DMA Functions, Memory Leak, Dangling Pointers MCQ

Test your knowledge with important DMA Functions, Memory Leak, Dangling Pointers MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more DMA Functions, Memory Leak, Dangling Pointers MCQs on Bissoy. Bissoy App

• If the space in memory allocated by malloc is not sufficient, then an allocation fails and returns ___________
  ক

  NULL pointer

  খ

  Zero

  গ

  Garbage value

  ঘ

  The number of bytes available
• Garbage collector frees the programmer from worrying about ___________
  ক

  Dangling pointers

  খ

  Creating new objects

  গ

  Memory leak

  ঘ

  Segmentation errors
• When the pointer is NULL, then the function realloc is equivalent to the function ___________
  ক

  malloc

  খ

  calloc

  গ

  free

  ঘ

  alloc
• Pick out the correct statement with respect to the heap.
  ক

  Local variables are stored on the heap

  খ

  Static variables are stored on the heap

  গ

  Heap is the data structure that is used to implement recursive function calls

  ঘ

  Everything on the heap is anonymous
• If malloc() and calloc() are not type casted, the default return type is ___________
  ক

  void*

  খ

  void**

  গ

  int*

  ঘ

  char*
• 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()?
  ক

  x=(int*)malloc(10);

  খ

  x=(int*)malloc(10,sizeof(int));

  গ

  x=malloc(int 10,sizeof(int));

  ঘ

  x=(int*)malloc(10*sizeof(int));
• The number of arguments taken as input which allocating memory dynamically using malloc() is ___________
  ক

  0

  খ

  1

  গ

  2

  ঘ

  3
• The free() function frees the memory state pointed to by a pointer and returns ___________
  ক

  the same pointer

  খ

  the memory address

  গ

  no value

  ঘ

  an integer value
• In the function realloc(), if the new size of the memory block is larger than the old size, then the added memory ___________
  ক

  is initialized to junk values

  খ

  is initialized to zero

  গ

  results in an error

  ঘ

  is not initialized
• The incorrect statement with respect to dangling pointers is ___________
  ক

  Pointer pointing to non-existent memory location is called dangling pointer

  খ

  When a dynamically allocated pointer references the original memory after it has been freed, a dangling pointer arises

  গ

  If memory leak occurs, it is mandatory that a dangling pointer arises

  ঘ

  Dangling pointer may result in segmentation faults and potential security risks
• A condition where in memory is reserved dynamically but not accessible to any of the programs is called _____________
  ক

  Memory leak

  খ

  Dangling pointer

  গ

  Frozen memory

  ঘ

  Pointer leak
• Which of the following functions allocates multiple blocks of memory, each block of the same size?
  ক

  malloc()

  খ

  realloc()

  গ

  calloc()

  ঘ

  free()
• In the function malloc(), each byte of allocated space is initialized to zero.
  ক

  True

  খ

  False