Quicksort Multiple choice Questions and Answers (MCQs)

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Quicksort Multiple choice Questions and Answers (MCQs)

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Question 6 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Which is the safest method to choose a pivot element?
A
choosing a random element as pivot
B
choosing the first element as pivot
C
choosing the last element as pivot
D
median-of-three partitioning method
Question 6 Explanation: 
This is the safest method to choose the pivot element since it is very unlikely that a random pivot would consistently provide a poor partition.

Question 7 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
What is the average running time of a quick sort algorithm?
A
O(N2)
B
O(N)
C
O(N log N)
D
O(log N)
Question 7 Explanation: 
The best case and average case analysis of a quick sort algorithm are mathematically found to be O(N log N).

Question 8 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Which of the following sorting algorithms is used along with quick sort to sort the sub arrays?
A
Merge sort
B
Shell sort
C
Insertion sort
D
Bubble sort
Question 8 Explanation: 
Insertion sort is used along with quick sort to sort the sub arrays.

It is used only at the end.

Question 9 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
Quick sort uses join operation rather than merge operation.
A
true
B
false
Question 9 Explanation: 
Quick sort uses join operation since join is a faster operation than merge.

Question 10 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
How many sub arrays does the quick sort algorithm divide the entire array into?
A
one
B
two
C
three
D
four
Question 10 Explanation: 
The entire array is divided into two partitions, 1st sub array containing elements less than the pivot element and 2nd sub array containing elements greater than the pivot element.

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