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IT Jobs Computer Science MCQs with Answers

179 practice MCQs on Computer Science for IT Jobs tests. Think of your answer first, then open "Show answer and explanation". These are practice questions, not official examination papers.

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Q61. Which SQL clause groups rows with the same values?

  1. JOIN
  2. GROUP BY
  3. WHERE
  4. ORDER BY
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Correct answer: B. GROUP BY

GROUP BY groups rows for aggregate functions.

Q62. What does WAN stand for?

  1. Web Area Network
  2. Wide Area Network
  3. Wireless Area Network
  4. World Area Network
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Correct answer: B. Wide Area Network

A WAN covers a large area.

Q63. Which is the smallest type of computer?

  1. Microcomputer / embedded device
  2. Supercomputer
  3. Minicomputer
  4. Mainframe
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Correct answer: A. Microcomputer / embedded device

Microcomputers are the smallest class.

Q64. What is a strong password?

  1. A mix of letters, numbers and symbols
  2. Your birthday
  3. 123456
  4. Your name
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Correct answer: A. A mix of letters, numbers and symbols

Strong passwords are long and complex.

Q65. What does HTTP stand for?

  1. HyperText Transport Process
  2. HyperText Transmission Protocol
  3. HyperText Transfer Protocol
  4. High Transfer Text Protocol
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Correct answer: C. HyperText Transfer Protocol

HTTP is the web protocol.

Q66. Which symbol is used for single-line comments in Python?

  1. //
  2. --
  3. /*
  4. #
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Correct answer: D. #

Python uses # for comments.

Q67. What is the unit of resolution of a screen?

  1. Pixel
  2. Hertz
  3. Byte
  4. Watt
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Correct answer: A. Pixel

Screen resolution is measured in pixels.

Q68. What does PDF stand for?

  1. Personal Document Format
  2. Portable Data File
  3. Portable Document Format
  4. Printable Document File
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Correct answer: C. Portable Document Format

PDF was created by Adobe.

Q69. What is the function of the Recycle Bin?

  1. Compresses files
  2. Temporarily stores deleted files
  3. Permanently deletes files
  4. Stores backups
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Correct answer: B. Temporarily stores deleted files

Deleted files can be restored from it.

Q70. What is e-commerce?

  1. Sending email
  2. Buying and selling goods online
  3. Repairing computers
  4. Browsing the Internet
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Correct answer: B. Buying and selling goods online

E-commerce is online trade.

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