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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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Q41. What does SSL/TLS provide?

  1. Encrypted communication
  2. Free storage
  3. Spam filtering
  4. Faster Internet
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Correct answer: A. Encrypted communication

It encrypts data in transit.

Q42. What is a deadlock?

  1. Processes waiting for each other indefinitely
  2. A fast process
  3. A completed process
  4. A memory leak
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Correct answer: A. Processes waiting for each other indefinitely

Deadlock occurs when no process can proceed.

Q43. What does SMTP stand for?

  1. Standard Mail Transfer Program
  2. Simple Mail Transfer Protocol
  3. Secure Mail Transfer Protocol
  4. Simple Message Transfer Protocol
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Correct answer: B. Simple Mail Transfer Protocol

SMTP sends email.

Q44. What does SQL stand for?

  1. Sequential Query Language
  2. Structured Query Language
  3. Simple Query Language
  4. Standard Query Logic
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Correct answer: B. Structured Query Language

SQL is used for relational databases.

Q45. Which data structure is used for DFS (depth-first search)?

  1. Queue
  2. Heap
  3. Hash table
  4. Stack
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Correct answer: D. Stack

DFS uses a stack (or recursion).

Q46. Which is a free and open-source operating system?

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

Linux is open-source.

Q47. What is recursion?

  1. A variable
  2. A function calling itself
  3. A loop
  4. A data type
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Correct answer: B. A function calling itself

Recursion solves problems by self-reference.

Q48. What is normalization?

  1. Organising data to reduce redundancy
  2. Increasing redundancy
  3. Encrypting data
  4. Deleting data
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Correct answer: A. Organising data to reduce redundancy

Normalization reduces duplication.

Q49. What does .edu represent in a domain?

  1. Electronics
  2. Economy
  3. Engineering
  4. Educational institutions
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Correct answer: D. Educational institutions

.edu is for education.

Q50. What is the extension of a C source file?

  1. .cs
  2. .c
  3. .h only
  4. .cpp
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Correct answer: B. .c

.c is the C extension.

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