The mass number of an element is sum of MCQ with Answer and Explanation

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The mass number of an element is sum of

A. Protons only

B. Neutrons and electrons

C. Protons and electrons

D. Protons and neutrons

Answer: Option D

Solution (By JKExamLibrary)

Mass number A = Z + N.

This question belongs to: Science Physics

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Sunlight travel time to Earth:

A. 8 hours

B. 8 days

C. 8 seconds

D. 8 minutes

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Correct Answer: Option D

Explanation:
Distance ≈ 1.5×10¹¹ m, c = 3×10⁸ m/s ⇒ t = 500 s ≈ 8.3 min. Standard astronomical fact. Memory aid: 'Sunlight takes 8 minutes; we see Sun as it was 8 min ago'. Scale knowledge frequently tested in competitive exams.

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Which of the following is an application of electromagnetic induction?

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C. Dynamo

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Correct Answer: Option C

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This question belongs to: Science Physics

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Which is the most penetrating radiation?

A. Gamma

B. X-rays

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Correct Answer: Option A

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Gamma rays highest penetration, alpha least.

This question belongs to: Science Physics

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