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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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Q161. What does DBMS stand for?

  1. Data Backup Management System
  2. Database Memory System
  3. Digital Base Management System
  4. Database Management System
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Correct answer: D. Database Management System

A DBMS manages databases.

Q162. Which header file is needed for printf in C?

  1. stdio.h
  2. conio.h
  3. math.h
  4. string.h
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Correct answer: A. stdio.h

printf is declared in stdio.h.

Q163. What is encapsulation?

  1. Importing libraries
  2. Creating arrays
  3. Wrapping data and methods into a single unit
  4. Looping
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Correct answer: C. Wrapping data and methods into a single unit

Encapsulation bundles data with methods.

Q164. What is the extension of a Java source file?

  1. .py
  2. .cpp
  3. .js
  4. .java
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Correct answer: D. .java

Java source files end with .java.

Q165. In a flowchart, which shape represents a decision?

  1. Rectangle
  2. Oval
  3. Diamond
  4. Parallelogram
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Correct answer: C. Diamond

A diamond is used for decisions.

Q166. What does .pk represent as a domain?

  1. Pakistan
  2. Packet
  3. Peking
  4. Public
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Correct answer: A. Pakistan

.pk is the country-code domain for Pakistan.

Q167. What does a Trojan horse do?

  1. Repairs files
  2. Speeds up the computer
  3. Disguises itself as legitimate software
  4. Backs up data
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Correct answer: C. Disguises itself as legitimate software

A Trojan hides malicious code inside a useful-looking program.

Q168. What does .com stand for in a domain?

  1. Computer
  2. Commercial
  3. Community
  4. Company
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Correct answer: B. Commercial

.com originally meant commercial.

Q169. What is a variable?

  1. A function
  2. An error
  3. A type of loop
  4. A named storage location
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Correct answer: D. A named storage location

A variable stores a value.

Q170. What does HTTPS stand for?

  1. HyperText Transmission Protocol Secure
  2. HyperText Transport Process Secure
  3. High Transfer Protocol Secure
  4. HyperText Transfer Protocol Secure
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Correct answer: D. HyperText Transfer Protocol Secure

HTTPS uses TLS encryption.

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