A barcode scanner uses: MCQ with Answer and Explanation

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A barcode scanner uses:

A. Ink detection

B. Laser or camera to read codes

C. Magnetic fields

D. Thermal sensors

Answer: Option B

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 printer is impact-based and noisy?

A. 3D Printer

B. Laser Printer

C. Dot Matrix Printer

D. Inkjet Printer

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Correct Answer: Option C

Explanation:
Dot matrix printers use impact technology creating noise.

This question belongs to: Computer Computer Hardware

Question #2

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The PCIe lanes are used for:

A. Low speed peripherals

B. Audio

C. Power only

D. High bandwidth connections to GPU and SSDs

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Correct Answer: Option D

Explanation:
Scalable high-speed interface.

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Question #3

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Which component has direct memory access (DMA)?

A. Hard disk controller

B. Keyboard

C. Speaker

D. Monitor

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Correct Answer: Option A

Explanation:
DMA allows devices to access memory without CPU.

This question belongs to: Computer Computer Hardware

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