Which element is essential for bones? MCQ with Answer and Explanation

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Which element is essential for bones?

A. Magnesium

B. Calcium

C. Sodium

D. Potassium

Answer: Option B

Solution (By JKSSB Mock Tests)

Calcium is the primary mineral component of bones and teeth.

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Who proposed the theory of evolution by natural selection?

A. Alfred Russel Wallace

B. Jean-Baptiste Lamarck

C. Gregor Mendel

D. Charles Darwin

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Correct Answer: Option D

Explanation:
Charles Darwin published 'On the Origin of Species' detailing natural selection.

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Artemis programme is led by:

A. CNSA

B. ESA

C. NASA

D. ISRO

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Correct Answer: Option C

Explanation:
NASA's Artemis aims to return humans to the Moon.

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Question #3

Which instrument is used for observing distant objects in space?

A. Microscope

B. Periscope

C. Telescope

D. Kaleidoscope

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Correct Answer: Option C

Explanation:
A telescope is an optical instrument designed to make distant objects appear nearer.

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