Sorting Algorithms MCQs – T4Tutorials.com

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1. : What is the primary goal of sorting algorithms?
(A) To compress data
(B) To organize data in a specific order
(C) To search for elements
(D) To encrypt data

2. : Which sorting algorithm has the best average-case time complexity?
(A) Bubble Sort
(B) Quick Sort
(C) Insertion Sort
(D) Selection Sort

3. : What is the worst-case time complexity of Bubble Sort?
(A) O(n log n)
(B) O(n²)
(C) O(n)
(D) O(log n)

4. : Which sorting algorithm is based on the divide-and-conquer strategy?
(A) Selection Sort
(B) Merge Sort
(C) Insertion Sort
(D) Heap Sort

5. : In which sorting algorithm is the largest element repeatedly swapped to the end of the list?
(A) Selection Sort
(B) Insertion Sort
(C) Quick Sort
(D) Bubble Sort

6. : What is the time complexity of Merge Sort in the worst case?
(A) O(n)
(B) O(n log n)
(C) O(n²)
(D) O(log n)

7. : Which sorting algorithm is generally the fastest for large datasets?
(A) Insertion Sort
(B) Merge Sort
(C) Quick Sort
(D) Bubble Sort

8. : What is the primary disadvantage of using Selection Sort?
(A) High memory usage
(B) Poor performance on large lists
(C) Complexity of implementation
(D) It is unstable

9. : Which sorting algorithm maintains the relative order of equal elements?
(A) Quick Sort
(B) Selection Sort
(C) Merge Sort
(D) Heap Sort

10. : What is the space complexity of Merge Sort?
(A) O(1)
(B) O(n)
(C) O(n log n)
(D) O(log n)

11. : In which algorithm does the pivot element play a critical role?
(A) Bubble Sort
(B) Quick Sort
(C) Selection Sort
(D) Merge Sort

12. : Which sorting algorithm is the most efficient for nearly sorted data?
(A) Quick Sort
(B) Bubble Sort
(C) Insertion Sort
(D) Heap Sort

13. : What is the average-case time complexity of Insertion Sort?
(A) O(n log n)
(B) O(n²)
(C) O(n)
(D) O(log n)

14. : Which of the following sorting algorithms is in-place?
(A) Merge Sort
(B) Quick Sort
(C) Bubble Sort
(D) All of the above

15. : What type of sorting algorithm is Heap Sort?
(A) Comparison-based
(B) Non-comparison-based
(C) Stable
(D) Adaptive

16. : In Quick Sort, what is the role of the pivot?
(A) To partition the array
(B) To sort the array
(C) To merge two arrays
(D) To perform linear searches

17. : What is the best-case time complexity of Insertion Sort?
(A) O(n²)
(B) O(n log n)
(C) O(n)
(D) O(log n)

18. : Which sorting algorithm is characterized by dividing the array into subarrays and sorting them independently?
(A) Quick Sort
(B) Merge Sort
(C) Bubble Sort
(D) Selection Sort

19. : What is the primary advantage of Heap Sort?
(A) It is stable
(B) It uses less memory
(C) It is an in-place algorithm
(D) It is easy to implement

20. : Which algorithm is not a comparison-based sorting algorithm?
(A) Radix Sort
(B) Quick Sort
(C) Merge Sort
(D) Bubble Sort

21. : In which scenario is Selection Sort most efficient?
(A) When the dataset is small
(B) When the dataset is large
(C) When the dataset is mostly sorted
(D) When the dataset contains many duplicates

22. : What is the worst-case time complexity of Quick Sort?
(A) O(n log n)
(B) O(n²)
(C) O(n)
(D) O(log n)

23. : Which sorting algorithm is known for its simplicity and ease of implementation?
(A) Merge Sort
(B) Quick Sort
(C) Bubble Sort
(D) Heap Sort

24. : What is the time complexity of Counting Sort?
(A) O(n²)
(B) O(n log n)
(C) O(n)
(D) O(log n)

25. : Which algorithm is not stable?
(A) Insertion Sort
(B) Merge Sort
(C) Quick Sort
(D) Bubble Sort

26. : What is the main disadvantage of Bubble Sort?
(A) It is difficult to implement
(B) It has a high time complexity
(C) It requires extra memory
(D) It is not stable

27. : What type of data does Radix Sort operate on?
(A) Integer data
(B) Character data
(C) Floating-point data
(D) All of the above

28. : Which sorting algorithm divides the data into buckets and sorts them individually?
(A) Radix Sort
(B) Merge Sort
(C) Heap Sort
(D) Quick Sort

29. : In which sorting algorithm is the data divided into halves recursively?
(A) Insertion Sort
(B) Quick Sort
(C) Merge Sort
(D) Selection Sort

30. : What is the key advantage of Merge Sort over Quick Sort?
(A) Faster execution time
(B) Lower space complexity
(C) It is always stable
(D) It has a better average-case performance

31. : Which sorting algorithm repeatedly selects the smallest element from an unsorted portion?
(A) Bubble Sort
(B) Insertion Sort
(C) Selection Sort
(D) Quick Sort

32. : What is the time complexity of Shell Sort?
(A) O(n log n)
(B) O(n²)
(C) O(n^(3/2))
(D) O(log n)

33. : Which of the following is a characteristic of Heap Sort?
(A) It is not an in-place algorithm
(B) It is stable
(C) It uses a binary heap data structure
(D) It is based on the divide-and-conquer strategy

34. : What is the primary purpose of the partitioning step in Quick Sort?
(A) To combine sorted arrays
(B) To rearrange elements around a pivot
(C) To select the next pivot
(D) To merge two halves

35. : Which of the following algorithms has a time complexity of O(n²) in the worst case?
(A) Merge Sort
(B) Heap Sort
(C) Quick Sort
(D) Selection Sort

36. : What is the primary advantage of using Counting Sort?
(A) It works on any data type
(B) It is a non-comparison-based algorithm
(C) It is stable
(D) It has low memory requirements

37. : In which sorting algorithm does the input size significantly affect the time complexity?
(A) Merge Sort
(B) Quick Sort
(C) Insertion Sort
(D) Bubble Sort

38. : Which sorting algorithm is best suited for sorting linked lists?
(A) Merge Sort
(B) Quick Sort
(C) Bubble Sort
(D) Heap Sort

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By: Prof. Dr. Fazal Rehman | Last updated: May 15, 2025

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