
Unit1 : 4.Creating a merge sort program
Presentation
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Computers
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9th Grade
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Practice Problem
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Medium
Ala Jaber
Used 4+ times
FREE Resource
5 Slides • 10 Questions
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Multiple Choice
What is the first phase of a merge sort?
A. Swapping out-of-order neighbours
B. Repeatedly dividing the list into halves until single items remain
C. Picking the smallest and moving it to the front each time
D. Randomly shuffling, then checking order
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Multiple Choice
Which algorithm can often stop early when the list is already almost sorted (because no swaps happen in a pass)?
A. Merge sort
B. Bubble sort
C. Both
D. Neither
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Multiple Choice
For a very large, jumbled list, which algorithm usually finishes faster?
A. Merge sort
B. Bubble sort
C. Both the same
D. Neither can sort large lists
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Multiple Choice
Which description pairs each algorithm with its main idea?
A. Bubble: split in halves; Merge: swap neighbours
B. Bubble: compare/swap adjacent items; Merge: split list into halves then merge in order
C. Bubble: pick smallest and insert; Merge: random shuffle
D. Bubble: divide-and-conquer; Merge: pick-and-place
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Multiple Choice
Why is merge sort called a “divide and conquer” algorithm?
A. It swaps neighbours until no swaps are needed
B. It divides the list into smaller parts, processes them, then merges them back in order
C. It randomises the list to avoid worst cases
D. It always picks the smallest item and inserts it at the front
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Multiple Choice
In merge sort, which step is the conquer phase?
A. Splitting the list into halves repeatedly
B. Choosing a pivot and partitioning
C. Merging sorted sublists into one ordered list
D. Swapping adjacent items
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Multiple Choice
What is a real-world benefit of sorting data mentioned on the slide?
A. It helps you analyse/search quickly (e.g., find a song by artist)
B. It increases image colour depth
C. It automatically encrypts results
D. It always reduces file size
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Multiple Choice
To find what films were released in a given year most efficiently, which field should you sort by?
A. Runtime
B. Title (A–Z)
C. Viewer rating
D. Release year
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Multiple Choice
When does the algorithm stop splitting into sub-lists?
A. After a fixed number of splits
B. When a sub-list has length 1 (base case)
C. When the first item is smallest
D. When list length > 1
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Multiple Choice
What is the role of MERGE sub-list and SORT followed by REPEAT UNTIL list is sorted?
A. Compare and swap adjacent items
B. Pick the smallest and insert at the front
C. Combine sub-lists while ordering them until one fully sorted list remains
D. Randomly shuffle until order appears
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