A barcode scanner uses: MCQ with Answer and Explanation

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A barcode scanner uses:

A. Magnetic fields

B. Thermal sensors

C. Ink detection

D. Laser or camera to read codes

Answer: Option D

Solution (By JKSSB Mock Tests)

Optical recognition.

This question belongs to: Computer Computer Hardware

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Question #1

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Which device converts mechanical movement into digital signals?

A. Mouse or joystick

B. Scanner

C. Printer

D. Monitor

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Correct Answer: Option A

Explanation:
Pointing devices translate movement.

This question belongs to: Computer Computer Hardware

Question #2

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A laser mouse uses:

A. Laser for better surface compatibility

B. LED only

C. Mechanical

D. Ball

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Correct Answer: Option A

Explanation:
Precision tracking.

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Question #3

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The cache hit ratio indicates:

A. Memory failure

B. Printer efficiency

C. Efficiency of cache usage

D. Display quality

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Correct Answer: Option C

Explanation:
Higher is better.

This question belongs to: Computer Computer Hardware

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