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Overall MCQs for Reference
- Which operation inserts an element at the rear of a queue?
a. Enqueue
b. Dequeue
c. Peek
d. Push
Answer: a. Enqueuesanfoundry+1 - What does FIFO stand for in the context of queues?
a. First In, First Out
b. First In, Finally Out
c. Fast In, Fast Out
d. Fastest In, First Out
Answer: a. First In, First Outgeeksforgeeks+2 - Which of the following removes an element from the front of a queue?
a. Push
b. Pop
c. Enqueue
d. Dequeue
Answer: d. Dequeuew3schools+1 - In which data structure are all elements added at one end and removed from the other?
a. Stack
b. Queue
c. Tree
d. Graph
Answer: b. Queuebyjus+2 - What is the time complexity of enqueue operation in a simple queue implemented using an array?
a. O(1)
b. O(n)
c. O(log n)
d. O(n log n)
Answer: a. O(1)sanfoundry+1 - What is the main disadvantage of a simple queue using arrays?
a. Easy implementation
b. Inefficient memory usage
c. Slow dequeue
d. Limited element types
Answer: b. Inefficient memory usagegeeksforgeeks+1 - Which of the following is NOT a common operation in a queue?
a. Enqueue
b. Dequeue
c. Peek
d. Shuffle
Answer: d. Shufflestudiestoday+1 - Which data structure is used in Breadth-First Search (BFS)?
a. Stack
b. Queue
c. Heap
d. Tree
Answer: b. Queuegeeksforgeeks+1 - What is a circular queue primarily used for?
a. Minimize memory wastage
b. Increase stack size
c. Implement graphs
d. Decrease queue size
Answer: a. Minimize memory wastagebyjus+1 - What is the best way to implement a priority queue?
a. Linked List
b. Heap
c. Binary Tree
d. Stack
Answer: b. Heapstudiestoday - Which queue allows insertion and deletion from both ends?
a. Simple Queue
b. Priority Queue
c. Deque
d. Circular Queue
Answer: c. Dequegeeksforgeeks - What will be the content of a queue after the following operations: enqueue(3), enqueue(5), dequeue(), enqueue(7)?
a. 3, 5
b. 5, 7
c. 3, 5, 7
d. 7
Answer: b. 5, 7sanfoundry+1 - Which type of queue is used for CPU scheduling?
a. Simple Queue
b. Priority Queue
c. Circular Queue
d. Deque
Answer: b. Priority Queueshiksha+1 - What happens if both front and rear are -1 in an array implementation of a queue?
a. The queue is full
b. The queue is empty
c. The queue is half-full
d. Queue has two elements
Answer: b. The queue is emptysanfoundry+1 - Which operation checks if the queue has no elements?
a. isEmpty
b. isFull
c. isQueue
d. isValid
Answer: a. isEmptyw3schools+1 - In a queue, where is the new element inserted?
a. Front
b. Rear
c. Middle
d. Anywhere
Answer: b. Reargeeksforgeeks+2 - The circular queue prevents which problem of simple queue?
a. Stack overflow
b. Memory wastage
c. Slow push
d. Index loss
Answer: b. Memory wastagebyjus+1 - What does the dequeue operation in a queue do?
a. Inserts data
b. Removes data from the front
c. Displays the rear
d. Changes front pointer
Answer: b. Removes data from the frontsanfoundry+1 - Which queue type is useful for resource allocation in OS?
a. Stack
b. Priority Queue
c. Deque
d. Binary Tree
Answer: b. Priority Queuegeeksforgeeks+1 - For which requirement are queues NOT used?
a. Print spooling
b. Multithreading
c. Sorting
d. Task scheduling
Answer: c. Sortingccbp+2 - Which data structure supports the “first come first serve” principle?
a. Stack
b. Queue
c. Tree
d. Heap
Answer: b. Queuewikipedia+1 - What is the best data structure to buffer keystrokes coming from a keyboard?
a. Priority Queue
b. Simple Queue
c. Stack
d. Heap
Answer: b. Simple Queueshiksha+1 - A double-ended queue is also called a:
a. Priority Queue
b. Deque
c. Stack
d. Heap
Answer: b. Dequegeeksforgeeks - Which queue type allows dynamic memory management and prevents memory wastage?
a. Simple Queue
b. Circular Queue
c. Priority Queue
d. Deque
Answer: b. Circular Queuebyjus+1 - How are interruptions handled in hardware systems?
a. Stack
b. Queue
c. Array
d. Tree
Answer: b. Queuegeeksforgeeks+1 - A queue used for breadth-first traversal of a graph is:
a. Stack
b. Priority Queue
c. Simple Queue
d. Deque
Answer: c. Simple Queuegeeksforgeeks+1 - What is the worst case time complexity of dequeue operation in a simple queue using array?
a. O(1)
b. O(n)
c. O(log n)
d. O(n log n)
Answer: a. O(1)sanfoundry+1 - What will happen if you perform a dequeue on an empty queue?
a. Null
b. Underflow
c. Overflow
d. Stack error
Answer: b. Underflowsanfoundry+1 - What is the purpose of a queue in data streaming?
a. Sorting
b. Buffering
c. Searching
d. Indexing
Answer: b. Bufferingshiksha+1 - Which among these is NOT an application of queues?
