# Data Structures MCQ with Answer

1. Minimum number of fields in each node of a doubly linked list is____

(A) 2

(B) 3

(C) 4

(D) None of the above

Ans: B

3

2. A graph in which all vertices have equal degree is known as ____

(A) Complete graph

(B) Regular graph

(C) Multi graph

(D) Simple graph

Ans: A

Complete graph

3. A vertex of in-degree zero in a directed graph is called a/an

(A) Root vertex

(B) Isolated vertex

(C) Sink

(D) Articulation point

Ans: C

Sink

4. A graph is a tree if and only if graph is

(A) Directed graph

(B) Contains no cycles

(C) Planar

(D) Completely connected

Ans: B

Contains no cycles

5. The elements of a linked list are stored

(A) In a structure

(B) In an array

(C) Anywhere the computer has space for them

(D) In contiguous memory locations

Ans: C

Anywhere the computer has space for them

6. A parentheses checker program would be best implemented using

(A) List

(B) Queue

(C) Stack

(D) Any of the above

Ans: C

Stack

7. To perform level-order traversal on a binary tree, which of the

following data structure will be required?

(A) Hash table

(B) Queue

(C) Binary search tree

(D) Stack

Ans: B

Queue

8. Which of the following data structure is required to convert

arithmetic expression in infix to its equivalent postfix notation?

(A) Queue

(B) Linked list

(C) Binary search tree

(D) None of above

Ans: D

None of above

9. A binary tree in which all its levels except the last, have maximum numbers of nodes, and all the nodes in the last level have only one child it will be its left child. Name the tree.

(A) Threaded tree

(B) Complete binary tree

(C) M-way search tree

(D) Full binary tree

Ans: B

Complete binary tree

10. Which of following data structure is more appropriate for

implementing quick sort iteratively?

(A) Deque

(B) Queue

(C) Stack

(D) Priority queue

Ans: C

Stack

11. The number of edges in a complete graph of n vertices is

(A) n(n+1)/2

(B) n(n-1)/2

(C) n2

/2

(D) n

Ans: B

n(n-1)/2

12. If two trees have same structure and but different node content,

then they are called ___

(A) Synonyms trees

(B) Joint trees

(C) Equivalent trees

(D) Similar trees

Ans: D

Similar trees

13. If two trees have same structure and node content, then they are

called ____

(A) Synonyms trees

(B) Joint trees

(C) Equivalent trees

(D) Similar trees

Ans: C

Equivalent trees

14. Finding the location of a given item in a collection of items is called ……

A. Discovering

B. Finding

C. Searching

D. Mining

Ans. C

searching

15. The time complexity of quicksort is ……..

A. O(n)

B. O(logn)

C. O(n2)

D. O(n logn)

Ans. D

O(n logn)

16. Quick sort is also known as ……..

A. merge sort

B. tree sort

C. shell sort

D. partition and exchange sort

Ans. D

partition and exchange sort

17. ………. sorting is good to use when alphabetizing a large list of names.

A. Merge

B. Heap

C. Radix

D. Bubble

Ans. C

Radix

18. The total number of comparisons in a bubble sort is ….

A. O(n logn)

B. O(2n)

C. O(n2)

D. O(n)

Ans. A

O(n logn)

19. ……… form of access is used to add and remove nodes from a queue.

A. LIFO, Last In First Out

B. FIFO, First In First Out

C. Both a and b

D. None of these

Ans. B

FIFO, First In First Out

20. New nodes are added to the ……… of the queue.

A. Front

B. Back

C. Middle

D. Both A and B

Ans. B

Back

21. The term push and pop is related to

A. Array

B. Lists

C. Stacks

D. Trees

Ans. C

Stacks

22. Which of the following is an application of stack?

A. finding factorial

B. tower of Hanoi

C. infix to postfix

D. all of the above

Ans. D

all of the above

23. The operation of processing each element in the list is known as ……

A. sorting

B. merging

C. inserting

D. traversal

Ans. D

traversal

24. The situation when in a linked list START=NULL is ….

A. Underflow

B. Overflow

C. Houseful

D. Saturated

Ans. A

Underflow

25. Which of the following are two-way lists?

A. Grounded header list

B. Circular header list

C. Linked list with header and trailer nodes

D. List traversed in two directions

Ans. D

List traversed in two directions

26. Which is the pointer associated with the availability list?

A. FIRST

B. AVAIL

C. TOP

D. REAR

Ans. B

AVAIL

27. Which of the following data structure can’t store the non-homogeneous data

elements?

A) Arrays

B) Records

C) Pointers

D) Stacks

Ans. A

Arrays

28. Which of the following is non-liner data structure?

A) Stacks

B) List

C) Strings

D) Trees

Ans. D

Trees

29. To represent hierarchical relationship between elements, which data

structure is suitable?

A) Dequeue

B) Priority

C) Tree

D) Graph

Ans. C

Tree

30. Identify the data structure which allows deletions at both ends of the list but

insertion at only one end.

A) Input restricted dequeue

B) Output restricted qequeue

C) Priority queues

D) Stack

Ans. A

Input restricted dequeue

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