1. Which protocol is used to translate domain names to IP addresses?
A) DHCP
B) ARP
C) DNS
D) NAT
✅ Answer: C) DNS
💡 Explanation: DNS (Domain Name System) resolves human-readable domain names (like google.com) into their IP addresses.
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2. The ‘blue screen of death’ (BSOD) in Windows indicates:
A) A software update
B) A critical system error causing Windows to halt
C) A hardware upgrade requirement
D) A virus attack
✅ Answer: B) A critical system error causing Windows to halt
💡 Explanation: BSOD appears when Windows encounters a critical error from which it cannot recover, halting the system.
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3. Which type of storage is the fastest among the following?
A) HDD
B) SSD
C) Optical Drive
D) USB Flash Drive
✅ Answer: B) SSD
💡 Explanation: SSDs (Solid State Drives) use NAND flash memory with no moving parts, making them significantly faster than HDDs.
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4. In Excel, which function returns the highest value in a range?
A) HIGH()
B) TOP()
C) MAX()
D) PEAK()
✅ Answer: C) MAX()
💡 Explanation: Excel’s MAX() function returns the maximum (highest) value from a range of cells.
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5. BIOS stands for:
A) Basic Input Output System
B) Binary Input Output Software
C) Basic Internal Operating System
D) Built-in Input Output Standard
✅ Answer: A) Basic Input Output System
💡 Explanation: BIOS (Basic Input/Output System) is firmware that initializes hardware during booting and provides runtime services to the OS.
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6. Which port number is used by HTTP?
A) 21
B) 25
C) 80
D) 110
✅ Answer: C) 80
💡 Explanation: HTTP (Hypertext Transfer Protocol) uses port 80 for unencrypted web communication.
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7. Phishing attacks are typically carried out through:
A) Direct hardware attacks
B) Fraudulent emails or websites that trick users into revealing credentials
C) Network scanning
D) Physical theft
✅ Answer: B) Fraudulent emails or websites that trick users into revealing credentials
💡 Explanation: Phishing uses deceptive emails or fake websites mimicking trusted entities to steal login credentials or sensitive data.
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8. Which shortcut key is used to permanently delete a file in Windows (without Recycle Bin)?
A) Delete
B) Ctrl+D
C) Shift+Delete
D) Alt+Delete
✅ Answer: C) Shift+Delete
💡 Explanation: Shift+Delete permanently deletes files in Windows, bypassing the Recycle Bin.
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9. WWW was invented by:
A) Bill Gates
B) Tim Berners-Lee
C) Vint Cerf
D) Steve Jobs
✅ Answer: B) Tim Berners-Lee
💡 Explanation: Tim Berners-Lee invented the World Wide Web (WWW) in 1989 while working at CERN.
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10. The full form of PDF is:
A) Portable Document Format
B) Printed Document File
C) Personal Document Format
D) Protected Data Format
✅ Answer: A) Portable Document Format
💡 Explanation: PDF (Portable Document Format) was created by Adobe and presents documents independent of hardware, OS, or software.
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11. Which key combination is used to take a screenshot on Windows 10/11?
A) Ctrl+S
B) Alt+PrtSc
C) Windows+Shift+S
D) Ctrl+Alt+S
✅ Answer: C) Windows+Shift+S
💡 Explanation: Windows+Shift+S opens the Snip & Sketch tool for selective screenshots in Windows 10/11.
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12. A pixel in a digital image represents:
A) A line of data
B) The smallest unit of a digital image
C) The resolution of the screen
D) A compressed data block
✅ Answer: B) The smallest unit of a digital image
💡 Explanation: A pixel (picture element) is the smallest discrete unit of a digital image, containing color and brightness information.
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13. Which keyboard shortcut is used to close a running application in Windows?
A) Ctrl+W
B) Alt+F4
C) Ctrl+Q
D) Windows+D
✅ Answer: B) Alt+F4
💡 Explanation: Alt+F4 closes the currently active application window in Windows operating system.
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14. Which of the following is NOT an input device?
A) Scanner
B) Keyboard
C) Monitor
D) Microphone
✅ Answer: C) Monitor
💡 Explanation: A monitor is an output device that displays information. Keyboard, scanner, and microphone are input devices.
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15. What is the full form of USB?
A) Universal System Bus
B) Universal Serial Bus
C) Unified Serial Bridge
D) Universal Software Bus
✅ Answer: B) Universal Serial Bus
💡 Explanation: USB (Universal Serial Bus) is an industry standard for cables and connectors for communication and power supply.
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16. The first computer virus was called:
A) ILOVEYOU
B) Brain
C) Creeper
D) Melissa
✅ Answer: C) Creeper
💡 Explanation: Creeper (1971) is considered the first computer virus/worm, which spread through ARPANET displaying ‘I’m the creeper, catch me if you can!’
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17. Which language is called the ‘mother of all programming languages’?
A) FORTRAN
B) COBOL
C) BCPL
D) Assembly Language
✅ Answer: D) Assembly Language
💡 Explanation: Assembly Language is often called the mother of all programming languages as it directly corresponds to machine code instructions.
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18. In MS Word, ‘Mail Merge’ is used for:
A) Merging two Word documents
B) Sending the same document to multiple recipients with personalized details
C) Creating email signatures
D) Merging tables in a document
✅ Answer: B) Sending the same document to multiple recipients with personalized details
💡 Explanation: Mail Merge automates sending personalized letters/emails by merging a template with a data source containing recipient details.
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19. Which of the following is an example of non-volatile memory?
A) RAM
B) Cache
C) CPU Registers
D) ROM
✅ Answer: D) ROM
💡 Explanation: ROM (Read-Only Memory) is non-volatile — it retains data even when power is off, unlike RAM which is volatile.
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20. The Internet was originally developed by:
A) Microsoft
B) Google
C) ARPANET (US Department of Defense)
D) IBM
✅ Answer: C) ARPANET (US Department of Defense)
💡 Explanation: The internet evolved from ARPANET, a US Department of Defense project started in 1969 for resilient communication.
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