Computer Functions in “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

Important Computer Functions in “C” Question and Answer

Total Questions:	20
Time Allowed:	20 Minutes
Total Marks:	20
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Functions in “C” Practice Test Online With Explanation

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1. Which keyword is used to define a function in C?

func

define

No keyword is required

void

2. Which header file is needed for exit()?

math.h

stdio.h

conio.h

stdlib.h

3. How many values can a function return in C?

Only one

Two

Unlimited

Zero

4. What is the scope of a function declared as static?

Global

Function-level

External

File-level

5. What is the correct syntax to call a function named display?

call display();

display;

call display;

display();

6. What is function overloading?

Not supported in C

Functions with same name and parameters

Function with multiple return types

Multiple functions with same name but different parameters

7. What is the return type of main() usually?

float

int

char

void

8. Which of the following passes arguments by value in C?

Default parameter passing

Pointer passing

Pass by address

Reference passing

9. Can we use the same function name for different return types?

Only in C++

Yes

Only in main()

10. What is the default return type of a function in C if not specified?

void

int

char

float

11. Which of the following is a valid function declaration in C?

function sum(int, int);

def sum(int, int);

int sum(int, int);

sum(int, int);

12. Which of the following is not a valid return type of a function?

float

array

int

void

13. Which of the following functions is used to terminate a program?

exit()

return

continue

break

14. Which function is always present in every C program?

init()

entry()

start()

main()

15. Which keyword is used to declare a function that can call itself?

recur

No special keyword needed

self

recursive

16. Which of the following is correct about recursion?

Every recursive function must have a condition to stop

Recursion is only allowed once

Recursion needs goto

Recursion cannot be used in C

17. What is a function prototype?

A declaration of a function before its use

A function call

A function definition

None of these

18. Which of the following is used to return a value from a function?

break

end

return

exit

19. What does the void return type signify?

Returns zero

Returns nothing

Returns a pointer

Returns a number

20. Which of the following is not true about functions?

They can return more than one value directly

They improve code readability

They reduce code duplication

They help in modular programming

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Mustansar KhanLast Updated: October 15, 2025

Important Computer Functions in “C” Question and Answer

Functions in “C” Practice Test Online With Explanation

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