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 is not a keyword in C?

volatile

extern

static

loop

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

func myFunction()

function myFunction()

void myFunction();

def myFunction()

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

Parentheses ()

Angle brackets

Brackets []

Curly braces {}

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

end()

terminate()

exit()

stop()

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

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

It stops the program

It returns success to the operating system

It sends 0 to the compiler

It initializes a variable

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

alias

typedef

struct

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

strcpy()

append()

stradd()

strcat()

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

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

if (condition) then else

if ? then : else

condition ? if : else

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

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

stdio.h

string.h

stdlib.h

math.h

12. What does the keyword extern indicate?

A variable with garbage value

A local variable

A variable defined elsewhere

A private variable

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

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

true

false

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

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

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

string name[20];

str name;

char name[20];

char name(20);

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

auto

private

static

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

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

int *p = NULL;

int *p = 0;

Both A and B

int p = NULL;

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

break

switch

for

continue

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

object

define

typedef

struct

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

Depends on the compiler

24. Which of these is a bitwise operator?

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

printf

while

scanf

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

strcpy()

strcopy()

assign()

copystr()

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

float

int

char

short

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

sizeof()

length()

strlength()

strlen()

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

*, /, +, -

+, -, *, /

*, +, /, -

/, *, -, +

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

/* */

31. Which format specifier is used for double values?

%lf

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

Function

Object

Class

Interface

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

NULL

Garbage value

34. What does the keyword static do?

Allows modification

Frees memory

Makes a variable global

Preserves the value of a variable between function calls

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

final

const

static

extern

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

0 to 255

0 to 127

-128 to 127

1 to 255

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

stdio.h

conio.h

stdlib.h

string.h

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

void fun()

declare fun()

function fun()

int = fun()

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

printf()

exit()

scanf()

malloc()

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

41. What is a pointer?

A variable that stores an address

A keyword

A data type

A compiler error

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

for

do-while

select

while

43. Which operator has the highest precedence?

()

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

const

define

macro

#define

45. What does getch() function do?

Reads a single character without echoing

Terminates the program

Compares characters

Prints a character

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

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

Constant

Array

Function

Variable

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

constant

#define

static

const int

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

"A"

'A'

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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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