Memory Allocation — Part 2 MCQs with Explanations

calloc() is the correct answer to “Which of the following functions allocates multiple blocks of memory, each block of the same size”. This question is standard in competitive examination syllabi for Memory Allocation.

Memory leak is the correct answer to “A condition where in memory is reserved dynamically but not accessible to any of the programs is called . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

stdlib.h is the correct answer to “Which of the following header files must necessarily be included to use dynamic memory allocation functions”. This question is standard in competitive examination syllabi for Memory Allocation.

Error in the statement: *p=(char)calloc(10) is the correct answer to “What will be the error (if any) in the following C code? #include<stdio.h> #include<stdlib.h> #include<string.h> int main() { char *p; *p = (char)calloc(10); strcpy(p, "HELLO"); printf("%s", p); free(p); return 0; }”. This question is standard in competitive examination syllabi for Memory Allocation.

Memory leak is the correct answer to “What will happens if the statement free(a) is removed in the following C code? #include<stdio.h> #include<stdlib.h> main() { int *a; a=(int*)malloc(sizeof(int)); *a=100; printf("*a%d",*a); free(a); a=(int*)malloc(sizeof(int)); *a=200; printf("a%p",a); *a=200; printf("a%d",*a); }”. This question is standard in competitive examination syllabi for Memory Allocation.

is not initialized is the correct answer to “In the function realloc(), if the new size of the memory block is larger than the old size, then the added memory . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

4 is the correct answer to “What will be the output of the following C code if it is executed on a 32 bit processor? #include<stdio.h> #include<stdlib.h> int main() { int *p; p = (int *)malloc(20); printf("%d\n", sizeof(p)); free(p); return 0; }”. This question is standard in competitive examination syllabi for Memory Allocation.

Memory leak is the correct answer to “Garbage collector frees the programmer from worrying about . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

x=(int*)malloc(10*sizeof(int)) is the correct answer to “Suppose we have a one dimensional array, named 'x', which contains 10 integers. Which of the following is the correct way to allocate memory dynamically to the array 'x' using malloc()”. This question is standard in competitive examination syllabi for Memory Allocation.

First In First Out (FIFO) is the correct answer to “Queue data structure works on the principle of . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

Array is the correct answer to “Which of the following is an example of static memory allocation”. This question is standard in competitive examination syllabi for Memory Allocation.

0123 01234 is the correct answer to “What will be the output of the following C code? (Given that the size of array is 4 and new size of array is 5) #include<stdio.h> #include<stdlib.h> main() { int *p,i,a,b; printf("Enter size of array"); scanf("%d",&a); p=(int*)malloc(a*sizeof(int)); for(i=0;i<a;i++) printf("%d\n",i); printf("Enter new size of array"); scanf("%d",&b); realloc(p,b); for(i=0;i<b;i++) printf("%d\n",i); free(p); }”. This question is standard in competitive examination syllabi for Memory Allocation.

Singly linked list is the correct answer to “The type of linked list in which the node does not contain any pointer or reference to the previous node is . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

False is the correct answer to “In the function malloc(), each byte of allocated space is initialized to zero.”. This question is standard in competitive examination syllabi for Memory Allocation.

1 is the correct answer to “The number of arguments taken as input which allocating memory dynamically using malloc() is . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

Execution of the program is faster than that of static memory allocation is the correct answer to “Choose the statement which is incorrect with respect to dynamic memory allocation.”. This question is standard in competitive examination syllabi for Memory Allocation.

Everything on the heap is anonymous is the correct answer to “Pick out the correct statement with respect to the heap.”. This question is standard in competitive examination syllabi for Memory Allocation.

False is the correct answer to “The size of both stack and heap remains the same during run time.”. This question is standard in competitive examination syllabi for Memory Allocation.

Insertion and deletion of an element can be done at any position in a linked list is the correct answer to “The advantage of using linked lists over arrays is that . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.

If memory leak occurs, it is mandatory that a dangling pointer arises is the correct answer to “The incorrect statement with respect to dangling pointers is . . . . . . . .”. This question is standard in competitive examination syllabi for Memory Allocation.