MCQs

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Overall MCQs for Reference

Which of the following is a common application of the queue data structure in operating systems?
a. Memory allocation
b. Process scheduling
c. Data encryption
d. Garbage collection
Answer: b. Process schedulinggeeksforgeeks+2
Which queue variant is most commonly used in round-robin CPU scheduling?
a. Simple Queue
b. Priority Queue
c. Circular Queue
d. Double-ended Queue
Answer: c. Circular Queuetestbook+1
Why are queues used in breadth-first search (BFS) in graphs?
a. To process nodes in reverse order
b. To process nodes in FIFO order
c. To process only leaf nodes
d. To skip duplicate nodes
Answer: b. To process nodes in FIFO ordercipherschools+2
Which of these is a direct real-life example of a queue?
a. Stack of plates
b. Printer job management
c. Dictionary lookup
d. Binary search
Answer: b. Printer job managementshiksha+3
A queue in networking devices helps to:
a. Ensure message encryption
b. Manage packet scheduling
c. Enforce referential integrity
d. Manage recursive data
Answer: b. Manage packet schedulinggeeksforgeeks+2
In customer service applications, queues are used to:
a. Prioritize VIP customers only
b. Ensure first-come, first-served processing
c. Encrypt customer data
d. Randomly serve customers
Answer: b. Ensure first-come, first-served processingccbp+2
Which application uses priority queue for efficient resource distribution?
a. Web browsing history
b. Dijkstra’s shortest path algorithm
c. Image rendering
d. Round-robin scheduling
Answer: b. Dijkstra’s shortest path algorithmgetsdeready+2
Which queue type allows insertion and deletion from both ends?
a. Simple Queue
b. Priority Queue
c. Deque
d. Circular Queue
Answer: c. Dequetestbook+1
Producer-consumer problems typically use queues to:
a. Enable LIFO processing
b. Synchronize data transfer between tasks
c. Filter incoming data
d. Sort numbers
Answer: b. Synchronize data transfer between taskswebrewrite+2
Which core queue operation removes an element from the front?
a. Insert
b. Push
c. Dequeue
d. Enqueue
Answer: c. Dequeuegeeksforgeeks+2
In data science, task scheduling in distributed processing is managed using:
a. Trees
b. Queues
c. Graphs
d. Heaps
Answer: b. Queueswebrewrite+2
Queues can be used in simulations for:
a. Direct memory access
b. Event scheduling
c. Compiling code
d. Sorting algorithms
Answer: b. Event schedulingshiksha+2
Which data structure is ideal for “First In, First Out” management of data streams?
a. Stack
b. Queue
c. Heap
d. Tree
Answer: b. Queuegeeksforgeeks+1
Printer spooling relies on a queue because:
a. All jobs need to print simultaneously
b. Jobs must be processed in arrival order
c. Jobs are prioritized by their owner
d. Printing is a LIFO process
Answer: b. Jobs must be processed in arrival orderheycoach+3
Within web servers, queues help to manage:
a. Client authentication
b. Incoming requests in FIFO order
c. Outgoing emails only
d. Cached data
Answer: b. Incoming requests in FIFO orderccbp+1
In parallel computing, queues are used to:
a. Manage thread pools
b. Encrypt all computation results
c. Store static constants
d. Minimize memory usage
Answer: a. Manage thread poolsgeeksforgeeks+1
Which algorithm uses a queue to explore all neighbor nodes at the present depth before moving to nodes at the next depth level?
a. Depth-First Search
b. Breadth-First Search
c. Binary Search
d. Selection Sort
Answer: b. Breadth-First Searchtestbook+2
Double-ended queues (deques) are especially useful in:
a. Stack operations only
b. Undo/redo operations in applications
c. Memory leak detection
d. Hashing processes
Answer: b. Undo/redo operations in applicationsshiksha
Which of the following queue types is usually found in process scheduling and job scheduling systems?
a. Stack
b. Simple Queue
c. Circular Queue
d. Binary Tree
Answer: c. Circular Queuetestbook+1
What role does a queue play in the implementation of call center systems?
a. Encrypts calls
b. Balances loads across servers
c. Holds calls in line for agents
d. Records calls only
Answer: c. Holds calls in line for agentscipherschools+2
Which variant of the queue is adapted to organize top-k elements in streaming data?
a. Simple queue
b. Priority queue
c. Circular queue
d. Stack
Answer: b. Priority queuegetsdeready+1
Queues are used in bank customer management systems to:
a. Encrypt customer credentials
b. Serve customers in arrival order
c. Allocate different currencies
d. Merge multiple accounts
Answer: b. Serve customers in arrival orderheycoach+1
In message queue services like Kafka or RabbitMQ, queues:
a. Encrypt messages only
b. Ensure reliable asynchronous message delivery
c. Decrypt messages before delivery
d. Guarantee message loss after reading
Answer: b. Ensure reliable asynchronous message deliverywebrewrite+1
Which structure handles batch data processing and jobs awaiting execution?
a. Hash Table
b. Queue
c. Stack
d. Heap
Answer: b. Queueccbp+2
In network routing protocols, queues manage:
a. Encryption of channel data
