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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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Q131. Which loop is guaranteed to execute at least once?

  1. while
  2. for
  3. do-while
  4. foreach
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Correct answer: C. do-while

do-while checks the condition after the body.

Q132. How many bits are in an IPv6 address?

  1. 128
  2. 64
  3. 256
  4. 32
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Correct answer: A. 128

IPv6 addresses are 128 bits.

Q133. Which device is used to scan documents?

  1. Modem
  2. Scanner
  3. Printer
  4. Speaker
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Correct answer: B. Scanner

A scanner digitises documents.

Q134. What is the extension of a C++ source file?

  1. .cpp
  2. .c
  3. .cs
  4. .cc only
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Correct answer: A. .cpp

.cpp is the common C++ extension.

Q135. What is the index of the first element in most programming languages?

  1. 0
  2. 2
  3. -1
  4. 1
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Correct answer: A. 0

Arrays are zero-indexed in C, Java and Python.

Q136. What does .gov represent in a domain?

  1. Group
  2. Government
  3. General
  4. Gaming
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Correct answer: B. Government

.gov is for government sites.

Q137. What is a nibble?

  1. 16 bits
  2. 8 bits
  3. 4 bits
  4. 2 bits
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Correct answer: C. 4 bits

A nibble is half a byte.

Q138. Which device connects devices within a LAN using MAC addresses?

  1. Router
  2. Switch
  3. Repeater
  4. Modem
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Correct answer: B. Switch

A switch forwards frames by MAC address.

Q139. What is the process of restarting a computer called?

  1. Logoff
  2. Shutdown
  3. Sleep
  4. Reboot
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Correct answer: D. Reboot

A reboot restarts the system.

Q140. Which function prints output in Python?

  1. echo
  2. print()
  3. printf()
  4. cout
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Correct answer: B. print()

Python uses print().

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