Optical Mouse uses which technology to detect movement? MCQ with Answer and Explanation

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Optical Mouse uses which technology to detect movement?

A. LED and sensor

B. Ultrasonic waves

C. Mechanical ball

D. Magnetic field

Answer: Option A

Solution (By JKSSB Mock Tests)

Optical mice use light-emitting diodes and sensors.

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

A. To increase resolution

B. To feed multiple sheets automatically

C. To print scanned documents

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Correct Answer: Option B

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

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What is the typical power consumption of an idle modern monitor?

A. Low, around 20-50W

B. Negligible only

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Correct Answer: Option A

Explanation:
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Which of the following is a volatile storage device?

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Correct Answer: Option B

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