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Computer Elements of “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

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

function fun()

int = fun()

void fun()

declare fun()

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

string name[20];

char name[20];

char name(20);

str name;

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

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

false

true

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

NULL

Garbage value

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

private

auto

static

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

extern

static

final

const

8. What does the keyword static do?

Frees memory

Makes a variable global

Preserves the value of a variable between function calls

Allows modification

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

select

for

do-while

while

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

Depends on the compiler

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

Object

Function

Interface

Class

12. Which of these is a bitwise operator?

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

Brackets []

Parentheses ()

Angle brackets

Curly braces {}

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

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

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

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

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

stdio.h

math.h

stdlib.h

string.h

19. Which format specifier is used for double values?

%lf

20. What does the keyword extern indicate?

A local variable

A private variable

A variable defined elsewhere

A variable with garbage value

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

struct

alias

typedef

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

#define

const

macro

define

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

#define

static

const int

constant

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

func myFunction()

function myFunction()

void myFunction();

def myFunction()

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

int

float

short

char

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

27. Which operator has the highest precedence?

()

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

29. What is a pointer?

A data type

A keyword

A variable that stores an address

A compiler error

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

copystr()

assign()

strcpy()

strcopy()

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

/* */

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

for

break

continue

switch

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

object

typedef

struct

define

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

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

if ? then : else

condition ? if : else

if (condition) then else

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

sizeof()

strlen()

strlength()

length()

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

Both A and B

int p = NULL;

int *p = 0;

int *p = NULL;

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

strcpy()

strcat()

append()

stradd()

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

Function

Array

Constant

Variable

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

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

0 to 255

0 to 127

1 to 255

-128 to 127

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

printf()

scanf()

exit()

malloc()

42. What does getch() function do?

Compares characters

Terminates the program

Reads a single character without echoing

Prints a character

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

+, -, *, /

*, +, /, -

/, *, -, +

*, /, +, -

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

scanf

while

printf

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

extern

static

volatile

loop

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

terminate()

end()

stop()

exit()

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

It initializes a variable

It returns success to the operating system

It stops the program

It sends 0 to the compiler

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

conio.h

string.h

stdlib.h

stdio.h

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

'A'

"A"

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Mustansar KhanLast Updated: October 15, 2025

Computer Elements of “C” Test Online

Important Computer Elements of “C” Question and Answer

Elements of “C” Practice Test Online With Explanation

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