An object is placed at 2F of a convex lens. Image formed is MCQ with Answer and Explanation

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An object is placed at 2F of a convex lens. Image formed is

A. Virtual, inverted, same size

B. Virtual, erect, magnified

C. Real, inverted, diminished

D. Real, inverted, same size

Answer: Option D

Solution (By JKSSB Mock Tests)

At 2F, image also at 2F, real inverted same size. Used in photocopiers.

This question belongs to: Science Physics

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TIR used in:

A. Optical fibers

B. Neither

C. Diamond brilliance

D. Both

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Correct Answer: Option D

Explanation:
Optical fibers: TIR confines light in core. Diamonds: high n gives small θ_c, causing multiple TIRs for sparkle. Memory aid: 'TIR applications: fibers (communication), diamonds (optics)'. Optics application frequently tested in competitive exams.

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Question #2

If the percentage error in measurement of radius of a sphere is 2%, the percentage error in volume is

A. 4%

B. 8%

C. 6%

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Correct Answer: Option C

Explanation:
Volume V = (4/3)πr³, so ΔV/V = 3 Δr/r. Percentage error in volume = 3 × 2% = 6%.

This question belongs to: Science Physics

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Solar cells convert:

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B. Electrical energy to light energy

C. Chemical energy to electrical energy

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Correct Answer: Option A

Explanation:
Solar cells (photovoltaic cells) convert light energy (photons) directly into electrical energy via the photovoltaic effect: photons excite electrons in semiconductor material, creating electron-hole pairs that generate voltage. This is distinct from solar thermal (light to heat to electricity) or batteries (chemical to electrical). Memory aid: 'Photo = light; voltaic = electricity'. This renewable energy application question tests knowledge of energy conversion principles, common in competitive exams. Always distinguish photovoltaic (direct light-electricity) from other solar technologies.

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