Queue operations (enqueue, dequeue, front, rear) MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 14, 2025

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1. : What is a queue in data structures?





2. : Which operation adds an element to the rear of the queue?





3. : What happens when you dequeue an element from an empty queue?





4. : What is the time complexity of the enqueue operation in a queue implemented using an array with sufficient capacity?





5. : Which operation removes and returns the front element of the queue?





6. : What is the time complexity of the dequeue operation in a queue implemented using a linked list?





7. : Which operation returns the front element of the queue without removing it?





8. : What happens when you peek at the front element of an empty queue?





9. : What is the time complexity of the front operation in a queue?





10. : Which of the following statements is true about queue operations?





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





12. : In a queue, which operation modifies the size of the queue?





13. : What happens if you try to enqueue an element into a full queue (using an array implementation)?





14. : Which queue operation is used to check if a queue is empty?





15. : What is the space complexity of a queue operation?





16. : Which of the following statements is true about the queue data structure?





17. : What is the primary limitation of using an array to implement a queue?





18. : Which queue operation is responsible for decreasing the size of the queue?





19. : Which queue operation can be used to reverse the order of elements?





20. : In queue operations, what does the term “rear” refer to?





 

Data Structures MCQs

Basic Concepts
  1. Introduction to Data Structures
  2. Complexity Analysis MCQs
Linear Data Structures MCQs
  1. Arrays MCQs
  2. Linked Lists MCQs
  3. Stacks MCQs
  4. Queues MCQs
Non-Linear Data Structures MCQs
  1. Trees MCQs
  2. Heaps MCQs
  3. Graphs MCQs
Hashing MCQs MCQs
  1. Hash Tables
Sorting and Searching Algorithms MCQs 
  1. Sorting Algorithms MCQs
  2. Searching Algorithms MCQs
Miscellaneous
  1. Memory Management in data structures MCQs
  2. String Manipulation Algorithms MCQs
  1. Data Structures MCQs 1
  2. Data Structures MCQs 2
  3. Data Structures MCQs 3
  4. Data Structures MCQs 4
  5. Data Structures MCQs 5
  6. Stacks Solved MCQs
  7. Queues MCQs
  8. pointer mcqs
  9. Array MCQs
 

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