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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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Q1. Which of these is a relational database management system?

  1. MySQL
  2. Linux
  3. HTML
  4. Photoshop
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Correct answer: A. MySQL

MySQL stores data in related tables; the others are not database systems.

Q2. What does ISP stand for?

  1. Internal Service Provider
  2. Information Service Provider
  3. Internet Service Provider
  4. Internet System Protocol
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Correct answer: C. Internet Service Provider

An ISP provides Internet access.

Q3. Which SQL statement is used to create a table?

  1. NEW TABLE
  2. ADD TABLE
  3. MAKE TABLE
  4. CREATE TABLE
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Correct answer: D. CREATE TABLE

CREATE TABLE defines a table.

Q4. Which symbol is used for single-line comments in C/C++/Java?

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

// begins a line comment.

Q5. What is the binary of decimal 5?

  1. 100
  2. 110
  3. 101
  4. 111
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Correct answer: C. 101

5 = 4 + 1 = 101.

Q6. How many bits are in an IPv4 address?

  1. 64
  2. 32
  3. 128
  4. 16
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Correct answer: B. 32

IPv4 addresses are 32 bits.

Q7. Which protocol is used to receive email from a server (download)?

  1. FTP
  2. POP3
  3. SMTP
  4. HTTP
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Correct answer: B. POP3

POP3 retrieves email.

Q8. Which is not an operating system?

  1. Linux
  2. Oracle
  3. macOS
  4. Windows
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Correct answer: B. Oracle

Oracle is a database product.

Q9. Which memory is volatile?

  1. ROM
  2. Hard disk
  3. Flash drive
  4. RAM
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Correct answer: D. RAM

RAM loses its data when power is off.

Q10. What is the kernel?

  1. A text editor
  2. A web browser
  3. Core of the operating system
  4. A game
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Correct answer: C. Core of the operating system

The kernel manages hardware and processes.

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