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CSS MCQs

Civil Superior Services — Complete MCQ Bank

899 Questions
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How to prepare for CSS

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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841
Computer Science Hard

Which programming paradigm focuses on functions and immutability?

  • AProcedural Programming
  • BObject-Oriented Programming
  • CFunctional Programming
  • DAssembly Programming
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Correct Answer: Option C — Functional Programming
Explanation: Functional programming emphasizes pure functions, immutability, and declarative problem solving.
Submitted by: PaperMCQs
842
Computer Science Medium

What is the purpose of a foreign key?

  • AStore passwords
  • BIdentify duplicate records
  • CCreate relationships between tables
  • DEncrypt database contents
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Correct Answer: Option C — Create relationships between tables
Explanation: Foreign keys enforce relationships between tables and maintain referential integrity.
Submitted by: PaperMCQs
843
Computer Science Medium

Which of the following is a NoSQL database?

  • AOracle
  • BMySQL
  • CMongoDB
  • DPostgreSQL
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Correct Answer: Option C — MongoDB
Explanation: MongoDB is a document-oriented NoSQL database designed for flexible and scalable data storage.
Submitted by: PaperMCQs
844
Computer Science Hard

What is a deadlock in an operating system?

  • AA memory leak
  • BA security attack
  • CA situation where processes wait indefinitely for resources
  • DA file corruption error
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Correct Answer: Option C — A situation where processes wait indefinitely for resources
Explanation: Deadlock occurs when processes are permanently blocked waiting for resources held by one another.
Submitted by: PaperMCQs
845
Computer Science Medium

What is the purpose of an index in a database?

  • AReduce security
  • BImprove query performance
  • CStore backups
  • DEncrypt records
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Correct Answer: Option B — Improve query performance
Explanation: Indexes improve retrieval speed by allowing databases to locate records efficiently.
Submitted by: PaperMCQs
846
Computer Science Hard

Which topology provides the highest fault tolerance?

  • ABus
  • BStar
  • CRing
  • DMesh
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Correct Answer: Option D — Mesh
Explanation: Mesh topology offers multiple communication paths between nodes, providing excellent redundancy and fault tolerance.
Submitted by: PaperMCQs
847
Computer Science Medium

Which memory is fastest among the following?

  • AHard Disk
  • BRAM
  • CCache Memory
  • DROM
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Correct Answer: Option C — Cache Memory
Explanation: Cache memory stores frequently used data close to the CPU and is significantly faster than RAM.
Submitted by: PaperMCQs
848
Computer Science Hard

Which algorithm is commonly used to find the shortest path in a weighted graph?

  • ABubble Sort
  • BDijkstra's Algorithm
  • CBinary Search
  • DDepth First Search
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Correct Answer: Option B — Dijkstra's Algorithm
Explanation: Dijkstra's Algorithm finds shortest paths in weighted graphs with non-negative edge weights and is widely used in navigation systems.
Submitted by: PaperMCQs
849
Computer Science Medium

What is polymorphism in object-oriented programming?

  • AData hiding
  • BAbility of an object to take multiple forms
  • CMemory allocation
  • DDatabase indexing
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Correct Answer: Option B — Ability of an object to take multiple forms
Explanation: Polymorphism allows objects to be treated through a common interface while exhibiting different behaviors depending on their actual type.
Submitted by: PaperMCQs
850
Computer Science Medium

Which OSI layer is responsible for end-to-end communication?

  • ANetwork Layer
  • BData Link Layer
  • CTransport Layer
  • DSession Layer
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Correct Answer: Option C — Transport Layer
Explanation: The Transport Layer provides end-to-end communication, reliability, flow control, and error handling using protocols such as TCP and UDP.
Submitted by: PaperMCQs
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