Bubble sort MCQs – T4Tutorials.com

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1. : What is Bubble Sort primarily used for?
(A) To search for an element
(B) To sort an array
(C) To merge two arrays
(D) To partition data

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

3. : Which statement best describes the working of Bubble Sort?
(A) It selects the smallest element and swaps it to the front.
(B) It compares adjacent elements and swaps them if they are in the wrong order.
(C) It divides the array into two halves and sorts them independently.
(D) It uses a divide-and-conquer approach to sort the array.

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

5. : In which scenario is Bubble Sort most efficient?
(A) When the data is already sorted
(B) When the data is in random order
(C) When the data has many duplicates
(D) When the data is large

6. : How many passes does Bubble Sort typically require to sort an array?
(A) n
(B) n/2
(C) n−1
(D) n²

7. : What is the space complexity of Bubble Sort?
(A) O(1)
(B) O(n)
(C) O(n log n)
(D) O(n²)

8. : Which of the following is true about Bubble Sort?
(A) It is a stable sorting algorithm.
(B) It is not a stable sorting algorithm.
(C) It can sort data in descending order only.
(D) It uses additional memory for sorting.

9. : What happens when a single pass of Bubble Sort completes without any swaps?
(A) The array is not sorted yet.
(B) The algorithm continues to the next pass.
(C) The algorithm terminates early, indicating that the array is sorted.
(D) The algorithm starts over from the beginning.

10. : Which of the following is a drawback of Bubble Sort?
(A) It is difficult to implement.
(B) It has a high time complexity for large datasets.
(C) It does not handle negative numbers.
(D) It requires extra memory for sorting.

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

12. : Which of the following algorithms is similar in nature to Bubble Sort?
(A) Selection Sort
(B) Merge Sort
(C) Quick Sort
(D) Insertion Sort

13. : In Bubble Sort, what is the main factor that determines whether two elements are swapped?
(A) Their values
(B) Their indices
(C) Their positions in the array
(D) Their data types

14. : How can Bubble Sort be optimized?
(A) By using a hash table
(B) By reducing the number of passes
(C) By stopping when no swaps occur in a pass
(D) By using a recursive approach

15. : What is the output of Bubble Sort if the input array is [5, 4, 3, 2, 1]?
(A) [1, 2, 3, 4, 5]
(B) [5, 4, 3, 2, 1]
(C) [3, 2, 1, 5, 4]
(D) [1, 5, 4, 3, 2]

16. : Which of the following is a practical application of Bubble Sort?
(A) Sorting large datasets
(B) Real-time data processing
(C) Educational purposes to teach sorting algorithms
(D) Data encryption

17. : What is the significance of the inner loop in Bubble Sort?
(A) It counts the number of swaps.
(B) It compares adjacent elements.
(C) It iterates through the entire array.
(D) It sorts the array in descending order.

18. : In Bubble Sort, how are elements compared?
(A) By their values
(B) By their positions
(C) By their frequencies
(D) By their types

19. : Which is true about the stability of Bubble Sort?
(A) It is unstable for equal elements.
(B) It maintains the relative order of equal elements.
(C) It can sort data with different data types.
(D) It requires additional space for stability.

20. : What will happen if Bubble Sort is applied to an array with only one element?
(A) The array will be sorted.
(B) An error will occur.
(C) The array will remain unchanged.
(D) The algorithm will loop indefinitely.

21. : Which of the following statements about Bubble Sort is incorrect?
(A) It can be implemented using recursion.
(B) It is an efficient algorithm for large datasets.
(C) It is a comparison-based sorting algorithm.
(D) It is simple to understand and implement.

22. : What does it mean when we say that Bubble Sort is a “comparison sort”?
(A) It uses comparisons to determine the order of elements.
(B) It sorts data without comparing values.
(C) It requires multiple passes to sort.
(D) It can only sort numerical data.

23. : What is the main idea behind the name “Bubble Sort”?
(A) Elements “bubble” to the top of the array.
(B) It uses bubble-like structures to sort.
(C) It is a type of floating sort.
(D) It sorts elements based on their sizes.

24. : How does Bubble Sort handle duplicate elements?
(A) It ignores them.
(B) It sorts them randomly.
(C) It maintains their relative order.
(D) It moves them to the end.

25. : What happens to the time complexity of Bubble Sort when the dataset is mostly sorted?
(A) It remains O(n²).
(B) It improves to O(n).
(C) It becomes O(log n).
(D) It increases to O(n log n).

26. : In which programming construct is Bubble Sort commonly implemented?
(A) Recursion
(B) Iteration
(C) Dynamic programming
(D) Greedy algorithms

27. : Which of the following sorting algorithms is generally less efficient than Bubble Sort?
(A) Insertion Sort
(B) Selection Sort
(C) Merge Sort
(D) Quick Sort

28. : What would be the result of applying Bubble Sort to the array [1, 2, 3, 4, 5]?
(A) [1, 2, 3, 4, 5]
(B) [5, 4, 3, 2, 1]
(C) [3, 1, 2, 4, 5]
(D) [2, 1, 3, 4, 5]

29. : Which sorting method is often taught as an introductory algorithm in computer science?
(A) Quick Sort
(B) Merge Sort
(C) Bubble Sort
(D) Heap Sort

30. : What is the impact of using a modified version of Bubble Sort that stops when no swaps are made in a pass?
(A) It becomes unstable.
(B) It improves efficiency for partially sorted data.
(C) It requires more memory.
(D) It makes the algorithm complex.

31. : Which of the following scenarios would likely result in the most number of comparisons when using Bubble Sort?
(A) Sorted array
(B) Reverse sorted array
(C) Randomized array
(D) Array with all equal elements

32. : What is the main reason why Bubble Sort is not commonly used in practice for large datasets?
(A) It is too complex to implement.
(B) It is too slow compared to more efficient algorithms.
(C) It does not maintain stability.
(D) It requires too much memory.

33. : How does the number of comparisons in Bubble Sort relate to the size of the array?
(A) It increases linearly.
(B) It increases quadratically.
(C) It decreases with larger sizes.
(D) It remains constant.

34. : What kind of sorting is Bubble Sort classified as?
(A) In-place sorting
(B) External sorting
(C) Comparison-based sorting
(D) All of the above

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

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