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Computer Science MCQs

MCQs on Programming, Networking, Database and OS

601 Questions Subject Test
Subject Preparation Guide

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Strengthen your knowledge of computer fundamentals, hardware, software, programming, networks, databases and information technology.

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101
Medium nts Uploaded: 07 Aug 2026

What does the acronym 'RAM' NOT include?

  • A Volatility
  • B Permanent data storage
  • C Temporary data storage
  • D Fast access speed
102
Hard nts Uploaded: 23 Aug 2026

What is the purpose of encryption?

  • A To increase network speed
  • B To compress files
  • C To convert data into a secure, unreadable format
  • D To delete data
103
Easy ppsc nts Uploaded: 20 Jun 2026

What is the default file extension of a Microsoft Word document in modern versions?

  • A .doc
  • B .txt
  • C .docx
  • D .rtf
104
Easy nts Uploaded: 13 Aug 2026

What is the purpose of a JOIN in SQL?

  • A Delete records
  • B Backup data
  • C Create a database
  • D Combine rows from two or more tables
105
Easy fpsc Uploaded: 23 Aug 2026

What is the function of a computer's power supply unit (PSU)?

  • A To store data
  • B To connect to networks
  • C To convert AC power to DC power for internal components
  • D To display graphics
106
Medium nts Uploaded: 13 Aug 2026

Which programming paradigm treats computation as evaluation of functions?

  • A Object Oriented
  • B Functional Programming
  • C Procedural
  • D Logic Programming
107
Medium pms Uploaded: 07 Aug 2026

What does SQL stand for?

  • A Structured Question Language
  • B Simple Query Language
  • C Structured Query Language
  • D System Query Language
108
Medium fpsc Uploaded: 09 Aug 2026

What does 'CAD' stand for in computing?

  • A Computer-Aided Design
  • B Central Aided Design
  • C Computer Application Design
  • D Computer Automated Design
109
Easy ppsc Uploaded: 13 Aug 2026

What is debugging?

  • A Finding and fixing errors in code
  • B Designing a database
  • C Compiling a program
  • D Writing new code
110
Medium css pms fpsc ppsc nts Uploaded: 01 Jul 2026

Which search algorithm explores all nodes one level at a time before moving to the next level?

  • A A* Search
  • B Depth-First Search (DFS)
  • C Breadth-First Search (BFS)
  • D Greedy Search
111
Medium pms Uploaded: 23 Aug 2026

What is the function of the CPU's ALU?

  • A To manage memory addresses
  • B To connect peripherals
  • C To perform arithmetic and logical operations
  • D To store instructions
112
Easy fpsc nts Uploaded: 20 Jun 2026

What is phishing?

  • A Programming method
  • B Data backup
  • C Fraudulent attempt to steal information
  • D Network topology
113
Easy nts Uploaded: 09 Aug 2026

Which key is used to refresh a web page?

  • A F12
  • B F9
  • C F5
  • D F1
114
Easy pms Uploaded: 13 Aug 2026

Which device amplifies and regenerates signals over long distances?

  • A Switch
  • B Repeater
  • C Bridge
  • D Router
115
Medium fpsc Uploaded: 07 Aug 2026

What is the purpose of a foreign key in a relational database?

  • A Speed up query execution
  • B Store binary large objects
  • C Establish a link between two tables
  • D Encrypt sensitive data
116
Medium nts Uploaded: 23 Aug 2026

Who invented the World Wide Web?

  • A Mark Zuckerberg
  • B Steve Jobs
  • C Bill Gates
  • D Tim Berners-Lee
117
Medium fpsc nts Uploaded: 20 Jun 2026

Which sorting algorithm repeatedly selects the smallest element and places it in the correct position?

  • A Merge Sort
  • B Quick Sort
  • C Selection Sort
  • D Heap Sort
118
Easy css Uploaded: 13 Aug 2026

Which of the following is an example of a search engine?

  • A Google
  • B Photoshop
  • C Windows
  • D Excel
119
Hard fpsc Uploaded: 23 Aug 2026

Which of the following best describes an operating system's multitasking feature?

  • A Running multiple programs simultaneously
  • B Formatting the hard disk
  • C Running only one program at a time
  • D Deleting unused files
120
Hard ppsc Uploaded: 07 Aug 2026

Which of the following is an example of an operating system?

  • A Windows
  • B MS Word
  • C Excel
  • D Photoshop
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