# Kruskal’s Algorithm Multiple choice Questions and Answers (MCQs)

## Click on any option to know the CORRECT ANSWERS

 Question 1
Kruskal's algorithm is used to .....
 A find minimum spanning tree B find single source shortest path C find all pair shortest path algorithm D traverse the graph

Question 1 Explanation:
The Kruskal's algorithm is used to find the minimum spanning tree of the connected graph. It construct the MST by finding the edge having the least possible weight that connects two trees in the forest.

 Question 2
Kruskal's algorithm is a .....
 A divide and conquer algorithm B dynamic programming algorithm C greedy algorithm D approximation algorithm

Question 2 Explanation:
Kruskal's algorithm uses a greedy algorithm approach to find the MST of the connected weighted graph. In the greedy method, we attempt to find an optimal solution in stages.

 Question 3
Consider the given graph.

What is the weight of the minimum spanning tree using the Kruskal's algorithm?

 A 24 B 23 C 15 D 19

Question 3 Explanation:
Kruskal's algorithm constructs the minimum spanning tree by constructing by adding the edges to spanning tree one-one by one. The MST for the given graph is,

So, the weight of the MST is 19.

 Question 4
What is the time complexity of Kruskal's algorithm?
 A O(log V) B O(E log V) C O(E2) D O(V log E)

Question 4 Explanation:
Kruskal's algorithm involves sorting of the edges, which takes O(E logE) time, where E is a number of edges in graph and V is the number of vertices. After sorting, all edges are iterated and union-find algorithm is applied. union-find algorithm requires O(logV) time. So, overall Kruskal's algorithm requires O(E log V) time.

 Question 5
Consider the following graph. Using Kruskal's algorithm, which edge will be selected first?
 A GF B DE C BE D BG