COMPUTER- Question Bank

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ECS-101, Computer Concepts & Programming in CQUESTION BANK

UNIT IOBJECTIVE QUESTIONS

1. A Compiler is ____

a combination of computer hardware

a program which translates from one high-level language to another

a program which translates from one high-level to a machine level

None of these

2. When a key is pressed on the keyboard, which standard is used for converting the keystroke into the corresponding bits

ANSI ASCII EBCDIC ISO

3. A Pixel is

A computer program that draws picture

A picture stored in secondary memory

The smallest resolvable part of a picture

None of these

4. Which device is used as the standard pointing device in a Graphical User Environment

Keyboard Mouse Joystick Track ball

5. Which number system is usually followed in a typical 32-bit computer?

2 10 16 32

6. Which of the following is not an output device?

Scanner Printer Flat Screen Touch Screen

7. Which of the following devices have a limitation that we can only information to it but cannot erase or modify it

Floppy Disk Hard Disk Tape Drive CDROM

8. Which technology is used in Compact disks?

Mechanical Electrical Electro Magnetic Laser

9. Which of the following storage devices can store maximum amount of data?

Floppy Disk Hard Disk Compact Disk Magneto Optic

Disk

10. The programs which are as permanent as hardware and stored in ROM is known as

Hardware Software Firmware ROMware

11. Memory is made up of

Set of wires Set of circuits Large number of

cells All of these

12. Primary memory stores

Data alone Programs alone Results alone All of these

13. EPROM can be used for

Erasing the contents of ROM

Reconstructing the contents of ROM

Erasing and reconstructing the contents of ROM

Duplicating ROM

14. Which device can understand difference between data & programs?

Input device Output device Memory Microprocessor

15. The contents of information are stored in

Memory data register

Memory address register

Memory access register

Memory arithmetic register

16. Memory unit is one part of

Input device Control unit Output device Central Processing

Unit

17. Algorithm and Flow chart help us to

Know the memory capacity

Identify the base of a number system

Direct the output to a printer

Specify the problem completely and clearly

18. Which of the following is not a valid size of a Floppy Disk?

8" 5 1/4"

19. C is a ___ language

High Level Low Level Middle Level Machine Level

20. C language is available for which of the following Operating Systems?

DOS Windows Unix All of these

UNIT ISHORT QUESTIONS

1. To which numbering system can the binary number 1101100100111100 be easily

converted?

2. Draw a flowchart to find the greatest of three numbers.

3. What is structured programming? Explain.

4. What do you mean by programming environment, name few C compilers.

5. Explain the importance of an operating system?

UNIT ILONG QUESTIONS

1. Differentiate between different number systems. How a binary number is converted

into a decimal number? Explain.

2. How flowcharts are different from algorithms, show with an example.

3. What is a digital computer? Explain its parts.

4. What do you understand by top down development of programs and stepwise

refinement?

5. Why C is called Middle level language? Explain.

UNIT IIOBJECTIVE QUESTIONS

1. Which of the following is a Scalar Data type

Float Union Array Pointer

2. Which of the following are tokens in C?

Keywords Variables Constants All of the above

3. What is the valid range of numbers for int type of data?

0 to 256 -32768 to +32767 -65536 to +65536 No specific range

4. Which symbol is used as a statement terminator in C?

! # ~ ;

5. Which escape character can be used to begin a new line in C?

\a \b \m \n

6. Which escape character can be used to beep from speaker in C?

\a \b \m \n

7. Character constants should be enclosed between ___

Single quotes Double quotes Both a and b None of these

8. String constants should be enclosed between ___

Single quotes Double quotes Both a and b None of these

9. Which of the following is invalid?

‘’ “ “ ‘a’ ‘abc’

