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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Question #21 Report Error
What does the term 'resolution' refer to in monitors?
A. Brightness level
B. Number of colors displayed
C. Refresh rate
D. Number of pixels on the screen

Correct Answer: Option D


Explanation:
Resolution is the total number of pixels (e.g., 1920x1080).

This question belongs to: Computer Computer Hardware
Question #22 Report Error
Which hardware component is responsible for executing arithmetic and logical operations?
A. CU
B. ALU
C. I/O Unit
D. MU

Correct Answer: Option B


Explanation:
Arithmetic Logic Unit (ALU) performs calculations and logical operations.

This question belongs to: Computer Computer Hardware
Question #23 Report Error
A device that produces sound output is called:
A. Speaker
B. Keyboard
C. Scanner
D. Monitor

Correct Answer: Option A


Explanation:
Speakers are audio output devices.

This question belongs to: Computer Computer Hardware
Question #24 Report Error
What is the main disadvantage of CRT monitors compared to LCD?
A. Higher cost
B. Bulkier and heavier
C. Lower resolution
D. Poor color accuracy

Correct Answer: Option B


Explanation:
CRT monitors are bulkier due to the cathode ray tube technology.

This question belongs to: Computer Computer Hardware
Question #25 Report Error
Which memory is used to store BIOS instructions?
A. ROM
B. RAM
C. Cache
D. HDD

Correct Answer: Option A


Explanation:
ROM contains firmware like BIOS which is non-volatile.

This question belongs to: Computer Computer Hardware
Question #26 Report Error
Optical Mouse uses which technology to detect movement?
A. Ultrasonic waves
B. Magnetic field
C. LED and sensor
D. Mechanical ball

Correct Answer: Option C


Explanation:
Optical mice use light-emitting diodes and sensors.

This question belongs to: Computer Computer Hardware
Question #27 Report Error
What is the function of a graphics card?
A. To render images and videos
B. To process sound
C. To connect networks
D. To store data

Correct Answer: Option A


Explanation:
GPU (Graphics Processing Unit) handles visual rendering.

This question belongs to: Computer Computer Hardware
Question #28 Report Error
Inkjet printers are best suited for:
A. Photo quality color printing
B. Large format blueprints
C. High-volume black and white printing
D. Fast text documents only

Correct Answer: Option A


Explanation:
Inkjet printers excel in high-quality color prints like photos.

This question belongs to: Computer Computer Hardware
Question #29 Report Error
Which component connects the CPU to other parts of the motherboard?
A. North Bridge
B. South Bridge
C. All of the above
D. Front Side Bus

Correct Answer: Option C


Explanation:
Bridges and buses facilitate communication on the motherboard.

This question belongs to: Computer Computer Hardware
Question #30 Report Error
What type of device is a webcam?
A. Storage device
B. Processing device
C. Input device
D. Output device

Correct Answer: Option C


Explanation:
Webcam captures video input for the computer.

This question belongs to: Computer Computer Hardware