. Give example of c++ operators for each one of them. 3

iv) Write the equivalent C++ expression for the following expressions: 2

a) b) p+q/(r+s)4

5.i) Define Flow chart and Algorithm . 2

ii) Draw a flowchart that picks the largest of three given numbers 3

iii) Write an algorithm to find whether a given number is odd or even 3

iv) Draw the symbol used in the flow chart for connector and

comments(annotations) 2

6.i) Name the header files required for successful execution of a program that uses the following components: 1

i) getch() ii) ceil( )

ii) Write a program in C++ to accept marks in five subjects for a student and display the average mark. 3

iii) Write a program in c++ to convert temperature in Celcious to Fahrenheit? 3

iv) What will be the output of the following code fragment? 3

.

.

.

int year;

cin>> year;

if((year % 100= =0) && (year%400= =0))

{

cout<<”Leap”;

}

else

cout<<” Not a century year.

If the input given is

i) 2000

ii) 1900

iii) 1971

7.i) Predict and correct the logical error present in the following code fragment: 1

if(k=1)

cout<<”ONE”;

else

cout<<” NOT ONE”;

ii) Write a program to calculate the area of a circle or triangle or rectangle according to the choice given by the user. 3

iii) Write a program to print whether a given character is an uppercase or lowercase or a digit or any other character. Use ASCII for it .The ASCII codes are as given below : 4

Characters ASCII range

‘ o’ – ‘9’ 48 – 57

‘A’ – ‘Z’ 65 – 90

‘a’ – ‘z’ 97 – 122

Other characters 0 – 125 excluding the above mentioned

Codes

iv) Convert the following conditional statement into its equivalent if-else statement.

N=((a<b)?a:b); 2