MCQs

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Overall MCQs for Reference

1. In server technology, which of the following best describes “synchronous” operations?
   a. Operations occur independently and in parallel
   b. Operations require completion in sequence, blocking subsequent tasks
   c. Operations do not require any timing coordination
   d. Operations always fail in the absence of a backup server
   Answer: b. Operations require completion in sequence, blocking subsequent tasksmendix+1
2. What is a key advantage of asynchronous processing on servers?
   a. Simpler code with fewer bugs
   b. Increased throughput with non-blocking architecture
   c. All tasks require strict sequential execution
   d. Lower CPU usage regardless of workload
   Answer: b. Increased throughput with non-blocking architectureredhat+1
3. Synchronous communication is best suited for:
   a. Real-time, interactive applications like video conferencing
   b. High-latency batch processing
   c. Non-critical background updates
   d. Offline data archival
   Answer: a. Real-time, interactive applications like video conferencingtestbook+2
4. Which of the following is an example of asynchronous communication in servers?
   a. Video conferencing
   b. Online gaming
   c. Email servers
   d. Telephonic conversations
   Answer: c. Email serverstestbook+2
5. In synchronous server operations, what happens if a task is delayed?
   a. The next task begins immediately
   b. All subsequent tasks are queued until completion
   c. The operation switches to asynchronous mode
   d. The task is ignored
   Answer: b. All subsequent tasks are queued until completionkoyeb+1
6. Which is NOT a benefit of synchronous server communication?
   a. Immediate feedback
   b. Real-time collaboration
   c. Flexibility for responses
   d. Increased social presence
   Answer: c. Flexibility for responsesbytebytego+1
7. Asynchronous processing in a server is especially suitable for:
   a. Long-running or parallelizable tasks
   b. Tasks needing strict order
   c. Simpler debugging
   d. Serial data transfer only
   Answer: a. Long-running or parallelizable taskssunscrapers+1
8. Which of the following is a disadvantage of asynchronous server design?
   a. High degree of code complexity
   b. Poor resource utilization
   c. Every task must block others
   d. Always higher latency than synchronous modes
   Answer: a. High degree of code complexitymendix+1
9. What is typically required for synchronous communication?
   a. Strict time synchronization between sender and receiver
   b. No clock synchronization at all
   c. Only one-way communication
   d. Random data transfer intervals
   Answer: a. Strict time synchronization between sender and receivergeeksforgeeks+1
10. Which protocol operation is inherently asynchronous by design?
    a. File upload using FTP
    b. HTTP request handled via AJAX using callback functions
    c. ARP broadcast
    d. Serial port data transfer using clocks
    Answer: b. HTTP request handled via AJAX using callback functionsonlineinterviewquestions+1
11. A main benefit of asynchronous server programming is:
    a. Lower memory requirements
    b. Allowing user interface responsiveness during I/O
    c. Enforced start-stop bits for each message
    d. Eliminating the need for error correction
    Answer: b. Allowing user interface responsiveness during I/Olearn.microsoft+1
12. In synchronous data transmission, information is sent:
    a. In form of bytes or characters with gaps
    b. Using start and stop bits for each unit
    c. In form of blocks or frames with constant intervals
    d. Without hardware support
    Answer: c. In form of blocks or frames with constant intervalscomputer+1
13. Which one of the following best describes “blocking” in synchronous operations?
    a. The server processes tasks only if a manual trigger is given
    b. A task must complete before the next task can start
    c. Multiple tasks execute simultaneously without waiting
    d. The server stops if one task fails
    Answer: b. A task must complete before the next task can startkoyeb+1
14. Which operation is most likely to be implemented as asynchronous on modern web servers?
    a. Reading a configuration file on startup
    b. Handling concurrent file upload requests from multiple clients
    c. Generating an error log entry
    d. Parsing a single line of local text
    Answer: b. Handling concurrent file upload requests from multiple clientslearn.microsoft+2