10. The maximum length of a variable in C is ___

8 16 32 64

11. What will be the maximum size of a float variable?

1 byte 2 bytes 4 bytes 8 bytes

12. What will be the maximum size of a double variable?

1 byte 4 bytes 8 bytes 16 bytes

13. A declaration float a,b; occupies ___ of memory

1 byte 4 bytes 8 bytes 16 bytes

14. The size of a String variable is

1 byte 8 bytes 16 bytes None of these

15. Which of the following is an example of compounded assignment statement?

a = 5 a += 5 a = b = c a = b

16. The operator && is an example for ___ operator.

Assignment Increment Logical Rational

17. The operator & is used for

Bitwise AND Bitwise OR Logical AND Logical OR

18. The operator / can be applied to

integer values float values double values All of these

19. The equality operator is represented by

:= .EQ. = ==

20. Operators have hierarchy. It is used to know which operator

is most important is used first is faster operates on large

numbers

21. The bitwise AND operator is used for

Masking Comparison Division Shifting bits

22. The bitwise OR operator is used to

set the desired bits to 1

set the desired bits to 0

divide numbers multiply numbers

23. Which of the following operator has the highest precedence?

* == => +

24. The associativity of ! operator is

Right to Left Left to Right (a) for Arithmetic

and (b) for Relational (a) for Relational

and (b) for Arithmetic

25. Which operator has the lowest priority?

++ % + ||

26. Which operator has the highest priority?

++ % + ||

27. Operators have precedence. A Precedence determines which operator is

faster takes less memory evaluated first takes no

arguments

28. Integer Division results in

Rounding the fractional part

truncating the fractional part

Floating value An Error is

generated

29. Which of the following is a ternary operator?

? * sizeof ^

30. What will be the output of the expression 11 ^ 5?

5 6 11 None of these

31. The type cast operator is

(type) cast() // " "

32. Explicit type conversion is known as

Casting Conversion Disjunction Separation

33. The operator + in a+=4 means

a = a + 4 a + 4 = a a = 4 a = 4 + 4

34. p++ executes faster than p+1 because

p uses registers p++ is a single

instruction ++ is faster than

+ None of these

UNIT IISHORT QUESTIONS

1. Write a program to compute the addition, subtraction, product, quotient and remainder of two given numbers.

2. Write a program to compute the average of three given numbers3. Write a program to compute simple interest and compound interest from the given

principal, time period and interest rate.4. Write a program to compute the area of a circle from the given radius.

Hint: - Area of the circle=3.14 x (radius) 2.5. Write a program to swap the values of two variables.

UNIT IILONG QUESTIONS

1. What does static variable mean?2. Explain the difference between printf statement and scanf statements.3. What does the storage classes refer in ‘C’ language? 4. What are operators and expressions? Explain various types of operators used in C.5. Differentiate between Data Types and Storage Classes? Classify different datatypes.

UNIT IIIOBJECTIVE QUESTIONS

1 What will be the output of the following program?main() { int i=1,j,k;if(i>=2)j=2;k=3;printf(“\n%d%d”,j,k);

}A) 2,3B) 0,0C) 0,3D) 3,2

2 Which of the following keyword is used to jump out of a loop without waiting to get back to the conditional test?A) breakB) continueC) whileD) exit

3 Pick up the odd one out from the following.A) a=a+1;B) a+=1;C) a++;D) a=+1;

4 In the for statement : for (exp1; exp2; exp3 ) { ……..}where exp1, exp2 and exp3 are expressions. What is/are optional?

A) None of the expressions are optional.B) Only exp1 and exp3 are optional.C) Only exp1 is optionalD) All the expressions are optional.

5 Which of the following is false for goto statement?

A) Use of the goto statement should generally be avoided.B) A goto statement transfers the control to a labeled statement.C) No two statements in a function can have same label.D) With a goto statement, the control can be transferred to any statement of other

program.

6 The output of the following code segment will bechar x = ‘B’;switch ( x ) {

case ‘A’ : printf(“a”);case ‘B’ : printf(“b”);case ‘C’ : printf(“c”);

}

A) BB) bC) BCD) bc

7 How many times following loop will be executed?for(a = 0; a < 14 ; a++)printf(“hello\n”);A) 15B) 13C) 14D) infinite

8 What is the output of the following code:b = ++c + ++ c; if c is 10 initiallyA) 20B) 23C) 24D) 22

9 The goto statement causes control to go toA) an operatorB) a labelC) a variableD) a function

10. void main(){int i=0;for( ; i; )print”there is some mail for you”);}A. no output B. infinite loop C. there is….

