What is the SI unit of time? MCQ with Answer and Explanation

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What is the SI unit of time?

A. Millisecond

B. Second

C. Minute

D. Hour

Answer: Option B

Solution (By JKSSB Mock Tests)

The second (s) is the SI base unit of time.

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Question #1

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Which vaccine technology was used for Covaxin?

A. mRNA

B. Viral vector

C. Protein subunit

D. Inactivated virus

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Correct Answer: Option D

Explanation:
Covaxin is an inactivated whole-virion vaccine by Bharat Biotech.

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Question #2

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The internet was developed from which project?

A. ARPANET

B. ISRO

C. NASA

D. CERN

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Correct Answer: Option A

Explanation:
ARPANET was the precursor to the modern internet.

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Question #3

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Which type of mirror is used in car rearview mirrors?

A. None

B. Convex

C. Concave

D. Plane

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Correct Answer: Option B

Explanation:
Convex mirrors are used because they provide a wider field of view.

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