15. For which of the following scenarios would synchronous design be preferred in a server system?
    a. Strict transaction handling in database operations
    b. Real-time chat systems with large queues
    c. Publishing blog posts asynchronously
    d. Performing background virus scans
    Answer: a. Strict transaction handling in database operationsgeeksforgeeks+1
16. The main distinguishing feature of asynchronous transmission is:
    a. Use of block synchronization signals
    b. Randomized error-checking cycles
    c. No need for prior synchronization; uses start and stop bits
    d. Constant interval data sending
    Answer: c. No need for prior synchronization; uses start and stop bitscomputer+1
17. In which situation might synchronous processing introduce a major bottleneck?
    a. When processing multiple long-running independent I/O operations
    b. When handling single, short-duration tasks
    c. During system idle state
    d. While executing parallel microservices
    Answer: a. When processing multiple long-running independent I/O operationssunscrapers+1
18. Which of these technologies is used for asynchronous communication in server-client systems?
    a. Remote Procedure Call (RPC) with blocking stubs
    b. WebSockets sending messages independently
    c. Serial transmission with frame alignment
    d. Synchronous API endpoints with locks
    Answer: b. WebSockets sending messages independentlygeeksforgeeks+2
19. Why is asynchronous communication considered “non-blocking”?
    a. It avoids any communication between tasks
    b. It waits for each task to finish before another starts
    c. Operations do not depend on the completion of previous operations
    d. It places all jobs in an infinite loop
    Answer: c. Operations do not depend on the completion of previous operationsredhat+2
20. What is a primary risk associated with asynchronous server design?
    a. Data inconsistency if dependencies aren’t managed carefully
    b. Irrevocable real-time error correction
    c. Only supports single-threaded execution
    d. Always more expensive than synchronous
    Answer: a. Data inconsistency if dependencies aren’t managed carefullyredhat+2
21. Synchronous data transmission is more efficient for:
    a. Burst, sporadic data traffic
    b. Continuous, high-speed transfers
    c. Storing data offline
    d. Transaction logging only
    Answer: b. Continuous, high-speed transfersgeeksforgeeks+1
22. Which statement about synchronous requests in AJAX is true?
    a. Modern browsers recommend frequent synchronous requests for performance
    b. Synchronous requests can block the UI until a response is received
    c. Synchronous AJAX is always preferred for real-time interfaces
    d. Synchronous requests enable other code to execute in parallel
    Answer: b. Synchronous requests can block the UI until a response is receivedjavainuse+1
23. The term “time coupling” refers to:
    a. Both sender and receiver must be available simultaneously in synchronous systems
    b. Delayed message handling in asynchronous systems
    c. Server status monitoring
    d. Time-zone-dependent transmission
    Answer: a. Both sender and receiver must be available simultaneously in synchronous systemsbytebytego+1
24. Which of the following best exemplifies asynchronous transmission?
    a. Live multiplayer gaming requiring tight synchronization
    b. Data sent in discrete, start/stop framed units
    c. High-frequency multithreaded algorithmic tasks
    d. Uninterrupted streaming video
    Answer: b. Data sent in discrete, start/stop framed unitscomputer+1
25. What is an important tradeoff in using asynchronous communication in large-scale distributed systems?
    a. Guaranteed data consistency at all times
    b. Enhanced system speed but potentially delayed consistency
    c. Simplified transaction rollback
    d. Lowered programming skills required
    Answer: b. Enhanced system speed but potentially delayed consistencymendix+1
26. In asynchronous server communication, “latency” often refers to:
    a. Time taken to initiate a server process
    b. Delay between initiation and completion of independent tasks
    c. CPU temperature variations
    d. Power supply fluctuations
    Answer: b. Delay between initiation and completion of independent taskssunscrapers+1