D. error

11. C supports how many basic looping constructs

2 3 4 6

12. What should be the expression return value for a do-while to terminate

1 0 -1 NULL

13. Which among the following is a unconditional control structure

do-while if-else goto for

14. continue statement is used

to go to the next iteration in a loop

come out of a loop exit and return to

the main function restarts iterations

from beginning of loop

15. The continue command cannot be used with

for switch do while

16#include<stdio.h>void main(){float a=0.7;if(0.7>a)printf(“Hi ”);elseprintf(“Hello ”);}a ] Hi b ] Hello c ]Hi Hello d ] None of the above

17#include<stdio.h>void main(){extern int i;i=20;printf(“%d ”,sizeof(i));}a ] 2 b ] 4 c ] Cannot be said d ] None of the above

18#include<stdio.h>void main(){int i=5.99999;printf(“%d ”,i);}a ] 6 b ] 5 c ] Error cannot assign float to integerd ] None of the above

19 #include<std o.h>

void main(){int i=1;if(!i)printf(“recursive calls are painful \n ”);else{i=0;printf(“recursive calls are challenging \n ”);main();}}a ] recursive calls are challengingrecursive calls are painfulb ] recursive calls are painfulrecursive calls are challengingc ] recursive calls are painfuld ] recursive calls are challenging (infinitely.....)20#include<std o.h>void main(){printf(“%d ”,main());}a ] prints garbage value infinitelyb ] it runs an infinite loop without printing anythingc ] compiler reports an error since main cannot be called recursivelyd ] address of main gets printed infinitely

UNIT IIISHORT QUESTIONS

1. Write a program to compute net amount from the given quantity purchased and rate per quantity. Discount @10% is allowed if quantity purchased exceeds 100.Net Amount = (Quantity Purchased x Rate Per Quantity) – Discount.

2. Write a program to find out a person is insured or not. The person is insured if following conditions are satisfied: -

i) If the person is married.ii) If the person is unmarried, male & above 30 years of age.iii) If the person is unmarried, female & above 25 years of age.

In all other cases the person is not insured.

3. Write a program to compute the division from the given marks of 5 subjects. The division can be calculated as follows: -

Average Mark Division>=60 First>=50 Second>=40 Third<40 Fail

4. Write a program to ask the user to enter a series of marks of a student. If the user enters –1, come out of the loop and print the average mark.

5. Write a program to print the sum of digit of a given number.

6. Write a program to print “Hello World” in the main function and “Welcome To C” in another function.

UNIT IIILONG QUESTIONS

1. What is recursion?

2. Differentiate between a for loop and a while loop? What are it uses?

3. Explain multi way decision statements with examples.

4. Differentiate between while and do-while loop.

5. How recursion is different then other functions? Explain.

UNIT IVOBJECTIVE QUESTIONS

1. A multidimensional array can be expressed in terms of

array of pointers rather than as pointers to a group of contiguous array

array without the group of contiguous array

data type arrays None of these

2. C allows arrays of greater than two dimensions, who will determined this

programmer compiler parameter None of these

3. A pointer to a pointer in a form of

multiple indirection

a chain of pointers both a and b None of these

4. Pointers are of

integer data type character data

type unsigned integer

data types None of these

5. Maximum number of elements in the array declaration int a[5][8] is

28 32 35 40

6. If the size of the array is less than the number of initializers then,

Extra values are being ignored

Generates an error message

Size of Array is increased

Size is neglected when values are given

7. Array subscripts in C always start at

-1 1 0 Value provided by

user

8. A Structure

can be read as a single entity

cannot be read as a single entity

can be displayed as a single entity

has member variables that cannot be read individually

9. Identify the invalid pointer arithmetic

Addition of float value to a pointer

Comparision of pointers that do not point to the element of the same array

Subtracting an integer from a pointer

Assigning the value 0 to a pointer variable

10. In C, a Union is

memory location memory store memory screen None of these

11#include<stdio.h>void main(){union a{int i;char ch [2 ];};union a u;u.ch [0 ]=3;u.ch [1 ]=2;printf(“%d ”,u.i);}a ] 515 b ] 770 c ] 0 d ] Error:u.i is uninitialized

12Assume that variable x resides at memory location 100, y at 200 and ip at 1000.

int x=1; y=2; int *ip;ip=&xy=*ip

What will be the value of y after execution of above code?A) 1B) 2C) 100D) 1000

13Which of the following is the correct way of declaring an array of integer pointers?A) int *arr[10];B) int arr[10];C) *int arr[10];D) int *arr;

14Consider the following code segment

int a[10], *p1, *p2;p1 = &a[4];p2 = &a[6[;

Which of the following is incorrect w.r.t pointers?