a. Network traffic management
b. Task scheduling
c. Polynomial evaluation
d. Printer spooling
Answer: c. Polynomial evaluationccbp+2 - In a circular queue using array, what does the front pointer do when it reaches the last index after many enqueue/dequeue operations?
a. Stays there
b. Moves to index 0
c. Resets to rear
d. Becomes null
Answer: b. Moves to index 0geeksforgeeks+1 - If the queue follows FIFO, what does the rear pointer indicate?
a. Next removal
b. Next insertion
c. Next search
d. Next shuffle
Answer: b. Next insertionw3schools+1 - Which method would you use to view the oldest element in the queue without removing it?
a. Enqueue
b. Peek
c. Pop
d. Insert
Answer: b. Peekw3schools - Which queue is ideal for maintaining a playlist in a media player?
a. Simple Queue
b. Deque
c. Circular Queue
d. Priority Queue
Answer: a. Simple Queueshiksha - What does the priority queue give preference to?
a. First item
b. Highest priority
c. Random order
d. Last item
Answer: b. Highest prioritystudiestoday+1 - What condition shows that a simple queue using an array is full?
a. front == rear
b. rear == maxsize-1
c. front == maxsize-1
d. front == 0
Answer: b. rear == maxsize-1geeksforgeeks+1 - What is the advantage of a circular queue over a linear queue in array implementation?
a. Faster insertion
b. Memory efficiency
c. Simpler logic
d. Higher priority
Answer: b. Memory efficiencybyjus+1 - In real-time systems, queues help with:
a. Quick calculation
b. Interrupt handling
c. Tree balancing
d. Data replication
Answer: b. Interrupt handlinggeeksforgeeks+1 - Which kind of queue is designed for simulation models, like store checkouts?
a. Simple Queue
b. Deque
c. Simulation Queue
d. Priority Queue
Answer: a. Simple Queuegeeksforgeeks+1 - Which of the following describes “spooling” in printer operations?
a. Stack usage
b. Queue usage
c. Tree usage
d. Heap usage
Answer: b. Queue usageccbp+1 - What is a non-blocking queue useful for?
a. Deadlock
b. Concurrency
c. Sorting
d. Indexing
Answer: b. Concurrencyshiksha - Which is not true about queues?
a. They always maintain LIFO
b. FIFO is the main rule
c. Dequeue removes from front
d. New insertions at rear
Answer: a. They always maintain LIFOw3schools+1 - In breadth-first search, what is the primary role of the queue?
a. Process latest nodes
b. Track unhashed nodes
c. Maintain node order
d. Calculate path length
Answer: c. Maintain node ordergeeksforgeeks+1 - Which of the following operations cannot cause queue overflow?
a. Enqueue
b. Peek
c. Insert
d. None of the above
Answer: b. Peekw3schools - Which scheduling algorithm in OS is implemented using queue?
a. Round Robin
b. Binary Search
c. Quick Sort
d. Merge Sort
Answer: a. Round Robingeeksforgeeks+1 - What is the space complexity of a simple queue implemented with array of size n?
a. O(1)
b. O(n)
c. O(n log n)
d. O(2n)
Answer: b. O(n)sanfoundry+1 - Which of the following queues is used in router packet scheduling?
a. Priority Queue
b. Deque
c. Simple Queue
d. Circular Queue
Answer: c. Simple Queueshiksha - What is a queue when used in asynchronous data transfer?
a. Scheduler
b. Buffer
c. Parser
d. Tree
Answer: b. Buffergeeksforgeeks+1 - If rear = front in a circular queue, then the queue is:
a. Full
b. Half-full
c. Empty
d. Circular
Answer: c. Emptybyjus+1 - In which scenario are queues NOT the best fit?
a. FIFO needs
b. Priority processing
c. Random access required
d. Buffering
Answer: c. Random access requiredwikipedia+1
- https://www.sanfoundry.com/data-structure-questions-answers-queue-operations/
- https://www.w3schools.com/dsa/dsa_data_queues.php
- https://www.geeksforgeeks.org/dsa/queue-data-structure/
- https://en.wikipedia.org/wiki/Queue_(abstract_data_type)
- https://byjus.com/gate/queue-notes/
- https://www.geeksforgeeks.org/dsa/introduction-to-queue-data-structure-and-algorithm-tutorials/
- https://www.sanfoundry.com/data-structure-questions-answers-queue-array/
- https://www.studiestoday.com/mcq-computer-science-cuet-computer-science-mcqs-chapter-3-queue-491724.html
- https://www.geeksforgeeks.org/dsa/applications-of-queue-data-structure/
- https://www.shiksha.com/online-courses/articles/queue-data-structure-types-implementation-applications/
- https://www.ccbp.in/blog/articles/application-of-queue-in-data-structure
- https://testbook.com/objective-questions/mcq-on-queue–5eea6a1139140f30f369eb88
- https://www.geeksforgeeks.org/quizzes/top-mcqs-on-queue-data-structure-with-answers/
- https://webrewrite.com/mcq-on-data-structure-stack-and-queue/
- https://www.scribd.com/document/811797411/DS-MCQ
- https://www.youtube.com/watch?v=dz5bqyCXOwI
- https://www.interviewbit.com/data-structure-mcq/
- https://www.geeksforgeeks.org/dsa/applications-advantages-and-disadvantages-of-queue/
- https://herovired.com/learning-hub/blogs/queue-data-structures/
- https://interviewkickstart.com/blogs/interview-questions/data-structures-mcqs-answers
