Top 100 Algorithms MCQs with Answers 2026
Prepare effectively for exams with Top 100 Algorithms MCQs with Answers 2026 on MCQ Journey. This comprehensive collection of multiple‑choice questions is designed for Computer Science students, engineering aspirants, and competitive exam candidates preparing for GATE, UGC NET, SSC, UPSC, campus placements, and university tests. Each question is carefully curated to cover key topics in algorithms, including sorting, searching, graph theory, dynamic programming, and complexity analysis. With detailed answers and explanations, learners can strengthen their conceptual understanding, practice problem‑solving, and improve exam readiness. These MCQs with answers serve as an excellent resource for exam preparation, interview practice, and self‑study, helping students build confidence and accuracy. Whether you are revising fundamentals or tackling advanced algorithm concepts, this set of practice questions provides a reliable, student‑friendly guide to mastering algorithms. Stay ahead in 2026 with updated, exam‑relevant content tailored to boost your performance in competitive exams and academic assessments.
Q1. Which of the following sorting algorithms is stable?
A. Quick Sort B. Merge Sort C. Heap Sort D. Selection Sort Answer: B Explanation: Merge Sort maintains the relative order of equal elements.
Q2. What is the worst-case time complexity of quicksort?
A. O(n log n) B. O(n²) C. O(log n) D. O(n) Answer: B
Q3. Which algorithm is used to find the shortest path in a weighted graph with non-negative edges?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Kruskal’s Algorithm Answer: C
Q4. Which of the following is a divide-and-conquer algorithm?
A. Merge Sort B. Bubble Sort C. Insertion Sort D. Selection Sort Answer: A
Q5. Which algorithm is used to detect cycles in a graph?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Prim’s Algorithm Answer: B
Q6. Which of the following is used in Huffman coding?
A. Stack B. Heap C. Queue D. Array Answer: B
Q7. Which algorithm is used to find minimum spanning tree?
A. Dijkstra’s Algorithm B. Kruskal’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: B
Q8. Which of the following is true about dynamic programming?
A. It solves problems by recursion only. B. It stores solutions to subproblems. C. It is slower than brute force. D. It cannot be used for optimization. Answer: B
Q9. Which algorithm is efficient for finding strongly connected components in a graph?
A. Tarjan’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q10. Which of the following is true about greedy algorithms?
A. They always give optimal solutions. B. They make locally optimal choices. C. They are slower than dynamic programming. D. They cannot be used in graph problems. Answer: B
Q11. Which algorithm is used for finding all pairs shortest paths?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Floyd-Warshall Algorithm D. Kruskal’s Algorithm Answer: C Explanation: Floyd-Warshall computes shortest paths between all pairs of vertices using dynamic programming.
Q12. Which of the following is true about bubble sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It is faster than merge sort. Answer: A
Q13. Which algorithm is used in topological sorting of a directed acyclic graph (DAG)?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Kruskal’s Algorithm Answer: B
Q14. Which of the following is true about Bellman-Ford algorithm?
A. Works only with positive weights. B. Detects negative weight cycles. C. Faster than Dijkstra’s algorithm. D. Cannot be used in graphs. Answer: B
Q15. Which algorithm is used in finding maximum flow in a network?
A. Kruskal’s Algorithm B. Ford-Fulkerson Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: B
Q16. Which of the following is true about insertion sort?
A. It is stable. B. It is unstable. C. It has O(n²) complexity in all cases. D. It is faster than merge sort. Answer: A
Q17. Which algorithm is used in finding minimum spanning tree using greedy approach?
A. Prim’s Algorithm B. Bellman-Ford Algorithm C. Floyd-Warshall Algorithm D. DFS Answer: A
Q18. Which of the following is true about dynamic programming?
A. It avoids recomputation by storing results. B. It always uses recursion. C. It is slower than brute force. D. It cannot solve optimization problems. Answer: A
Q19. Which algorithm is used in finding articulation points in a graph?
A. Tarjan’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q20. Which of the following is true about greedy algorithms?
