Memory Allocation MCQs

Question 1

What is a memory leak in C?

Accepted Answer

Failure to deallocate dynamically allocated memory

Answer

Memory allocation error

Answer

Excessive memory deallocation

Answer

Memory corruption

Question 2

What is the purpose of the 'free' function in C?

Accepted Answer

To deallocate dynamically allocated memory

Answer

To allocate memory

Answer

To copy memory

Answer

To check for memory leaks

Question 3

How do you check if the 'malloc' function has successfully allocated memory in C?

Accepted Answer

Check if the return value is not NULL

Answer

Check if the return value is 1

Answer

Check if the return value is -1

Answer

Check if the return value is 0

Question 4

Which function is used to return the number of bytes allocated by 'malloc'?

Accepted Answer

sizeofmalloc()

Answer

malloc_size()

Answer

size()

Answer

malloc_bytes()

Question 5

What is the return value of the 'realloc' function if it fails to reallocate memory?

Accepted Answer

Answer

-1

Answer

0

Answer

1

Question 6

In C, what is the purpose of the 'calloc' function?

Accepted Answer

To allocate and initialize a block of memory

Answer

To deallocate memory

Answer

To copy memory

Answer

To check for memory leaks

Question 7

What does the 'sizeof' operator in C return for a dynamically allocated array?

Accepted Answer

Size of a single element

Answer

Size of the entire array

Answer

Size of the pointer

Answer

Size of the first element

Question 8

Which function is used to allocate memory for an array of character strings in C?

Accepted Answer

calloc()

Answer

malloc()

Answer

alloc()

Answer

stralloc()

Question 9

What is a segmentation fault in C?

Accepted Answer

An error that occurs when accessing an invalid memory location

Answer

An error in memory allocation

Answer

An error when allocating a string

Answer

An error in file I/O