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CSS MCQs

Civil Superior Services — Complete MCQ Bank

53 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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41
Computer Science Hard

Which topology provides the highest fault tolerance?

  • ABus
  • BStar
  • CRing
  • DMesh
Permalink
Correct Answer: Option D — Mesh
Explanation: Mesh topology offers multiple communication paths between nodes, providing excellent redundancy and fault tolerance.
Submitted by: PaperMCQs
42
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
43
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
Permalink
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
44
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
45
Computer Science Medium

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

  • ANetwork Layer
  • BData Link Layer
  • CTransport Layer
  • DSession Layer
Permalink
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
46
Computer Science Medium

What is the primary purpose of normalization in relational databases?

  • AIncrease redundancy
  • BReduce redundancy
  • CIncrease storage space
  • DImprove graphics rendering
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Correct Answer: Option B — Reduce redundancy
Explanation: Normalization organizes data into structured tables to minimize redundancy and dependency issues. It improves data integrity, reduces update anomalies, and makes databases easier to maintain and scale in real-world applications.
Submitted by: PaperMCQs
47
Computer Science Medium

Which data structure is most suitable for implementing recursion?

  • AQueue
  • BArray
  • CStack
  • DHeap
Permalink
Correct Answer: Option C — Stack
Explanation: Recursion relies on the call stack to store function calls, local variables, and return addresses. Every recursive call creates a new stack frame, which is removed when the function returns. This makes the stack the fundamental data structure behind recursion.
Submitted by: PaperMCQs
48
Computer Science Medium

What is the purpose of a firewall?

  • AIncrease processor speed
  • BProtect networks from unauthorized access
  • CStore files permanently
  • DCompress data
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Correct Answer: Option B — Protect networks from unauthorized access
Explanation: A firewall monitors and filters network traffic according to predefined security rules. It acts as a barrier between trusted and untrusted networks, helping prevent unauthorized access and cyberattacks.
Submitted by: PaperMCQs
49
Computer Science Medium

What is encapsulation in object-oriented programming?

  • ACombining data and methods into a single unit
  • BCreating multiple classes
  • CExecuting parallel processes
  • DAllocating memory dynamically
Permalink
Correct Answer: Option A — Combining data and methods into a single unit
Explanation: Encapsulation is the process of bundling data and methods within a class while restricting direct access to internal details. It improves modularity, maintainability, and security by controlling how data is accessed and modified.
Submitted by: PaperMCQs
50
Computer Science Medium

What is the time complexity of Binary Search in the worst case?

  • AO(n)
  • BO(log n)
  • CO(n²)
  • DO(1)
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Correct Answer: Option B — O(log n)
Explanation: Binary Search repeatedly divides a sorted dataset into halves until the target value is found or determined absent. Because the search space is halved each step, the worst-case time complexity is logarithmic, O(log n).
Submitted by: PaperMCQs
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