Algorithms MCQ
Our website offers a collection of Algorithms MCQs to help learners practice and understand important computer science concepts. The questions cover topics like sorting, searching, recursion, dynamic programming, graph theory, and complexity analysis. Each MCQ is made to test knowledge and improve problem-solving skills. Clear explanations are provided with answers so learners can easily understand their mistakes. This platform is helpful for students, professionals, and interview candidates, making algorithm preparation easier and more effective.
Q1. Which of the following is the time complexity of binary search algorithm?
A. O(n)
B. O(log n)
C. O(n log n)
D. O(1)
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Q2. Which sorting algorithm has the best average case time complexity?
A. Bubble Sort
B. Insertion Sort
C. Merge Sort
D. Selection Sort
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Q3. In a graph, which traversal technique uses a queue?
A. Depth First Search (DFS)
B. Breadth First Search (BFS)
C. Dijkstra’s Algorithm
D. Prim’s Algorithm
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Q4. Which data structure is used in a recursive function call?
A. Queue
B. Stack
C. Linked List
D. Heap
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Q5. Which sorting algorithm has the best average-case performance?
A. Bubble Sort
B. Quick Sort
C. Selection Sort
D. Insertion Sort
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Q6. What is the time complexity of binary search algorithm?
A. O(n)
B. O(log n)
C. O(n log n)
D. O(1)
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Q7. Dijkstra’s algorithm is used to solve:
A. Minimum spanning tree
B. All-pairs shortest path
C. Single-source shortest path
D. Maximum flow
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Q8. Which data structure is used in Depth First Search (DFS)?
A. Queue
B. Stack
C. Heap
D. Priority Queue
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Q9. Which of the following has the worst-case time complexity O(n^2)?
A. Merge Sort
B. Heap Sort
C. Bubble Sort
D. Quick Sort
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Q10. What is the space complexity of Merge Sort?
A. O(1)
B. O(log n)
C. O(n)
D. O(n log n)
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Q11. Which algorithm is commonly used for finding Minimum Spanning Tree?
A. Dijkstra’s algorithm
B. Prim’s algorithm
C. Floyd-Warshall algorithm
D. Bellman-Ford algorithm
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Q12. Which searching algorithm is best for unsorted data?
A. Binary Search
B. Jump Search
C. Linear Search
D. Exponential Search
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Q13. What is the time complexity of Heap Sort?
A. O(n)
B. O(n log n)
C. O(log n)
D. O(n^2)
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Q14. The Knuth-Morris-Pratt (KMP) algorithm is used for:
A. Sorting numbers
B. Finding shortest path
C. String pattern matching
D. Matrix multiplication
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Q15. Which traversal is used in Breadth First Search (BFS)?
A. Inorder
B. Level order
C. Postorder
D. Preorder
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Q16. Which algorithm is used for solving the all-pairs shortest path problem?
A. Dijkstra’s algorithm
B. Floyd-Warshall algorithm
C. Kruskal’s algorithm
D. Prim’s algorithm
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Q17. Which of the following problems is NP-complete?
A. Binary Search
B. Traveling Salesman Problem
C. Merge Sort
D. Prim’s Algorithm
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Q18. Which sorting algorithm is stable?
A. Quick Sort
B. Merge Sort
C. Heap Sort
D. Selection Sort
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Q19. Which algorithm is used in operating systems for deadlock detection?
A. Dijkstra’s algorithm
B. Banker’s algorithm
C. Bellman-Ford algorithm
D. Kruskal’s algorithm
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Q20. What is the best-case time complexity of Quick Sort?
A. O(n)
B. O(n log n)
C. O(n^2)
D. O(log n)
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Q21. Which graph traversal guarantees finding the shortest path in an unweighted graph?
A. DFS
B. BFS
C. Dijkstra’s algorithm
D. Prim’s algorithm
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Q22. What is the recurrence relation for Merge Sort?
A. T(n) = T(n-1) + O(1)
B. T(n) = 2T(n/2) + O(n)
C. T(n) = T(n/2) + O(1)
D. T(n) = T(n/2) + O(n)
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Q23. Which algorithm uses dynamic programming to solve shortest path problems?
A. Bellman-Ford algorithm
B. Dijkstra’s algorithm
C. Kruskal’s algorithm
D. Prim’s algorithm
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Q24. Which of the following is a divide and conquer algorithm?
A. Quick Sort
B. Bubble Sort
C. Selection Sort
D. Linear Search
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Q25. Are algorithms Artificial Intelligence?
A. Yes, algorithms and AI are the same
B. No, algorithms and AI are completely unrelated
C. Algorithms are a part of AI, but not the same
D. AI does not use algorithms
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Q26. Can algorithms perform logical operations?
A. Yes, algorithms can perform logical operations
B. No, algorithms cannot perform any logical task
C. Algorithms only store data
D. Algorithms work only with numbers
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Q27. How do algorithms work?
A. By randomly guessing solutions
B. By following a set of step-by-step instructions
C. By working without any input
D. By only storing information
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Q28. Are algorithms and data structures hard to learn?
A. Yes, they are impossible to learn
B. No, they are always easy for everyone
C. They can feel challenging at first, but become easier with practice
D. They are only useful for expert programmers
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Q29. What does the term “algorithm” mean?
A. A computer device used for coding
B. A step-by-step process used to solve a problem
C. A type of programming language
D. A software error in a program
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Q30. Which of the following algorithms will run in constant time?
A. Finding the largest number in an unsorted array
B. Accessing an element in an array using its index
C. Sorting an array using bubble sort
D. Searching for an element using linear search
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Q31. Where are algorithms found?
A. Only in computer science books
B. Only in mobile applications
C. In computers, apps, websites, machines, and everyday problem-solving processes
D. Only in calculators
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Q32. Which sorting algorithm is most commonly used?
A. Bubble Sort
B. Quick Sort
C. Selection Sort
D. Insertion Sort
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Q33. Which algorithm can help ensure data integrity?
A. Bubble Sort
B. SHA-256 hashing algorithm
C. Linear Search
D. Binary Tree Traversal
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Q34. Who are algorithms primarily created for?
A. Only for expert programmers
B. Only for robots and machines
C. For solving problems for computers, systems, and users
D. Only for students learning coding
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Q35. Why are algorithms called algorithms?
A. Because the word comes from a type of computer machine
B. Because it was the original name of a programming language
C. Because the term comes from the name of the mathematician Al-Khwarizmi
D. Because it means artificial logic in English
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