A. They make locally optimal choices. B. They always guarantee global optimum. C. They cannot be used in graph problems. D. They are slower than dynamic programming. Answer: A
Q21. Which algorithm is used for finding shortest paths in graphs with negative weights?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Prim’s Algorithm D. Kruskal’s Algorithm Answer: B Explanation: Bellman-Ford can handle negative weights and detect negative cycles.
Q22. Which of the following is true about selection sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It is faster than merge sort. Answer: B
Q23. Which algorithm is used in finding maximum bipartite matching?
A. Ford-Fulkerson Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q24. Which of the following is true about quicksort?
A. It is stable. B. It is unstable. C. It has O(n²) worst-case complexity. D. Both B and C Answer: D
Q25. Which algorithm is used in finding shortest path using dynamic programming?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q26. Which of the following is true about merge sort?
A. It is stable. B. It is unstable. C. It has O(n²) complexity. D. It cannot be implemented recursively. Answer: A
Q27. Which algorithm is used in finding strongly connected components?
A. Tarjan’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q28. Which of the following is true about greedy algorithms?
A. They make locally optimal choices. B. They always guarantee global optimum. C. They cannot be used in graph problems. D. They are slower than dynamic programming. Answer: A
Q29. Which algorithm is used in finding minimum spanning tree using adjacency matrix?
A. Prim’s Algorithm B. Kruskal’s Algorithm C. Bellman-Ford Algorithm D. DFS Answer: A
Q30. Which of the following is true about dynamic programming?
A. It stores solutions to subproblems. B. It always uses recursion. C. It is slower than brute force. D. It cannot solve optimization problems. Answer: A
Q31. Which algorithm is used in finding shortest paths in DAGs?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Topological Sort + Relaxation D. Kruskal’s Algorithm Answer: C Explanation: DAG shortest paths are efficiently solved using topological ordering followed by edge relaxation.
Q32. Which of the following is true about heap sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. Both B and C Answer: D
Q33. Which algorithm is used in finding maximum subarray sum?
A. Kadane’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q34. Which of the following is true about binary search?
A. Works only on sorted arrays. B. Works on unsorted arrays. C. Always O(n) complexity. D. Cannot be implemented recursively. Answer: A
Q35. Which algorithm is used in finding minimum spanning tree using union-find?
A. Kruskal’s Algorithm B. Prim’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: A
Q36. Which of the following is true about radix sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It cannot sort integers. Answer: A
Q37. Which algorithm is used in finding shortest path in unweighted graphs?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Kruskal’s Algorithm Answer: A
Q38. Which of the following is true about divide-and-conquer algorithms?
A. They split problems into subproblems. B. They cannot be recursive. C. They are slower than brute force. D. They cannot solve sorting problems. Answer: A
Q39. Which algorithm is used in finding transitive closure of a graph?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q40. Which of the following is true about dynamic programming?
A. It avoids recomputation by storing results. B. It always uses recursion. C. It is slower than brute force. D. It cannot solve optimization problems. Answer: A
Q41. Which algorithm is used to find shortest paths in graphs with negative cycles detection?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Prim’s Algorithm D. Kruskal’s Algorithm Answer: B Explanation: Bellman-Ford can detect negative weight cycles, unlike Dijkstra’s.
Q42. Which of the following is true about counting sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It cannot sort integers. Answer: A
Q43. Which algorithm is used in finding strongly connected components using DFS?
A. Kosaraju’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q44. Which of the following is true about quicksort’s average case complexity?
A. O(n²) B. O(n log n) C. O(log n) D. O(n) Answer: B
Q45. Which algorithm is used in finding shortest path in weighted DAGs?
A. Topological Sort + Relaxation B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q46. Which of the following is true about selection sort?
A. It is stable. B. It is unstable. C. It has O(n²) complexity. D. Both B and C Answer: D
Q47. Which algorithm is used in finding maximum flow using augmenting paths?
A. Ford-Fulkerson Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q48. Which of the following is true about merge sort’s complexity?
