Gamma rays are MCQ with Answer and Explanation

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Gamma rays are

A. Helium nuclei

B. Fast electrons

C. Electromagnetic radiation of very high frequency

D. Slow neutrons

Answer: Option C

Solution (By JKSSB Mock Tests)

Gamma rays are photons, electromagnetic waves with wavelengths shorter than X-rays, produced in nuclear transitions. No mass, no charge. Highly penetrating. Stopped by thick lead.

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Question #1

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Myopia (nearsightedness) is corrected by using

A. Cylindrical lens

B. Concave lens

C. Convex lens

D. Bifocal lens

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Correct Answer: Option B

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.

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Question #2

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Resistance of wire: R = ρL/A. If length tripled and area doubled, new R is:

A. 3R

B. 6R

C. R/6

D. 1.5R

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Correct Answer: Option D

Explanation:
R' = ρ(3L)/(2A) = (3/2)(ρL/A) = 1.5R. Resistance scales directly with length, inversely with area. Memory aid: 'R ∝ L/A; changes multiply'. Proportional reasoning problem testing resistance formula, frequently appearing in competitive electricity sections.

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Question #3

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The half-life of a radioactive substance is 5 years. The fraction disintegrated after 15 years is

A. 1/2

B. 7/8

C. 1/8

D. 1/3

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Correct Answer: Option B

Explanation:
After 3 half-lives, remaining = (1/2)³ = 1/8, so disintegrated = 1 - 1/8 = 7/8. Fraction disintegrated = 7/8. Option A remaining. So B.

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