Data Structures Algorithms Online Quiz


Following quiz provides Multiple Choice Questions (MCQs) related to Data Structures Algorithms. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Answer : D

Explanation

Polish Notation

Q 2 - What data structure is used for depth first traversal of a graph?

A - queue

B - stack

C - list

D - none of the above

Answer : B

Explanation

Stack is used for depth first traversal whereas queue is used for breadth first traversal

Q 3 - Which of the following asymptotic notation is the worst among all?

A - Ο(n+9378)

B - Ο(n3)

C - nΟ(1)

D - 2Ο(n)

Answer : B

Explanation

Ο(n+9378) is n dependent

Ο(n3) is cubic

nΟ(1) is polynomial

2Ο(n) is exponential

Q 4 - Which of the following algorithm is not stable?

A - Bubble Sort

B - Quick Sort

C - Merge Sort

D - Insertion Sort

Answer : B

Explanation

Among the given, only quick sort is not stable that is it may re-arrange the already sorted items.

Q 5 - Which method can find if two vertices x & y have path between them?

A - Depth First Search

B - Breadth First Search

C - Both A & B

D - None A or B

Answer : C

Explanation

By using both BFS and DFS, a path between two vertices of a connected graph can be determined.

Q 6 - Which of the below given sorting techniques has highest best-case runtime complexity −

A - quick sort

B - selection sort

C - insertion sort

D - bubble sort

Answer : B

Explanation

Selection sort best case time complexity is Ο(n2)

Answer : C

Explanation

Remembering the results of previously calculated solutions is called memoization.

Answer : D

Explanation

Regardless of being min heap or max heap, root is always replaced by last element of the last level.

Q 9 - Access time of a binary search tree may go worse in terms of time complexity upto

A - Ο(n2)

B - Ο(n log n)

C - Ο(n)

D - Ο(1)

Answer : C

Explanation

At maximum, BST may need to search all n values in the tree in order to access an element, hence, Ο(n).

Q 10 - The worst case complexity of binary search matches with −

A - interpolation search

B - linear search

C - merge sort

D - none of the above

Answer : B

Explanation

In the worst case a binary search needs to access all elements of the target list, same as linear search.

data_structures_algorithms_questions_answers.htm
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