A. O(n log n) in all cases B. O(n²) in worst case C. O(log n) in best case D. O(n) in average case Answer: A
Q49. Which algorithm is used in finding minimum spanning tree using greedy approach?
A. Prim’s Algorithm B. Kruskal’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: B
Q50. Which of the following is true about dynamic programming problems?
A. They involve overlapping subproblems. B. They cannot be solved recursively. C. They are slower than brute force. D. They cannot solve optimization problems. Answer: A
Q51. Which algorithm is used in finding shortest path in weighted graphs with negative weights but no cycles?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Prim’s Algorithm D. Kruskal’s Algorithm Answer: B
Q52. Which of the following is true about shell sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity in all cases. D. It cannot sort integers. Answer: B
Q53. Which algorithm is used in finding maximum matching in bipartite graphs?
A. Hopcroft-Karp Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q54. Which of the following is true about quicksort’s best case complexity?
A. O(n²) B. O(n log n) C. O(log n) D. O(n) Answer: B
Q55. Which algorithm is used in finding shortest path using matrix multiplication?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q56. Which of the following is true about bucket sort?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It cannot sort integers. Answer: A
Q57. Which algorithm is used in finding minimum spanning tree using adjacency list?
A. Prim’s Algorithm B. Kruskal’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: A
Q58. Which of the following is true about dynamic programming?
A. It solves problems with overlapping subproblems. B. It cannot be recursive. C. It is slower than brute force. D. It cannot solve optimization problems. Answer: A
Q59. Which algorithm is used in finding strongly connected components using DFS stack?
A. Kosaraju’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q60. Which of the following is true about greedy algorithms?
A. They make locally optimal choices. B. They always guarantee global optimum. C. They cannot be used in graph problems. D. They are slower than dynamic programming. Answer: A
Q61. Which algorithm is used in finding shortest path in graphs with all positive weights?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Prim’s Algorithm D. Kruskal’s Algorithm Answer: A
Q62. Which of the following is true about radix sort’s complexity?
A. O(nk) where k is digit length B. O(n log n) C. O(n²) D. O(log n) Answer: A
Q63. Which algorithm is used in finding maximum flow using level graph?
A. Dinic’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q64. Which of the following is true about binary search’s complexity?
A. O(log n) B. O(n) C. O(n²) D. O(1) Answer: A
Q65. Which algorithm is used in finding minimum spanning tree using adjacency matrix and greedy approach?
A. Prim’s Algorithm B. Kruskal’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: A
Q66. Which of the following is true about counting sort’s stability?
A. It is stable. B. It is unstable. C. It has O(n log n) complexity. D. It cannot sort integers. Answer: A
Q67. Which algorithm is used in finding shortest path using repeated relaxation?
A. Bellman-Ford Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q68. Which of the following is true about greedy algorithms in graph problems?
A. They can be used in MST. B. They cannot be used in MST. C. They are slower than brute force. D. They cannot solve optimization problems. Answer: A
Q69. Which algorithm is used in finding transitive closure using matrix multiplication?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q70. Which of the following is true about dynamic programming’s principle?
A. Optimal substructure and overlapping subproblems. B. Only recursion. C. Slower than brute force. D. Cannot solve optimization problems. Answer: A
Q71. Which algorithm is used in finding shortest path in unweighted graphs?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Kruskal’s Algorithm Answer: A
Q72. Which of the following is true about heap sort’s stability?
A. It is stable. B. It is unstable. C. It has O(n²) complexity. D. It cannot sort integers. Answer: B
Q73. Which algorithm is used in finding maximum subarray sum efficiently?
A. Kadane’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q74. Which of the following is true about quicksort’s partitioning?
A. Divides array around pivot. B. Divides array into equal halves always. C. Cannot be recursive. D. Slower than bubble sort. Answer: A
Q75. Which algorithm is used in finding shortest path in DAG using topological order?
A. Topological Sort + Relaxation B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q76. Which algorithm is used in finding shortest path using greedy approach?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Floyd-Warshall Algorithm D. Kruskal’s Algorithm Answer: A
Q77. Which of the following is true about bubble sort’s complexity?
