Queue using Stacks Quiz Online Practice Test

1. A double-ended queue allows adding and removing items from both ends. Given only stacks with push and pop operations to implement this, how many stacks are needed (with reuse allowed)?

2. If you need to perform a dequeue operation using a stack of size n and m elements, what is the time complexity of the dequeue operation (using only push and pop operations)?

O(m)

O(n)

O(m*n)

Data is insufficient

3. Given an array of arbitrary size, you can perform a dequeue operation either using stack operations (push and pop) or queue operations (enqueue and dequeue). What is the difference between these approaches?

They will have different time complexities

The memory used will not be different

There are chances that output might be different

No differences

4. Given a stack with elements:

5 4 3 2 << top

where 2 is the top element, and you need to transform it to:

6 5 4 3 2 << top

using only push and pop operations, which sequence of operations should you perform?

Push(pop()), push(6), push(pop())

Push(pop()), push(6)

Push(pop()), push(pop()), push(6)

Push(6)

5. A double-ended queue allows adding and removing items from both ends, with operations like addFront, addRear, removeFront, and removeRear. If you use only stacks (with push and pop operations) to implement this structure, what is the time complexity for performing addFront and addRear operations, assuming m is the stack size and n is the number of elements?

O(m) and O(n)

O(1) and O(n)

O(n) and O(1)

O(n) and O(m)

6. Why is it challenging to implement stack operations using queues for a large dataset, where the number of elements is (n)?

Due to its time complexity of O(n)

Due to its time complexity of O(log n)

No extra memory is needed

There are no issues

7. Imagine you are on a planet with slow computational chips, and you have an array of size 10. To enqueue an element into this array, you can only use push and pop operations, each taking 1 second. What is the total time required to perform the enqueue operation?

20 seconds

40 seconds

42 seconds

43 seconds

8. You have two jars: one containing 10 rings and the other empty. The jars are stacked on top of each other, and you want to remove the last ring from the first jar. The second jar is fragile and cannot hold rings for long. How can you remove the last ring?

Transfer all rings from the first jar to the second jar, one by one

Transfer all rings from the first jar to the second jar, then move all rings back to the first jar, one by one

It is not possible to remove the last ring

Break the jar to remove the last ring

9. With only a single array of size 10 and no additional memory available, which of the following operations cannot be implemented using only push and pop operations?

Push

Pop

Enqueue

Return top

10. In an array of size (n), where an element is 'touched' whenever an operation is performed on it (such as the top element being touched during a pop), how many times will each element be touched during a dequeue operation?

At least once

At least twice

At least three times

At least four times

Test Name:	Queue using Stacks Quiz
Subject Category:	Computer Science
Test Type:	Multiple Choice Questions
Total Score / Questions:	10 / 10
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

Queue using Stacks MCQ Quiz Online Practice Test