Which of the following is an optical input device? MCQ with Answer and Explanation

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Which of the following is an optical input device?

A. Joystick

B. Barcode Reader

C. Mouse

D. Keyboard

Answer: Option B

Solution (By JKSSB Mock Tests)

Barcode reader uses optical technology to scan barcodes.

This question belongs to: Computer Computer Hardware

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What is the purpose of a UPS?

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B. Ultra Power Saver

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Correct Answer: Option A

Explanation:
Provides temporary power during outages.

This question belongs to: Computer Computer Hardware

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What is the standard voltage supplied by SMPS to motherboard?

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Correct Answer: Option B

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SMPS provides various DC voltages required by components.

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Time to position read/write head.

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