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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