Queues - Quiz | Analytics

Q: What are the two primary operations on a queue?

A. Push and pop
B. Insert and delete
C. Enqueue and dequeue
D. Sort and search

Correct Option: C
Explanation:

Answer: c) Enqueue and dequeue

Explanation: The two primary operations on a queue are enqueue, which adds an element to the rear end of the queue, and dequeue, which removes the element from the front end of the queue.

Q: Which of the following is a common problem that can be solved using a queue?

A. Sorting a list of integers
B. Finding the shortest path between two nodes in a graph
C. Evaluating arithmetic expressions in postfix notation
D. Implementing a binary search algorithm

Correct Option: B
Explanation:

Answer: b) Finding the shortest path between two nodes in a graph

Explanation

: A queue can be used to implement a breadth-first search algorithm, which is commonly used to find the shortest path between two nodes in a graph.

Q: What is the difference between a queue and a stack?

A. A queue follows the Last-In-First-Out (LIFO) principle, while a stack follows the First-In-First-Out (FIFO) principle.
B. A queue allows elements to be inserted and removed from both ends, while a stack only allows elements to be inserted and removed from one end.
C. A queue is typically implemented using a linked list, while a stack is typically implemented using an array.
D. A queue is used for breadth-first search algorithms, while a stack is used for depth-first search algorithms.

Correct Option: B
Explanation:

Answer: b) A queue allows elements to be inserted and removed from both ends, while a stack only allows elements to be inserted and removed from one end.

Explanation: The primary difference between a queue and a stack is that a queue allows elements to be inserted and removed from both ends, while a stack only allows elements to be inserted and removed from one end. Additionally, a queue follows the First-In-First-Out (FIFO) principle, while a stack follows the Last-In-First-Out (LIFO) principle.

Q: What is the time complexity of the enqueue and dequeue operations on a queue implemented using an array?

A. O(1)
B. O(log n)
C. O(n)
D. O(n log n)

Correct Option: A
Explanation:

Answer: a) O(1)

Explanation: The enqueue and dequeue operations on a queue implemented using an array have a time complexity of O(1), since they simply involve adding or removing an element from the beginning or end of the array.

Q: Which of the following is not a common application of a queue?

A. Processing tasks in the order they are received
B. Implementing a breadth-first search algorithm in a graph
C. Storing data in a database
D. Printing documents in the order they are sent to a printer

Correct Option: C
Explanation:

Answer: c) Storing data in a database

Explanation: While a queue can be used to store data temporarily in memory, it is not commonly used to store data in a database.

Q: What happens when you try to dequeue an element from an empty queue?

A. The queue remains unchanged
B. An error occurs
C. The front element is returned with no change to the queue
D. The rear element is returned with no change to the queue

Correct Option: B
Explanation:

Answer: b) An error occurs

Explanation: Dequeueing an element from an empty queue is considered an error since there is no element to remove.

Q: What is a queue in data structure?

A. A data structure that allows elements to be inserted and removed in any order
B. A data structure that allows elements to be inserted and removed from the beginning or end
C. A data structure that allows elements to be inserted and removed from one end only
D. A data structure that allows elements to be inserted at one end and removed from the other end

Correct Option: D
Explanation:

Answer: d) A data structure that allows elements to be inserted at one end and removed from the other end

Explanation: A queue is a data structure that follows the First-In-First-Out (FIFO) principle, meaning that the element that is inserted first will be the first to be removed. It allows elements to be inserted at one end (rear end) and removed from the other end (front end).

Q: Which of the following is an advantage of using a queue?

A. It allows for efficient insertion and deletion at any position
B. It allows for efficient searching and sorting of elements
C. It follows the Last-In-First-Out (LIFO) principle
D. It allows for efficient insertion and deletion at both ends

Correct Option: D
Explanation:

Answer: d) It allows for efficient insertion and deletion at both ends

Explanation: The primary advantage of using a queue is that it allows for efficient insertion and deletion at both ends, making it useful for applications that require temporary storage of data in a specific order.

Q: Which of the following is not a type of queue?

A. Priority queue
B. Circular queue
C. Double-ended queue
D. Binary queue

Correct Option: D
Explanation:

Answer: d) Binary queue

Explanation: A binary queue is not a type of queue in data structure. Instead, it is a term used in computer science to describe a data structure that is similar to a binary heap.

Q: Which data structure is commonly used to implement a queue?

A. Array
B. Linked list
C. Binary tree
D. Hash table

Correct Option: B
Explanation:

Answer: b) Linked list

Explanation: A linked list is commonly used to implement a queue since it allows for efficient insertion and deletion at both ends of the list.