The energy emitted by the Sun is primarily a result of: MCQ with Answer and Explanation

The energy emitted by the Sun is primarily a result of:
A. Chemical combustion of gases.
B. Nuclear fusion of hydrogen into helium.
C. Radioactive decay of uranium.
D. Nuclear fission of heavy elements.
Answer: Option B
Solution (By JKExamLibrary)
The Sun and other stars generate their immense energy through nuclear fusion. In the Sun's core, immense gravitational pressure and heat cause hydrogen nuclei (protons) to overcome electrostatic repulsion and fuse together to form helium nuclei. This fusion process releases vast amounts of energy according to Einstein's E=mc².

This question belongs to: Science Physics

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Myopia (nearsightedness) is corrected by using
A. Cylindrical lens
B. Convex lens
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Correct Answer: Option C


Explanation:
Myopic eye focuses image in front of retina. A diverging (concave) lens spreads light so image falls on retina. Hypermetropia (farsightedness) corrected by convex lens. Bifocals for presbyopia. Cylindrical for astigmatism.

This question belongs to: Science Physics
Question #2 Report Error
Work done by a force is zero when the angle between force and displacement is
A. 45°
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C. 90°
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Correct Answer: Option C


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This question belongs to: Science Physics
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The number of significant figures in 3.00 × 10⁸ is
A. 3
B. 2
C. 1
D. 8

Correct Answer: Option A


Explanation:
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This question belongs to: Science Physics