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

Page 5 of 22
Question #81
Which device is used in ATMs for card reading?
A. Joystick
B. Flatbed scanner
C. Magnetic stripe reader
D. OCR
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Correct Answer: Option C

Explanation:
Magnetic stripe readers read card data.
This question belongs to: Computer Computer Hardware
Question #82
L1, L2, L3 refer to levels of:
A. RAM modules
B. Cache memory
C. Hard disk partitions
D. Monitor sizes
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Correct Answer: Option B

Explanation:
Multi-level cache in modern CPUs.
This question belongs to: Computer Computer Hardware
Question #83
What is the main use of a document feeder in scanners?
A. To feed multiple sheets automatically
B. To increase resolution
C. To print scanned documents
D. To change colors
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Correct Answer: Option A

Explanation:
Automatic Document Feeder (ADF) speeds up batch scanning.
This question belongs to: Computer Computer Hardware
Question #84
Which hardware is essential for booting the computer?
A. Speaker
B. External monitor
C. Wireless mouse
D. BIOS chip on motherboard
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Correct Answer: Option D

Explanation:
BIOS initializes hardware during boot.
This question belongs to: Computer Computer Hardware
Question #85
4K resolution is approximately:
A. 2560x1440
B. 1280x720
C. 3840x2160
D. 1920x1080
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Correct Answer: Option C

Explanation:
4K UHD is 3840 × 2160 pixels.
This question belongs to: Computer Computer Hardware
Question #86
Which is an example of secondary storage?
A. RAM
B. Registers
C. Cache
D. Pen drive
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Correct Answer: Option D

Explanation:
Pen drives are external secondary storage.
This question belongs to: Computer Computer Hardware
Question #87
The technology behind modern touchscreens is primarily:
A. Infrared
B. Resistive
C. Capacitive
D. Surface acoustic wave
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Correct Answer: Option C

Explanation:
Capacitive touchscreens are common in smartphones and tablets.
This question belongs to: Computer Computer Hardware
Question #88
What does the 'dpi' setting affect in a mouse?
A. Sensitivity and cursor speed
B. Wireless range
C. Color of LED
D. Battery life
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Correct Answer: Option A

Explanation:
Higher DPI means more sensitive mouse movement.
This question belongs to: Computer Computer Hardware
Question #89
Which component is responsible for fan control in a PC?
A. Hard disk controller
B. RAM
C. CPU only
D. BIOS/UEFI
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Correct Answer: Option D

Explanation:
BIOS manages hardware including cooling.
This question belongs to: Computer Computer Hardware
Question #90
Line printers are used for:
A. Photo printing
B. Color graphics
C. High-speed bulk printing
D. Home use
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Correct Answer: Option C

Explanation:
They are high-volume impact printers.
This question belongs to: Computer Computer Hardware
Question #91
What is the role of Northbridge chipset?
A. Connects CPU to RAM and graphics
B. Audio processing
C. Manages power supply
D. Handles slow peripherals
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Correct Answer: Option A

Explanation:
Northbridge handles high-speed components.
This question belongs to: Computer Computer Hardware
Question #92
A common wireless input device is:
A. VGA monitor
B. USB scanner
C. Bluetooth mouse
D. Wired keyboard
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Correct Answer: Option C

Explanation:
Bluetooth enables wireless connectivity.
This question belongs to: Computer Computer Hardware
Question #93
Flash memory is a type of:
A. Magnetic storage
B. Volatile RAM
C. Non-volatile EEPROM variant
D. Optical storage
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Correct Answer: Option C

Explanation:
Used in USB drives and SSDs.
This question belongs to: Computer Computer Hardware
Question #94
What is ghosting in monitors?
A. Permanent burn-in
B. High brightness
C. Color inaccuracy
D. Blurry moving images due to slow response
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Correct Answer: Option D

Explanation:
Response time affects ghosting in displays.
This question belongs to: Computer Computer Hardware
Question #95
Which port is used for high-speed data transfer in modern systems?
A. PS/2 port
B. USB 3.0 or Thunderbolt
C. Parallel port
D. Serial port
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Correct Answer: Option B

Explanation:
USB 3.x and Thunderbolt offer high speeds.
This question belongs to: Computer Computer Hardware
Question #96
The process of converting analog to digital in scanners is done by:
A. ALU
B. ADC
C. CU
D. DAC
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Correct Answer: Option B

Explanation:
Analog to Digital Converter digitizes scanned data.
This question belongs to: Computer Computer Hardware
Question #97
Which hardware failure often causes 'blue screen' errors?
A. Printer jam
B. Faulty RAM
C. Monitor cable
D. Damaged keyboard
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Correct Answer: Option B

Explanation:
Bad RAM is a common cause of system crashes.
This question belongs to: Computer Computer Hardware
Question #98
What is aspect ratio in monitors?
A. Ratio of width to height of display
B. Pixel density
C. Refresh rate
D. Number of colors
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Correct Answer: Option A

Explanation:
Common ratios are 16:9 and 16:10.
This question belongs to: Computer Computer Hardware
Question #99
Which device uses a ribbon for printing?
A. Inkjet printer
B. Dot matrix printer
C. Thermal printer
D. Laser printer
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Correct Answer: Option B

Explanation:
Dot matrix uses inked ribbon.
This question belongs to: Computer Computer Hardware
Question #100
The number of bits processed by CPU at a time is called:
A. Byte size
B. Clock cycle
C. Bus width
D. Word size
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Correct Answer: Option D

Explanation:
Word length or bus width, e.g., 64-bit processor.
This question belongs to: Computer Computer Hardware

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