A. O(n²) in worst case B. O(n log n) in best case C. O(log n) in average case D. O(1) in all cases Answer: A
Q78. Which algorithm is used in finding maximum flow using blocking flows?
A. Dinic’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q79. Which of the following is true about insertion sort’s complexity?
A. O(n²) in worst case B. O(n log n) in best case C. O(log n) in average case D. O(1) in all cases Answer: A
Q80. Which algorithm is used in finding shortest path using repeated squaring?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q81. Which of the following is true about merge sort’s stability?
A. It is stable. B. It is unstable. C. It has O(n²) complexity. D. It cannot sort integers. Answer: A
Q82. Which algorithm is used in finding maximum bipartite matching efficiently?
A. Hopcroft-Karp Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q83. Which of the following is true about quicksort’s recursion?
A. It is recursive. B. It cannot be recursive. C. It is slower than bubble sort. D. It always divides into equal halves. Answer: A
Q84. Which algorithm is used in finding shortest path using adjacency matrix?
A. Floyd-Warshall Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q85. Which of the following is true about greedy algorithms in MST?
A. They can be used in Kruskal’s and Prim’s. B. They cannot be used in MST. C. They are slower than brute force. D. They cannot solve optimization problems. Answer: A
Q86. Which algorithm is used in finding maximum subarray sum using divide-and-conquer?
A. Divide-and-Conquer Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q87. Which of the following is true about counting sort’s complexity?
A. O(n + k) B. O(n log n) C. O(n²) D. O(log n) Answer: A
Q88. Which algorithm is used in finding shortest path using BFS in unweighted graphs?
A. BFS B. DFS C. Dijkstra’s Algorithm D. Kruskal’s Algorithm Answer: A
Q89. Which of the following is true about radix sort’s stability?
A. It is stable. B. It is unstable. C. It has O(n²) complexity. D. It cannot sort integers. Answer: A
Q90. Which algorithm is used in finding strongly connected components using DFS finishing times?
A. Kosaraju’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q91. Which algorithm is used in finding shortest path using adjacency list and greedy approach?
A. Dijkstra’s Algorithm B. Bellman-Ford Algorithm C. Prim’s Algorithm D. Kruskal’s Algorithm Answer: A
Q92. Which of the following is true about Floyd-Warshall algorithm?
A. Computes all pairs shortest paths. B. Works only with positive weights. C. Cannot detect negative cycles. D. Slower than Bellman-Ford for single source. Answer: A
Q93. Which algorithm is used in finding maximum flow using augmenting paths repeatedly?
A. Ford-Fulkerson Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q94. Which of the following is true about quicksort’s worst case?
A. O(n²) complexity B. O(n log n) complexity C. O(log n) complexity D. O(n) complexity Answer: A
Q95. Which algorithm is used in finding strongly connected components using DFS finishing times?
A. Kosaraju’s Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. Bellman-Ford Algorithm Answer: A
Q96. Which of the following is true about radix sort’s complexity?
A. O(nk) where k is digit length B. O(n log n) C. O(n²) D. O(log n) Answer: A
Q97. Which algorithm is used in finding shortest path using repeated relaxation for all edges?
A. Bellman-Ford Algorithm B. Kruskal’s Algorithm C. Prim’s Algorithm D. DFS Answer: A
Q98. Which of the following is true about greedy algorithms in optimization problems?
A. They may not always give global optimum. B. They always guarantee global optimum. C. They cannot be used in graph problems. D. They are slower than brute force. Answer: A
Q99. Which algorithm is used in finding minimum spanning tree using greedy approach and union-find?
A. Kruskal’s Algorithm B. Prim’s Algorithm C. Bellman-Ford Algorithm D. Floyd-Warshall Algorithm Answer: A
Q100. Which of the following is true about practicing algorithms MCQs?
A. Improves speed and accuracy in exams. B. Irrelevant for competitive exams. C. Cannot help in interviews. D. Not part of computer science. Answer: A
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