Quiz for Memory management techniques

Q1: Which function is used to allocate dynamic memory in C?

A. malloc B. free C. realloc D. calloc

Q2: Which function is used to deallocate previously allocated memory?

A. free B. malloc C. realloc D. calloc

Q3: What is the difference between malloc and calloc?

A. calloc initializes memory to zero, malloc does not B. malloc initializes memory to zero, calloc does not C. calloc allocates memory, malloc frees memory D. No difference

Q4: Which function changes the size of previously allocated memory?

A. realloc B. malloc C. free D. calloc

Q5: What happens if malloc fails to allocate memory?

A. Returns NULL pointer B. Takes more memory C. Throws exception D. Returns zero

Q6: What is a memory leak?

A. Allocated memory not freed B. Freeing unallocated memory C. Overwriting memory D. Allocating memory multiple times

Q7: Which function allocates memory and initializes it to zero?

A. calloc B. malloc C. realloc D. free

Q8: Can you use realloc with a NULL pointer?

A. Yes, acts like malloc B. No C. Only with free D. Only if memory is zero

Q9: Is it safe to free a NULL pointer?

A. Yes, does nothing B. No, causes crash C. Depends on compiler D. Only in debug mode

Q10: Which header file defines malloc, free, calloc, realloc?

A. stdlib.h B. stdio.h C. memory.h D. string.h

Q11: What is dangling pointer?

A. Pointer to freed memory B. Pointer not initialized C. Pointer to NULL D. Pointer to int

Q12: How to avoid memory leaks?

A. Free allocated memory B. Reallocate memory C. Avoid pointers D. Use arrays only

Q13: What does realloc(NULL, size) do?

A. Allocates new memory B. Frees memory C. Throws error D. Returns NULL

Q14: What is fragmentation in memory management?

A. Memory divided into small unusable blocks B. Memory leaks C. Memory overflow D. Pointer errors

Q15: Which memory management issue causes program crash?

A. Use after free B. Memory leak C. Fragmentation D. Allocation

Q16: Which function returns pointer to allocated memory initialized to zero?

A. calloc B. malloc C. realloc D. free

Q17: Does malloc initialize the allocated memory?

A. No B. Yes C. Only for zero size D. Only in debug mode

Q18: What is the use of free function?

A. Deallocate dynamic memory B. Allocate memory C. Reallocate memory D. Copy memory

Q19: What happens if you free the same pointer twice?

A. Undefined behavior B. Safe operation C. Compiler error D. Returns NULL

Q20: Which is safest way to allocate zero-initialized array?

A. calloc B. malloc C. realloc D. free