Computer Hardware MCQs

Computer

Computer Hardware MCQs

Practice Computer Hardware MCQs with answers and detailed explanations covering input devices, output devices, scanners, printers, keyboards, monitors and computer hardware components frequently asked in competitive examinations.

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Total Questions

Practice Questions

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Question #1
Which of the following is an input device primarily used for entering text and commands into a computer?
A. Speaker
B. Printer
C. Monitor
D. Keyboard
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Correct Answer: Option D

Explanation:
Keyboard is a primary input device used for typing text and commands. Monitors and printers are output devices, while speakers output audio.
This question belongs to: Computer Computer Hardware
Question #2
What type of scanner is commonly used in offices for converting physical documents into digital images?
A. Handheld Scanner
B. Drum Scanner
C. Flatbed Scanner
D. Photo Scanner
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Correct Answer: Option C

Explanation:
Flatbed scanners are widely used in offices for document digitization due to their ease of use and quality.
This question belongs to: Computer Computer Hardware
Question #3
Which device converts digital signals from the computer into visual output on screen?
A. Keyboard
B. Mouse
C. Scanner
D. Monitor
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Correct Answer: Option D

Explanation:
Monitor is an output device that displays visual information from the computer.
This question belongs to: Computer Computer Hardware
Question #4
What is the full form of CPU in computer hardware?
A. Central Processing Unit
B. Computer Personal Unit
C. Central Power Unit
D. Control Processing Unit
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Correct Answer: Option A

Explanation:
CPU stands for Central Processing Unit, which is the brain of the computer responsible for processing instructions.
This question belongs to: Computer Computer Hardware
Question #5
Which of the following is NOT an input device?
A. Plotter
B. Trackball
C. Microphone
D. Joystick
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Correct Answer: Option A

Explanation:
Plotter is an output device used for printing large graphics, while the others are input devices.
This question belongs to: Computer Computer Hardware
Question #6
What technology is used in most modern keyboards to detect key presses?
A. Mechanical switches
B. Capacitive sensing
C. Membrane technology
D. Optical sensors
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Correct Answer: Option C

Explanation:
Membrane keyboards are common in standard office setups due to affordability, though mechanical are also popular.
This question belongs to: Computer Computer Hardware
Question #7
Which output device is used to produce hard copies of documents on paper?
A. Printer
B. Monitor
C. Speaker
D. Projector
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Correct Answer: Option A

Explanation:
Printer produces physical copies (hard copies) of digital documents.
This question belongs to: Computer Computer Hardware
Question #8
RAM is an example of which type of memory?
A. Secondary memory
B. Non-volatile memory
C. Volatile memory
D. Read-only memory
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Correct Answer: Option C

Explanation:
RAM is volatile memory that loses data when power is turned off.
This question belongs to: Computer Computer Hardware
Question #9
What does the term DPI refer to in the context of printers and scanners?
A. Dots Per Inch
B. Display Pixel Index
C. Digital Print Intensity
D. Data Processing Index
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Correct Answer: Option A

Explanation:
DPI stands for Dots Per Inch, measuring the resolution of printers and scanners.
This question belongs to: Computer Computer Hardware
Question #10
Which component stores data permanently even when the computer is powered off?
A. Cache Memory
B. RAM
C. Hard Disk Drive
D. ROM
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Correct Answer: Option C

Explanation:
HDD is a non-volatile secondary storage device.
This question belongs to: Computer Computer Hardware
Question #11
What is the primary function of a computer mouse?
A. To scan barcodes
B. To print documents
C. To display images
D. To point and select objects on screen
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Correct Answer: Option D

Explanation:
Mouse is a pointing input device used for navigation and selection.
This question belongs to: Computer Computer Hardware
Question #12
Which type of monitor uses liquid crystals for display?
A. Plasma Monitor
B. LCD Monitor
C. CRT Monitor
D. LED Monitor
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Correct Answer: Option B

Explanation:
LCD (Liquid Crystal Display) monitors use liquid crystals.
This question belongs to: Computer Computer Hardware
Question #13
What is the role of the motherboard in a computer system?
A. To process instructions
B. To store data long-term
C. To connect and communicate between various hardware components
D. To provide power supply
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Correct Answer: Option C

Explanation:
Motherboard acts as the main circuit board connecting all components.
This question belongs to: Computer Computer Hardware
Question #14
Which input device is used for capturing images and converting them to digital form?
A. Plotter
B. Printer
C. Speaker
D. Scanner
Discuss
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Correct Answer: Option D

Explanation:
Scanner digitizes physical images and documents.
This question belongs to: Computer Computer Hardware
Question #15
SSD stands for:
A. System Storage Disk
B. Secondary Storage Drive
C. Secure Storage Device
D. Solid State Drive
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Correct Answer: Option D

Explanation:
SSD is a faster, non-mechanical storage device using flash memory.
This question belongs to: Computer Computer Hardware
Question #16
In competitive exams, which device is often asked as an example of both input and output?
A. RAM
B. Touchscreen
C. Hard Disk
D. Keyboard
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Correct Answer: Option B

Explanation:
Touchscreen can function as both input (touch) and output (display) device.
This question belongs to: Computer Computer Hardware
Question #17
What is the full form of USB?
A. Universal Storage Bus
B. User Serial Board
C. Universal Serial Bus
D. United System Bus
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Correct Answer: Option C

Explanation:
USB is a standard for connecting peripherals to computers.
This question belongs to: Computer Computer Hardware
Question #18
Which printer technology uses electrostatic charges to print?
A. Dot Matrix Printer
B. Laser Printer
C. Inkjet Printer
D. Thermal Printer
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Correct Answer: Option B

Explanation:
Laser printers use laser and electrostatic principles.
This question belongs to: Computer Computer Hardware
Question #19
Cache memory is used to:
A. Provide backup power
B. Store permanent data
C. Display graphics
D. Speed up access to frequently used data
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Correct Answer: Option D

Explanation:
Cache memory improves performance by storing frequently accessed data.
This question belongs to: Computer Computer Hardware
Question #20
Which of the following is an optical input device?
A. Barcode Reader
B. Joystick
C. Keyboard
D. Mouse
Discuss
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Correct Answer: Option A

Explanation:
Barcode reader uses optical technology to scan barcodes.
This question belongs to: Computer Computer Hardware

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