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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.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

Elements of “C” Practice Test Online With Explanation

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Page 1 of 2

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

Brackets []

Parentheses ()

Angle brackets

Curly braces {}

2. What does the keyword extern indicate?

A local variable

A private variable

A variable with garbage value

A variable defined elsewhere

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

char name(20);

str name;

char name[20];

string name[20];

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

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

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

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

do-while

for

while

select

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

static

auto

private

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

scanf()

exit()

printf()

malloc()

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

const

#define

define

macro

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

scanf

printf

while

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

math.h

stdlib.h

string.h

stdio.h

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

static

#define

constant

const int

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

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

sizeof()

strlength()

strlen()

length()

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

volatile

loop

static

extern

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

Interface

Object

Class

Function

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

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

+, -, *, /

*, /, +, -

/, *, -, +

*, +, /, -

20. What does getch() function do?

Reads a single character without echoing

Prints a character

Compares characters

Terminates the program

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

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

char

int

float

short

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

if ? then : else

condition ? if : else

if (condition) then else

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

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

Array

Function

Variable

Constant

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

alias

typedef

struct

Page 2 of 2

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

"A"

'A'

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

Both A and B

int p = NULL;

int *p = NULL;

int *p = 0;

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

1 to 255

-128 to 127

0 to 127

0 to 255

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

object

define

struct

typedef

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

Depends on the compiler

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

true

false

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

declare fun()

int = fun()

void fun()

function fun()

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

Garbage value

NULL

34. What does the keyword static do?

Preserves the value of a variable between function calls

Allows modification

Makes a variable global

Frees memory

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

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

strcpy()

append()

stradd()

strcat()

37. Which of these is a bitwise operator?

38. What is a pointer?

A variable that stores an address

A compiler error

A keyword

A data type

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

strcpy()

assign()

strcopy()

copystr()

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

function myFunction()

def myFunction()

func myFunction()

void myFunction();

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

stop()

exit()

end()

terminate()

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

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

for

continue

break

switch

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

It sends 0 to the compiler

It returns success to the operating system

It stops the program

It initializes a variable

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

conio.h

string.h

stdio.h

stdlib.h

46. Which format specifier is used for double values?

%lf

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

/* */

48. Which operator has the highest precedence?

()

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

final

const

extern

static

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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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