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Computer Science MCQs

MCQs on Programming, Networking, Database and OS

47 Questions
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21
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What is artificial intelligence?

  • A Computer hardware
  • B Simulation of human intelligence by machines
  • C Network design
  • D Database storage
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Correct Answer: Option B — Simulation of human intelligence by machines
Explanation: Artificial Intelligence enables machines to perform tasks requiring human-like reasoning and learning.
Submitted by: PaperMCQs
22
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Which database operation removes a table completely?

  • A DELETE
  • B REMOVE
  • C DROP
  • D CLEAR
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Correct Answer: Option C — DROP
Explanation: DROP permanently removes an entire database object including structure and data.
Submitted by: PaperMCQs
23
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Which cyberattack encrypts files and demands payment?

  • A Spyware
  • B Ransomware
  • C Adware
  • D Trojan
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Correct Answer: Option B — Ransomware
Explanation: Ransomware locks or encrypts data and demands a ransom for restoration.
Submitted by: PaperMCQs
24
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What is multitasking in an operating system?

  • A Using multiple monitors
  • B Running multiple processes concurrently
  • C Installing multiple OS
  • D Using many files
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Correct Answer: Option B — Running multiple processes concurrently
Explanation: Multitasking enables an operating system to execute multiple programs seemingly at the same time.
Submitted by: PaperMCQs
25
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What is a database schema?

  • A Backup file
  • B Structure of a database
  • C Network device
  • D Programming language
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Correct Answer: Option B — Structure of a database
Explanation: A database schema defines tables, fields, relationships, and constraints.
Submitted by: PaperMCQs
26
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Which layer of OSI handles physical transmission of bits?

  • A Network
  • B Transport
  • C Physical
  • D Session
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Correct Answer: Option C — Physical
Explanation: The Physical Layer is responsible for transmitting raw bits over communication channels.
Submitted by: PaperMCQs
27
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Which programming language is primarily used for Android development?

  • A Swift
  • B Kotlin
  • C Ruby
  • D PHP
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Correct Answer: Option B — Kotlin
Explanation: Kotlin is Google's preferred language for Android app development because of its modern syntax and safety features.
Submitted by: PaperMCQs
28
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Which protocol is used to securely transfer files over SSH?

  • A FTP
  • B TFTP
  • C SFTP
  • D SMTP
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Correct Answer: Option C — SFTP
Explanation: SFTP operates over SSH and provides encrypted file transfer capabilities, making it more secure than traditional FTP for transmitting sensitive data.
Submitted by: PaperMCQs
29
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Which Excel chart is best for showing trends over time?

  • A Pie Chart
  • B Line Chart
  • C Scatter Plot
  • D Radar Chart
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Correct Answer: Option B — Line Chart
Explanation: Line charts effectively display trends and changes across time periods, making them useful for analysis.
Submitted by: PaperMCQs
30
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What is a macro in MS Office?

  • A Database
  • B Automated task sequence
  • C Chart type
  • D Network protocol
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Correct Answer: Option B — Automated task sequence
Explanation: A macro automates repetitive tasks by storing commands and actions that can be replayed later.
Submitted by: PaperMCQs
31
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Which Excel reference remains fixed when copied?

  • A Relative Reference
  • B Mixed Reference
  • C Absolute Reference
  • D Dynamic Reference
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Correct Answer: Option C — Absolute Reference
Explanation: Absolute references use dollar signs and do not change when formulas are copied to other cells.
Submitted by: PaperMCQs
32
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What does VLOOKUP do in Excel?

  • A Creates charts
  • B Searches values vertically
  • C Deletes rows
  • D Sorts data
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Correct Answer: Option B — Searches values vertically
Explanation: VLOOKUP searches for a value in the first column of a table and returns related information from another column.
Submitted by: PaperMCQs
33
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Which software development model follows a sequential approach?

  • A Agile
  • B Scrum
  • C Waterfall
  • D DevOps
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Correct Answer: Option C — Waterfall
Explanation: The Waterfall model progresses through defined phases in sequence and is suitable for stable requirements.
Submitted by: PaperMCQs
34
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What is the purpose of a foreign key?

  • A Store passwords
  • B Identify duplicate records
  • C Create relationships between tables
  • D Encrypt database contents
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Correct Answer: Option C — Create relationships between tables
Explanation: Foreign keys enforce relationships between tables and maintain referential integrity.
Submitted by: PaperMCQs
35
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Which of the following is a NoSQL database?

  • A Oracle
  • B MySQL
  • C MongoDB
  • D PostgreSQL
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Correct Answer: Option C — MongoDB
Explanation: MongoDB is a document-oriented NoSQL database designed for flexible and scalable data storage.
Submitted by: PaperMCQs
36
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What is the purpose of an index in a database?

  • A Reduce security
  • B Improve query performance
  • C Store backups
  • D Encrypt records
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Correct Answer: Option B — Improve query performance
Explanation: Indexes improve retrieval speed by allowing databases to locate records efficiently.
Submitted by: PaperMCQs
37
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Which memory is fastest among the following?

  • A Hard Disk
  • B RAM
  • C Cache Memory
  • D ROM
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Correct Answer: Option C — Cache Memory
Explanation: Cache memory stores frequently used data close to the CPU and is significantly faster than RAM.
Submitted by: PaperMCQs
38
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What is polymorphism in object-oriented programming?

  • A Data hiding
  • B Ability of an object to take multiple forms
  • C Memory allocation
  • D Database indexing
Permalink
Correct Answer: Option B — Ability of an object to take multiple forms
Explanation: Polymorphism allows objects to be treated through a common interface while exhibiting different behaviors depending on their actual type.
Submitted by: PaperMCQs
39
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Which OSI layer is responsible for end-to-end communication?

  • A Network Layer
  • B Data Link Layer
  • C Transport Layer
  • D Session Layer
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Correct Answer: Option C — Transport Layer
Explanation: The Transport Layer provides end-to-end communication, reliability, flow control, and error handling using protocols such as TCP and UDP.
Submitted by: PaperMCQs
40
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What is the primary purpose of normalization in relational databases?

  • A Increase redundancy
  • B Reduce redundancy
  • C Increase storage space
  • D Improve graphics rendering
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Correct Answer: Option B — Reduce redundancy
Explanation: Normalization organizes data into structured tables to minimize redundancy and dependency issues. It improves data integrity, reduces update anomalies, and makes databases easier to maintain and scale in real-world applications.
Submitted by: PaperMCQs
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