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Computer Elements of “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

Start your preparation for Computer Elements of “C” Test Online. This online test contains important MCQs from past papers. Attempting this test will help you prepare for Annual Exams and Entry Tests. Read the questions carefully and select the correct option below to see your result.

Important Computer Elements of “C” Question and Answer

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Elements of “C” Practice Test Online With Explanation

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Page 1 of 2

1. What does the keyword extern indicate?

A variable defined elsewhere

A variable with garbage value

A local variable

A private variable

2. Which operator is used to increment a value by 1?

3. Which of the following is not a looping structure in C?

while

for

do-while

select

4. What is the output of printf("%d", 3 == 3);?

true

false

5. Which of the following is a compound assignment operator?

6. Which of the following is an example of a looping construct?

switch

break

continue

for

7. What is a pointer?

A data type

A variable that stores an address

A keyword

A compiler error

8. Which of the following is the correct syntax to declare a string?

str name;

char name(20);

string name[20];

char name[20];

9. What is the output of: printf("%d", sizeof(5.5));?

Depends on the compiler

10. Which of the following is a valid arithmetic operator in C?

11. Which header file includes the strlen() function?

string.h

stdlib.h

math.h

stdio.h

12. Which keyword is used to prevent a variable from being modified?

static

final

const

extern

13. Which function is used to find the length of a string?

strlength()

length()

strlen()

sizeof()

14. Which keyword is used to define a structure in C?

typedef

struct

object

define

15. What is the correct way to initialize a pointer to NULL?

int *p = NULL;

Both A and B

int *p = 0;

int p = NULL;

16. What is the correct syntax for a ternary operator in C?

condition ? if : else

(condition) ? (true value) : (false value)

if ? then : else

if (condition) then else

17. Which of the following can be used to copy strings in C?

strcpy()

assign()

copystr()

strcopy()

18. Which keyword is used to define a user-defined data type alias?

alias

struct

typedef

19. What does the keyword static do?

Makes a variable global

Frees memory

Allows modification

Preserves the value of a variable between function calls

20. Which data type can be used to store a decimal number?

short

float

int

char

21. What does getch() function do?

Compares characters

Reads a single character without echoing

Terminates the program

Prints a character

22. Which of the following is used for dynamic memory allocation?

exit()

printf()

scanf()

malloc()

23. Which of these is a decision-making structure in C?

while

scanf

printf

24. What is the default value of a global variable in C?

Garbage value

NULL

25. Which of the following functions is used to concatenate two strings?

stradd()

append()

strcat()

strcpy()

Page 2 of 2

26. Which of these is a bitwise operator?

27. Which of the following is used to terminate a C program?

terminate()

exit()

stop()

end()

28. What is the function of return 0; in main()?

It sends 0 to the compiler

It initializes a variable

It returns success to the operating system

It stops the program

29. Which of the following is a fundamental element of a C program?

Object

Function

Interface

Class

30. Which of these is not a storage class in C?

private

auto

static

31. Which of the following is not a keyword in C?

extern

static

volatile

loop

32. Which operator has the highest precedence?

()

33. What is the keyword used to define a macro?

#define

macro

const

define

34. Which symbol is used to begin a preprocessor directive?

35. Which operator is used to compare if two values are not equal?

36. Which library must be included to use malloc()?

stdio.h

conio.h

stdlib.h

string.h

37. Which operator is used to access the value stored at an address?

38. Which of the following is used to store a group of related values?

Array

Variable

Function

Constant

39. Which of the following function declarations is valid in C?

int = fun()

declare fun()

void fun()

function fun()

40. What will be the output of sizeof(char) on most systems?

41. Which of the following is used to define a symbolic constant in C?

const int

constant

static

#define

42. What will the statement int a = 10, b = 3; printf("%d", a % b); print?

43. Which of the following is a valid character constant in C?

"A"

'A'

44. What is the range of values for a char in C?

-128 to 127

0 to 127

1 to 255

0 to 255

45. Which format specifier is used for double values?

%lf

46. Which is the correct declaration of a function in C?

def myFunction()

void myFunction();

function myFunction()

func myFunction()

47. Which of the following is used to define a block of code in C?

Parentheses ()

Angle brackets

Brackets []

Curly braces {}

48. Which of the following is used to create a multi-line comment in C?

/* */

49. Which of the following is the correct order of evaluation?

*, +, /, -

+, -, *, /

/, *, -, +

*, /, +, -

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Mustansar KhanLast Updated: October 15, 2025

Important Computer Elements of “C” Question and Answer

Elements of “C” Practice Test Online With Explanation

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