A) p1 +2B) p2 - 2C) p2 - p1D) p2 +p1

15

Which variable type holds at a common assigned area different data types of varying sizes at different points in time?A) structB) unionC) enumD) none of the above

16.void main(){struct test{char ch;int data;float f;}printf(“%d”,sizeof(struct test));}a. 7 b. can’t predict c. error d. none of the above

17.void main(){int a[5];a[0]=0;if(a[0]++)print(“forget me”);elseprint(“miss me”);}a. forget me b. miss me c. error d. none of the above

18. void main(){printf(“It is a small world after all”);main();}a. print one time b. print infinite c. print nothing d. error

19. void main(){int i=5, j=2;fun(i,&j)printf(“\n%d %d”,i,j);}void fun(int i, int *j){i=i*i;*j=(*j) * (*j);}

20. void main(){int m[2];int *p=m;m[0]=100;m[1]=200;printf(“\n %d%d”,++*p,*p);}a. 101100 C 100101 c. 101101 d. 100100UNIT IVSHORT QUESTIONS

1. Write a program to create an array. Print the highest and lowest number in the array.2. Write a program to create two matrixes. Multiply the values of the two matrixes and

store it in another matrix. Display the new matrix.3. Write a program to check if a given string is palindrome or not. A string is said to be

palindrome if the reverse of the string is equal to the string.4. Write a program to find the maximum number within n given numbers using pointers.5. Write a program to create a book structure having name, author, page and price.

UNIT IVLONG QUESTIONS

1. Write down the equivalent pointer __expression for referring the same element a[i][j][k][l]?

2. What is difference between Structure and Unions? 3. What the advantages of using Unions? 4. What are the advantages of using pointers in a program? 5. What is the difference between Strings and Arrays?

UNIT VOBJECTIVE QUESTIONS

1. Which of the following statements is true?

C Library functions provide I/O facilities

C inherent I/O facilities C doesn’t have I/O facilities

Both (a) and (c)

2. Header files in C contain

Compiler commands

Library functions Header

information of C programs

Operators for files

3. Which pair of functions below are used for single character I/O.

Getchar() and putchar()

Scanf() and printf()

Input() and output()

None of these

4. The printf() function retunes which value when an error occurs?

Positive value Zero Negative value None of these

5. Identify the wrong statement

putchar(65) putchar('x') putchar("x") putchar('\n')

6. Which of the following is charecter oriented console I/O function?

getchar() and putchar()

gets() and puts() scanf() and printf() fgets() and fputs()

7. The output of printf("%u", -1) is

-1 minimum int value maxium int value Error message

8. An Ampersand before the name of a variable denotes

Actual Value Variable Name Address Data Type

9. Symbolic constants can be defined using

# define const symbols None of these

10. Null character is represented by

\n \0 \o \e

11. Which header file is essential for using strcmp() function?

string.h strings.h text.h strcmp.h

12. malloc() function used in dynamic allocation is available in which header file?

stdio.h stdlib.h conio.h mem.h

13. File manipulation functions in C are available in which header file?

streams.h stdio.h stdlib.h files.h

14. Which of the following header file is required for strcpy() function?

string.h strings.h files.h strcpy()

15. which of the following is not a header file in C?

string.h strings.h stdbook.h strcpy()

16 #include<stdio.h>#define SWAP(a,b,c)(c t;t=a,a=b,b=t;)void main(){int x=10,y=20;SWAP(x,y,int);printf(“%d %d ”,x,y);}

17 #include<stdio.h>#define MAX(a,b,c)(a>b?a>c?a:c:b>c?b:c)/*?:has right to leftassociativity */void main(){int x;x=MAX(3+2,2+7,3+7);printf(“%d ”,x);}a ] 5b ]9c ]10d ]3+7

18Which of the following is returned by the function ‘strcmp’ if the strings that are compared are identical?

A) 0B) 1C) 2D) true

19The statement that defines an input file handle called input_file, which is a pointer to type FILE, is:

A) FILE*input_file;B) type input _file as FILE;C) input_file FILE;D) *FILE input_file;

20Close the file associated with input_file

A) close input_file;B) fclose(input_files);C) fcloseall();D) input_file(fclose);

UNIT VSHORT QUESTIONS

1. Write a program which uses Command Line Arguments

2. Write a program which uses functions like strcmp(), strcpy()? etc

3. Write a program to sort an array using Bubble Sort Algorithm.

4. Write a program to search a key number in an array using Sequential Search Methd.

5. Write a program to read a text file print it on the screen.

UNIT VLONG QUESTIONS

1. What are macros? what are its advantages and disadvantages?

2. In a header file whether functions are declared or defined?

3. Are the variables argc and argv are local to main?

4. What do the functionsatoi(), itoa() and gcvt() do?

5. Can you use the function fprintf() to display the output on the screen?