Which device is used to input data from a printed paper? MCQ with Answer and Explanation

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Which device is used to input data from a printed paper?

A. Touchscreen

B. Webcam

C. Microphone

D. Scanner

Answer: Option D

Solution (By JKSSB Mock Tests)

A scanner converts printed text and images into digital data.

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Question #1

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Which of the following functions is completely handled by the internal Control Unit of a standard Von Neumann processor architecture?

A. Decoding instructions fetched from memory.

B. Comparing string lengths.

C. Adding two floating-point numbers.

D. Storing files permanently.

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Correct Answer: Option A

Explanation:
The Control Unit interprets and decodes instruction opcodes, orchestrating how data moves among registers and processing execution units.

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Question #2

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Which of the following is a characteristic of minicomputers?

A. Multi-user and moderate cost

B. Used in space research

C. High cost and large size

D. Single-user and low cost

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Correct Answer: Option A

Explanation:
Minicomputers are multi-user systems with moderate cost, bridging micros and mainframes.

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Question #3

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What is the purpose of the power-on self-test (POST)?

A. Loads the OS

B. Installs drivers

C. Checks hardware functionality

D. Checks for viruses

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Correct Answer: Option C

Explanation:
POST runs diagnostics on hardware like RAM and drives to ensure they work before booting.

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