27. Synchronous operations in a clustered server environment ensure:
    a. The sender waits for responses before continuing
    b. Data is always inconsistent between nodes
    c. No response acknowledgment is needed
    d. Tasks can be freely reordered for performance
    Answer: a. The sender waits for responses before continuingredhat
28. Which scenario below is most fitting for asynchronous server programming?
    a. Immediate error reporting for every user input
    b. Updating user dashboards in real time as transactions occur
    c. Processing queued emails in batches for later delivery
    d. Completing each upload before downloading begins
    Answer: c. Processing queued emails in batches for later deliverytestbook+1
29. What ensures real-time error detection and correction in synchronous transmission?
    a. Parity bit monitoring
    b. Synchronized clocks and frame continuity
    c. Random gap insertion
    d. User-triggered error checks
    Answer: b. Synchronized clocks and frame continuitygeeksforgeeks+1
30. Which is true of asynchronous server communication?
    a. Requires continuous connection to maintain session
    b. Sender and receiver do not need to be available at the same instant
    c. All transmissions must use hardware-level handshaking
    d. Suitable only for telephony applications
    Answer: b. Sender and receiver do not need to be available at the same instantgeeksforgeeks+2
31. In the context of WCF (Windows Communication Foundation), which method type is recommended for implementing asynchronous server operations?
    a. Callback interface implementation
    b. Task-based asynchronous pattern using Task<T>
    c. Synchronous event raising
    d. Class-level static initializers
    Answer: b. Task-based asynchronous pattern using Task<T>learn.microsoft
32. In which of the following do start and stop bits play a crucial role?
    a. Synchronous block data transmission
    b. Asynchronous character data transmission
    c. All types of message passing in servers
    d. Only encrypted traffic
    Answer: b. Asynchronous character data transmissioncomputer+1
33. Synchronous operations are generally:
    a. Better for single-threaded, dependent operations
    b. Always the fastest for large data transfers
    c. The only way to avoid memory leaks
    d. Preferred for massive distributed networks
    Answer: a. Better for single-threaded, dependent operationsmendix+1
34. A coding example for an asynchronous method in C# would use:
    a. return string in standard form
    b. public async Task<string> MethodAsync()
    c. static int MethodSync()
    d. void OnlyMethod()
    Answer: b. public async Task<string> MethodAsync()learn.microsoft
35. Which statement is false about asynchronous communication in server technology?
    a. Increases task concurrency
    b. Makes application logic substantially easier
    c. Can improve responsiveness in web apps
    d. May increase code complexity
    Answer: b. Makes application logic substantially easiersunscrapers+1
36. In data transmission, the main difference between synchronous and asynchronous is:
    a. Amount of transmitted data
    b. Timing coordination and synchronization
    c. Application-level protocol
    d. The use of encryption
    Answer: b. Timing coordination and synchronizationgeeksforgeeks+1
37. What is a major difficulty with debugging asynchronous code in server applications?
    a. Errors always occur at compile-time
    b. Unpredictable timing and call order
    c. Only supports single-threaded models
    d. Cannot use any breakpoints
    Answer: b. Unpredictable timing and call ordermendix+1
38. In server processing, asynchronous execution is notably useful when:
    a. Tasks involve user interaction and waiting for external result
    b. Transactions require strict sequentiality
    c. Only one client connects at a time
    d. No tasks require any form of waiting
    Answer: a. Tasks involve user interaction and waiting for external resultlearn.microsoft+1
39. Synchronous server communication is ideal for:
    a. Loose-coupled, distributed systems with high node failure tolerance
    b. Applications requiring step-by-step data integrity and validation
    c. Background batch jobs
    d. Low-frequency data logging
    Answer: b. Applications requiring step-by-step data integrity and validationredhat+1
40. Which element is most characteristic of asynchronous multi-client server systems?
    a. All responses are queued synchronously for each client
    b. Non-blocking request handling for independent tasks
    c. Responses must be broadcast to every client on completion
    d. Requests use only file system locks
    Answer: b. Non-blocking request handling for independent taskssunscrapers+1
41. Synchronous messaging in servers results in:
    a. Higher responsiveness for concurrent users
    b. Possible bottleneck if one transaction is delayed
    c. Infinite scalability with no extra checks
    d. No client-server handshake needed
    Answer: b. Possible bottleneck if one transaction is delayedmendix+1
42. When designing servers for mobile apps, asynchronous operations are favored because:
    a. Mobile connections are always stable, so synchronous works better
    b. They keep the application UI fluid despite network latency
    c. Asynchronous is always more secure
    d. Mobile apps require only one concurrent connection
    Answer: b. They keep the application UI fluid despite network latencylearn.microsoft+1
