The magnifying power of a simple microscope is maximum when the image is formed at MCQ with Answer and Explanation

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The magnifying power of a simple microscope is maximum when the image is formed at

A. 2F

B. Infinity

C. Focus

D. Near point

Answer: Option D

Solution (By JKSSB Mock Tests)

M = 1 + D/f when image at near point (D = 25 cm). For infinity, M = D/f. So max at near point.

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Practice More Physics Questions

Question #1

The core of a transformer is laminated to reduce

A. Flux leakage

B. Eddy current loss

C. Hysteresis loss

D. Copper loss

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Correct Answer: Option B

Explanation:
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.

This question belongs to: Science Physics

Question #2

Two 60 W bulbs are connected in series across 220 V. Each bulb power becomes (approximately)

A. 15 W

B. 30 W

C. 120 W

D. 60 W

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Correct Answer: Option A

Explanation:
Each bulb R = 220²/60 ≈ 807 Ω. Series total R=1614 Ω, current = 220/1614 ≈0.136 A. Power per bulb = I²R = (0.136)²×807 ≈ 15 W.

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Question #3

Rainbow formation involves:

A. Dispersion and total internal reflection

B. Diffraction

C. Reflection only

D. Refraction only

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Correct Answer: Option A

Explanation:
Rainbow: sunlight enters raindrop (refraction + dispersion), reflects internally (TIR), exits with further refraction. Primary rainbow: one TIR; secondary: two TIRs. Memory tip: 'Rainbow = refraction + dispersion + TIR in water droplets'. Application question testing atmospheric optics, frequently appearing in competitive exams.

This question belongs to: Science Physics

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