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CSS MCQs

Civil Superior Services — Complete MCQ Bank

899 Questions
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CSS is Pakistan’s premier federal competitive examination. Strong preparation requires conceptual clarity, broad general knowledge and consistent practice across compulsory and optional areas.

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271
Computer Science Medium

Which bus is primarily responsible for transferring data between the CPU and memory?

  • AAddress Bus
  • BExpansion Bus
  • CControl Bus
  • DData Bus
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Correct Answer: Option D — Data Bus
Explanation: The Data Bus is used to transfer actual data between the CPU, memory, and other hardware components. It carries information in both directions, allowing the processor to read data from memory and write data back to it. The width of the data bus affects how much data can be transferred at one time, influencing overall system performance and speed.
Submitted by: Chandi
272
Computer Science Medium

Which sorting algorithm generally provides the best average-case performance for large datasets?

  • AQuick Sort
  • BMerge Sort
  • CBubble Sort
  • DSelection Sort
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Correct Answer: Option A — Quick Sort
Explanation: Quick Sort is often considered the fastest sorting algorithm in the average case because it has an average time complexity of O(n log n) and requires relatively low memory. It works by selecting a pivot element and partitioning the array into smaller subarrays. Although its worst-case complexity is O(n²), careful pivot selection usually results in very efficient performance in real-world applications.
Submitted by: Chandi
273
Computer Science Medium

Which memory type is most commonly used to store firmware in embedded systems?

  • ARAM
  • BVirtual Memory
  • CCache Memory
  • DROM
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Correct Answer: Option D — ROM
Explanation: ROM (Read-Only Memory) is commonly used to store firmware in embedded systems because it retains data even when power is turned off. Firmware contains essential instructions required for hardware initialization and operation. Unlike RAM, ROM provides non-volatile storage, making it reliable for permanent system software and device control programs.
Submitted by: Chandi
274
Computer Science Medium

Who co-invented the World Wide Web (WWW) alongside Robert Cailliau?

  • ATom Berners
  • BMark Zuckerberg
  • CTim Berners-Lee
  • DBill Gates
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Correct Answer: Option C — Tim Berners-Lee
Explanation: Tim Berners-Lee, together with Robert Cailliau, played a key role in developing the World Wide Web at CERN in 1989. Berners-Lee created fundamental web technologies such as HTML, HTTP, and the first web browser. Their work transformed the internet into a user-friendly system for sharing and accessing information worldwide.
Submitted by: Chandi
275
Computer Science Medium

Who is widely regarded as the father of Computer Science?

  • AJohn von Neumann
  • BAlan Turing
  • CCharles Babbage
  • DBill Gates
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Correct Answer: Option B — Alan Turing
Explanation: Alan Turing is widely known as the father of Computer Science because he developed the theoretical foundation of modern computing. In 1936, he introduced the concept of the Turing Machine, which demonstrated how computers can process information and solve problems through algorithms. His work also played a major role in the development of artificial intelligence and computer theory, making him one of the most influential figures in computing history.
Submitted by: Chandi
276
Computer Science Medium

What is the default port number for HTTPS?

  • A21
  • B25
  • C80
  • D443
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Correct Answer: Option D — 443
Explanation: HTTPS (HyperText Transfer Protocol Secure) uses port 443 by default to provide secure communication over the Internet. It encrypts data using SSL/TLS protocols, protecting sensitive information such as passwords, banking details, and personal data from attackers
Submitted by: PaperMCQs
277
Current Affairs Medium

Which Pakistani institution coordinates national vaccination and immunization programs against childhood diseases?

  • AExpanded Programme on Immunization
  • BNDMA
  • CNADRA
  • DMinistry of Health alone
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Correct Answer: Option A — Expanded Programme on Immunization
Explanation: The Expanded Programme on Immunization EPI coordinates national vaccination campaigns against childhood diseases including polio measles and other preventable illnesses across Pakistan.
Submitted by: PaperMCQs
278
Current Affairs Hard

Which Pakistan-Turkey joint naval exercise reflects growing defense ties between the two nations?

  • AAtlas Exercise
  • BAman Exercise
  • CIndus Shield
  • DShaheen Series
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Correct Answer: Option B — Aman Exercise
Explanation: Pakistan participates in joint naval drills with Turkey as part of broader bilateral defense cooperation efforts reflecting deepening military ties between the two allied nations.
Submitted by: PaperMCQs
279
Current Affairs Hard

Which joint military exercise between Pakistan and Saudi Arabia demonstrates bilateral defense cooperation?

  • AAl-Samsaam
  • BIndus Shield
  • CShaheen Series
  • DAman Exercise
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Correct Answer: Option A — Al-Samsaam
Explanation: The Al-Samsaam joint military exercise between Pakistan and Saudi Arabia demonstrates strong bilateral defense cooperation and interoperability between the two countries' armed forces.
Submitted by: PaperMCQs
280
Current Affairs Medium

Which multinational naval exercise hosted by Pakistan brings together navies from across the world for maritime security cooperation?

  • AIndus Shield
  • BAman Exercise
  • CShaheen Series
  • DInspired Union
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Correct Answer: Option B — Aman Exercise
Explanation: The Aman Exercise hosted by the Pakistan Navy brings together naval forces from numerous countries to enhance maritime security cooperation and counter piracy collaboration in the region.
Submitted by: PaperMCQs
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