43. Which server-side technology commonly uses asynchronous execution to offload heavy I/O?
    a. Static HTML file serving
    b. Node.js event-driven applications
    c. Traditional CGI scripts
    d. BIOS firmware hooks
    Answer: b. Node.js event-driven applicationssanfoundry+1
44. What happens to overall system throughput in asynchronous server designs?
    a. Throughput remains constant regardless of concurrency
    b. Throughput often increases due to concurrent task processing
    c. Throughput declines as tasks are split
    d. Throughput is unrelated to architecture
    Answer: b. Throughput often increases due to concurrent task processingsunscrapers+1
45. Synchronous transmission in data networks is less ideal for:
    a. High-speed, continuous data streams
    b. Sporadic, user-driven actions
    c. Dedicated real-time voice communication
    d. Clustered high-availability systems
    Answer: b. Sporadic, user-driven actionscomputer+1
46. Which data loss scenario is more likely in asynchronous systems?
    a. When tasks fail to check for dependent updates
    b. When tasks are forced to run stepwise
    c. When using strictly synchronous error correction only
    d. When every node in a cluster is idle
    Answer: a. When tasks fail to check for dependent updatesredhat+1
47. In server APIs, which approach is best for background messaging?
    a. Synchronous message waits
    b. Asynchronous queued message handlers
    c. Real-time blocking for all clients
    d. Polling for responses only
    Answer: b. Asynchronous queued message handlersmendix+1
48. Which form of communication is ideal for flexibility and remote work in large teams?
    a. Synchronous only
    b. Asynchronous messaging like messaging apps and forums
    c. Only batch file transfer
    d. Single-threaded scripts
    Answer: b. Asynchronous messaging like messaging apps and forumstestbook+1
49. Which application is least compatible with asynchronous server processing?
    a. Multi-user collaborative document editing in real time
    b. Long-running data warehousing tasks
    c. Email delivery management
    d. Web app notifications
    Answer: a. Multi-user collaborative document editing in real timetestbook+1
50. Which is a direct consequence of using synchronous code in a highly concurrent server?
    a. Server scales for thousands of users by default
    b. Server blocks on each task, limiting parallel connections
    c. Memory usage drops dramatically
    d. All server requests are delivered instantly
    Answer: b. Server blocks on each task, limiting parallel connectionssunscrapers+1

1. https://www.mendix.com/blog/asynchronous-vs-synchronous-programming/
2. https://www.geeksforgeeks.org/computer-networks/difference-between-synchronous-and-asynchronous-transmission/
3. https://docs.redhat.com/en/documentation/red_hat_data_grid/6/html/administration_and_configuration_guide/asynchronous_and_synchronous_operations
4. https://testbook.com/objective-questions/mcq-on-synchronous–5eea6a1039140f30f369e889
5. https://www.geeksforgeeks.org/system-design/synchronous-vs-asynchronous-communication-system-design/
6. https://testbook.com/objective-questions/mcq-on-asynchronous–5eea6a1039140f30f369e88a
7. https://blog.bytebytego.com/p/synchronous-vs-asynchronous-communication
8. https://www.koyeb.com/blog/introduction-to-synchronous-and-asynchronous-processing
9. https://sunscrapers.com/blog/programming-async-vs-sync-best-approach/
10. https://www.computer.org/publications/tech-news/trends/synchronous-asynchronous-data-transmission/
11. https://www.onlineinterviewquestions.com/differentiate-between-synchronous-and-as/
12. https://www.javainuse.com/quiz/ajax
13. https://learn.microsoft.com/en-us/dotnet/framework/wcf/synchronous-and-asynchronous-operations
14. https://www.sanfoundry.com/javascript-mcqs-asynchronous-io-with-rhino/
15. https://study.com/academy/practice/quiz-worksheet-asynchronous-synchronous-transmission.html
16. https://www.sanfoundry.com/computer-networks-questions-answers-rpc/
17. https://examradar.com/data-communication-networking-transmission-digital-data-parallel-serial-synchronous-asynchronous-mcq/
18. https://www.geeksforgeeks.org/javascript/synchronous-and-asynchronous-programming/
19. https://javatechonline.com/java-microservices-mcq-questions/
20. https://www.watelectronics.com/mcq/asynchronous-counter/