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Computer Science MCQs with Answers

Computer knowledge is tested in jobs ranging from clerical posts to IT positions. Practice MCQs on computer fundamentals, hardware, software, MS Office, networking, internet, databases and programming concepts, and see your score as soon as you finish.

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Q21. What is ransomware?

  1. A web server
  2. A backup tool
  3. Malware that locks files for payment
  4. A free antivirus
Show answer and explanation

Correct answer: C. Malware that locks files for payment

Ransomware encrypts data and demands payment.

Q22. Which device converts digital signals to analog and vice versa?

  1. Modem
  2. Router
  3. Switch
  4. Hub
Show answer and explanation

Correct answer: A. Modem

A modem modulates and demodulates.

Q23. What is a spreadsheet application?

  1. Software for working with tables of numbers
  2. An antivirus
  3. A word processor
  4. A browser
Show answer and explanation

Correct answer: A. Software for working with tables of numbers

Excel is a spreadsheet application.

Q24. In Excel, how many rows are in a worksheet (modern versions)?

  1. 65,536
  2. 1,048,576
  3. 1,000,000
  4. 100,000
Show answer and explanation

Correct answer: B. 1,048,576

Excel has 1,048,576 rows.

Q25. In an email, what does BCC stand for?

  1. Binary Carbon Copy
  2. Blind Computer Copy
  3. Blind Carbon Copy
  4. Basic Carbon Copy
Show answer and explanation

Correct answer: C. Blind Carbon Copy

BCC hides recipients from each other.

Q26. Which Windows tool shows running programs and resource use?

  1. Control Panel
  2. File Explorer
  3. Task Manager
  4. Device Manager
Show answer and explanation

Correct answer: C. Task Manager

Task Manager monitors processes.

Q27. Which function key is used to check spelling in Word?

  1. F7
  2. F5
  3. F1
  4. F12
Show answer and explanation

Correct answer: A. F7

F7 starts spell check.

Q28. Which shortcut key saves a document?

  1. Ctrl + N
  2. Ctrl + S
  3. Ctrl + O
  4. Ctrl + P
Show answer and explanation

Correct answer: B. Ctrl + S

Ctrl+S saves.

Q29. In MS Word, what is the standard font size default in recent versions?

  1. 12 pt
  2. 10 pt
  3. 11 pt
  4. 14 pt
Show answer and explanation

Correct answer: C. 11 pt

Recent Word versions default to 11 pt Calibri/Aptos.

Q30. Who developed Python?

  1. Larry Wall
  2. James Gosling
  3. Dennis Ritchie
  4. Guido van Rossum
Show answer and explanation

Correct answer: D. Guido van Rossum

Van Rossum created Python.

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