Computer Hardware MCQs

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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. Keyboard
B. Printer
C. Monitor
D. Speaker
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Correct Answer: Option A

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. Flatbed Scanner
B. Handheld Scanner
C. Drum Scanner
D. Photo Scanner
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Correct Answer: Option A

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. Monitor
C. Mouse
D. Scanner
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Correct Answer: Option B

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. Control Processing Unit
C. Central Power Unit
D. Computer Personal 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. Membrane technology
B. Mechanical switches
C. Capacitive sensing
D. Optical sensors
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Correct Answer: Option A

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. Monitor
B. Speaker
C. Printer
D. Projector
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Correct Answer: Option C

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. Read-only memory
B. Volatile memory
C. Secondary memory
D. Non-volatile memory
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Correct Answer: Option B

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. Data Processing Index
B. Display Pixel Index
C. Dots Per Inch
D. Digital Print Intensity
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Correct Answer: Option C

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. ROM
B. Hard Disk Drive
C. RAM
D. Cache Memory
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Correct Answer: Option B

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 point and select objects on screen
B. To display images
C. To scan barcodes
D. To print documents
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Correct Answer: Option A

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. LED Monitor
B. LCD Monitor
C. Plasma Monitor
D. CRT 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 connect and communicate between various hardware components
B. To process instructions
C. To store data long-term
D. To provide power supply
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Correct Answer: Option A

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. Speaker
B. Printer
C. Plotter
D. Scanner
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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. Solid State Drive
C. Secure Storage Device
D. Secondary Storage Drive
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Correct Answer: Option B

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. Touchscreen
B. Keyboard
C. RAM
D. Hard Disk
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Correct Answer: Option A

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. User Serial Board
B. Universal Serial Bus
C. Universal Storage Bus
D. United System Bus
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Correct Answer: Option B

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. Laser Printer
B. Inkjet Printer
C. Dot Matrix Printer
D. Thermal Printer
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Correct Answer: Option A

Explanation:
Laser printers use laser and electrostatic principles.
This question belongs to: Computer Computer Hardware
Question #19
Cache memory is used to:
A. Store permanent data
B. Provide backup power
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. Mouse
D. Keyboard
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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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