A convex lens forms a real and inverted image of same size when object is at MCQ with Answer and Explanation

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A convex lens forms a real and inverted image of same size when object is at

A. Between F and 2F

B. F

C. 2F

D. Infinity

Answer: Option C

Solution (By JKSSB Mock Tests)

At 2F, image at 2F, same size, real inverted.

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Question #1

Latent heat of fusion ice = 336 kJ/kg. Heat to melt 3 kg ice at 0°C:

A. 1008 kJ

B. 336 kJ

C. 672 kJ

D. 112 kJ

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Correct Answer: Option A

Explanation:
Q = mL = 3×336 = 1008 kJ. Direct latent heat formula application. Memory tip: 'Phase change: Q = mL; no temperature change'. Calorimetry calculation frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2

The colour with maximum wavelength in visible spectrum is

A. Green

B. Blue

C. Red

D. Violet

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Correct Answer: Option C

Explanation:
Red ~700 nm.

This question belongs to: Science Physics

Question #3

Mercury is used in thermometers because it

A. Is transparent

B. Has low boiling point

C. Wets glass

D. Has uniform expansion and is opaque

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Correct Answer: Option D

Explanation:
Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

This question belongs to: Science Physics

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