Computer Hardware MCQs with Answers and Explanations

Question #81

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Which device is used in ATMs for card reading?

A. Flatbed scanner

B. Joystick

C. OCR

D. Magnetic stripe reader

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Correct Answer: Option D

Explanation:
Magnetic stripe readers read card data.

This question belongs to: Computer Computer Hardware

Question #82

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L1, L2, L3 refer to levels of:

A. Monitor sizes

B. Cache memory

C. RAM modules

D. Hard disk partitions

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Correct Answer: Option B

Explanation:
Multi-level cache in modern CPUs.

This question belongs to: Computer Computer Hardware

Question #83

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What is the main use of a document feeder in scanners?

A. To print scanned documents

B. To change colors

C. To increase resolution

D. To feed multiple sheets automatically

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Correct Answer: Option D

Explanation:
Automatic Document Feeder (ADF) speeds up batch scanning.

This question belongs to: Computer Computer Hardware

Question #84

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Which hardware is essential for booting the computer?

A. Speaker

B. BIOS chip on motherboard

C. External monitor

D. Wireless mouse

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Correct Answer: Option B

Explanation:
BIOS initializes hardware during boot.

This question belongs to: Computer Computer Hardware

Question #85

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4K resolution is approximately:

A. 1920x1080

B. 3840x2160

C. 2560x1440

D. 1280x720

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Correct Answer: Option B

Explanation:
4K UHD is 3840 × 2160 pixels.

This question belongs to: Computer Computer Hardware

Question #86

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Which is an example of secondary storage?

A. RAM

B. Pen drive

C. Cache

D. Registers

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Correct Answer: Option B

Explanation:
Pen drives are external secondary storage.

This question belongs to: Computer Computer Hardware

Question #87

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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

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What does the 'dpi' setting affect in a mouse?

A. Wireless range

B. Sensitivity and cursor speed

C. Color of LED

D. Battery life

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Correct Answer: Option B

Explanation:
Higher DPI means more sensitive mouse movement.

This question belongs to: Computer Computer Hardware

Question #89

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Which component is responsible for fan control in a PC?

A. Hard disk controller

B. RAM

C. BIOS/UEFI

D. CPU only

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Correct Answer: Option C

Explanation:
BIOS manages hardware including cooling.

This question belongs to: Computer Computer Hardware

Question #90

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Line printers are used for:

A. Photo printing

B. High-speed bulk printing

C. Home use

D. Color graphics

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Correct Answer: Option B

Explanation:
They are high-volume impact printers.

This question belongs to: Computer Computer Hardware

Question #91

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What is the role of Northbridge chipset?

A. Connects CPU to RAM and graphics

B. Manages power supply

C. Audio processing

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

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A common wireless input device is:

A. USB scanner

B. Wired keyboard

C. Bluetooth mouse

D. VGA monitor

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Correct Answer: Option C

Explanation:
Bluetooth enables wireless connectivity.

This question belongs to: Computer Computer Hardware

Question #93

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Flash memory is a type of:

A. Magnetic storage

B. Volatile RAM

C. Optical storage

D. Non-volatile EEPROM variant

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Correct Answer: Option D

Explanation:
Used in USB drives and SSDs.

This question belongs to: Computer Computer Hardware

Question #94

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What is ghosting in monitors?

A. Blurry moving images due to slow response

B. Color inaccuracy

C. Permanent burn-in

D. High brightness

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Correct Answer: Option A

Explanation:
Response time affects ghosting in displays.

This question belongs to: Computer Computer Hardware

Question #95

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Which port is used for high-speed data transfer in modern systems?

A. Parallel port

B. USB 3.0 or Thunderbolt

C. Serial port

D. PS/2 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

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The process of converting analog to digital in scanners is done by:

A. CU

B. ALU

C. DAC

D. ADC

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Correct Answer: Option D

Explanation:
Analog to Digital Converter digitizes scanned data.

This question belongs to: Computer Computer Hardware

Question #97

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Which hardware failure often causes 'blue screen' errors?

A. Damaged keyboard

B. Monitor cable

C. Printer jam

D. Faulty RAM

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Correct Answer: Option D

Explanation:
Bad RAM is a common cause of system crashes.

This question belongs to: Computer Computer Hardware

Question #98

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What is aspect ratio in monitors?

A. Pixel density

B. Ratio of width to height of display

C. Refresh rate

D. Number of colors

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Correct Answer: Option B

Explanation:
Common ratios are 16:9 and 16:10.

This question belongs to: Computer Computer Hardware

Question #99

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Which device uses a ribbon for printing?

A. Dot matrix printer

B. Inkjet printer

C. Thermal printer

D. Laser printer

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Correct Answer: Option A

Explanation:
Dot matrix uses inked ribbon.

This question belongs to: Computer Computer Hardware

Question #100

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The number of bits processed by CPU at a time is called:

A. Byte size

B. Word size

C. Clock cycle

D. Bus width

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Correct Answer: Option B

Explanation:
Word length or bus width, e.g., 64-bit processor.

This question belongs to: Computer Computer Hardware

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