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Memory Allocation - Objective type Interview question with answers on C Programming

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C programming language memory allocation quiz & multiple choice questions(mcqs) and answers are available to download in PDF for free. These objective type questions with Answers are useful for preparations of competitive exams like CBSE NET, GATE, NIELIT, BCA, B.Sc. MCA, M.Sc. B.Tech, M.Tech, BE, ME etc.
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(1) With every use of memory allocation function, what function should be used to release allocated memory which is no longer needed?
[A] dropmem()
[B] dealloc()
[C] release()
[D] free()

Comment

Answer: Option [D]

The library function free() is used to deallocate the memory that is no longer be used. This deallocated memory is dynamically allocated by malloc, calloc and realloc previously.

(2) Physically placing the machine instructions and data into main memory is done by
[A] Linker
[B] Loader
[C] Code Generator
[D] Interpreter

Comment

Answer: Option [B]

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(3) Which header file should be included to use function like malloc() and calloc()?
[A] memory.h
[B] stdlib.h
[C] string.h
[D] dos.h

Comment

Answer: Option [B]

The stdlib.h header file contains malloc(), calloc() and realloc() dynamically allocated array functions.

(4) How will you free the allocated memory?
[A] remove(variable-name);
[B] free(variable-name);
[C] delete(variable-name);
[D] dealloc(variable-name);

Comment

Answer: Option [B]
(5) Which data structure is used by malloc() for object creation?
[A] Heap
[B] Tree
[C] Stack
[D] Queue

Comment

Answer: Option [A]

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