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CSS MCQs

Civil Superior Services — Complete MCQ Bank

53 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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51
Computer Science Medium

Which layer of the OSI model is responsible for routing packets?

  • ATransport Layer
  • BNetwork Layer
  • CSession Layer
  • DPresentation Layer
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Correct Answer: Option B — Network Layer
Explanation: The Network Layer is responsible for logical addressing and routing of packets between networks. Protocols such as IP operate at this layer, enabling data to travel across interconnected networks efficiently.
Submitted by: PaperMCQs
52
Computer Science Medium

Which data structure follows the Last In First Out (LIFO) principle?

  • AQueue
  • BArray
  • CStack
  • DLinked List
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Correct Answer: Option C — Stack
Explanation: A stack follows the Last In First Out principle, meaning the most recently added element is removed first. Stacks are widely used in function calls, recursion, expression evaluation, and memory management.
Submitted by: PaperMCQs
53
Computer Science Medium

Which programming language is known as the "mother of all languages"?

  • APython
  • BJava
  • CC
  • DFORTRAN
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Correct Answer: Option C — C
Explanation: C programming language is often called the "mother of all languages" because many modern programming languages like C++, Java, and Python are derived from or influenced by C.
Submitted by: PaperMCQs
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