b. Packet order during congestion
c. Only broadcast packets
d. Unsolicited messages
Answer: b. Packet order during congestioncipherschools+1
Web browser session history can use which queue-based structure?
a. Priority queue
b. Stack
c. Deque
d. B-tree
Answer: c. Dequeshiksha
Which queue-based implementation helps in rate-limiting network requests?
a. Min heap
b. Circular queue
c. AVL Tree
d. Priority queue
Answer: b. Circular queuegeeksforgeeks+1
Resource allocation in cloud computing infrastructure is commonly managed by:
a. Deque
b. Stack
c. Queue
d. Linked list
Answer: c. Queueccbp+2
Palindrome checking in string processing can leverage:
a. Stack only
b. Stack and deque
c. Queue only
d. Tree structures
Answer: b. Stack and dequetestbook+1
When a queue is used as a buffer between two processes, this is called:
a. Direct memory access
b. Asynchronous data transfer
c. Recursive data management
d. Random data sampling
Answer: b. Asynchronous data transferwebrewrite+2
Which scheduling application requires an efficient queue to manage job priorities?
a. Breadth-first traversal
b. Disk scheduling
c. Quick sort
d. Linked list traversal
Answer: b. Disk schedulingwebrewrite+2
The undo operation in a text editor is efficiently handled by:
a. Queue
b. Deque
c. Graph
d. Heap
Answer: b. Dequeshiksha
Which queue variant can be used as a ring buffer for streaming data?
a. Priority queue
b. Circular queue
c. Deque
d. Sorted queue
Answer: b. Circular queueshiksha
In airline reservation systems, queues help to:
a. Randomly assign seats
b. Manage waiting lists
c. Encrypt passenger data
d. Merge duplicate reservations
Answer: b. Manage waiting listsheycoach+1
Which structure is used when nodes to be processed need dynamic prioritization?
a. Simple queue
b. Priority queue
c. Circular queue
d. Linked list
Answer: b. Priority queuegetsdeready+1
For email systems, one key use of queues is:
a. Scheduling outgoing emails in FIFO order
b. Encrypting emails at rest
c. Filtering unwanted messages
d. Parsing email content
Answer: a. Scheduling outgoing emails in FIFO ordergeeksforgeeks+1
In railway reservation systems, queue helps in:
a. Identifying available trains
b. Managing waitlisted tickets
c. Displaying train timings
d. Providing travel suggestions
Answer: b. Managing waitlisted ticketsheycoach+1
Data compression algorithms such as Huffman coding use:
a. Simple queues
b. Priority queues
c. Circular queues
d. Stacks
Answer: b. Priority queuesshiksha
The usage of queues in event-driven systems is best described as:
a. Protecting memory from overflow
b. Processing all events in their sequence of occurrence
c. Sorting events by types
d. Restructuring event logs
Answer: b. Processing all events in their sequence of occurrenceccbp+2
In multiprocessing scheduling, a queue mainly:
a. Stores function values
b. Allocates processors to jobs in FIFO order
c. Minimizes memory leak
d. Sorts data by size
Answer: b. Allocates processors to jobs in FIFO ordergeeksforgeeks+1
OS-level print spooling uses which data structure to organize jobs submitted by users?
a. B-tree
b. Stack
c. Queue
d. Heap
Answer: c. Queueherovired+2
First Come First Serve scheduling is directly implemented using:
a. Stack
b. Queue
c. Tree
d. Array
Answer: b. Queuewebrewrite+2
Which structure is heavily employed in real-time sensor data accumulation?
a. Stack
b. Queue
c. Graph
d. AVL Tree
Answer: b. Queuegeeksforgeeks+1
Which of the following is not a standard queue operation?
a. Dequeue
b. Enqueue
c. Sort
d. Peek
Answer: c. Sortgeeksforgeeks
Data ingestion pipelines in data science platforms use queues to:
a. Always prioritize smallest files
b. Stage data records for sequential or distributed processing
c. Randomly sample incoming records
d. Remove duplicates before further processing
Answer: b. Stage data records for sequential or distributed processingccbp+2
Queues in operating systems can help avoid:
a. Infinite loops in recursion
b. Deadlocks in process scheduling
c. Starvation by ensuring fair resource allocation
d. Binary tree balancing issues
Answer: c. Starvation by ensuring fair resource allocationccbp+2
Which of the following is a FIFO structure used for file I/O operations?
a. Stack
b. Queue
c. Hash map
d. Graph
Answer: b. Queuewebrewrite+1
The process of data packets waiting for network transmission utilizes:
a. Queue
b. Stack
c. Heap
d. Tree
Answer: a. Queuecipherschools+1
In simulation modeling for traffic systems, queues help to:
a. Assign speed limits automatically
b. Manage vehicles at intersections and toll booths
c. Predict weather conditions
d. Track vehicle emissions
Answer: b. Manage vehicles at intersections and toll boothsshiksha+1
Why are queues preferable for job scheduling in large-scale distributed systems?
a. They automatically compress data
b. They allow easy cancellation of jobs
c. They ensure fairness and efficient throughput
d. They randomize execution order
Answer: c. They ensure fairness and efficient throughputccbp+2

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