Heat required to convert 1 g of ice at 0°C to water at 0°C is (latent heat 80 cal/g) MCQ with Answer and Explanation

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Heat required to convert 1 g of ice at 0°C to water at 0°C is (latent heat 80 cal/g)

A. 80 cal

B. 540 cal

C. 1 cal

D. 100 cal

Answer: Option A

Solution (By JKSSB Mock Tests)

Latent heat of fusion of ice = 80 cal/g. So 1 g needs 80 cal. No temperature change.

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The colour of light with minimum wavelength in visible spectrum is

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Correct Answer: Option B

Explanation:
Violet ~400 nm, shortest wavelength.

This question belongs to: Science Physics

Question #2

Which of the following is an example of the Doppler effect?

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Correct Answer: Option C

Explanation:
Doppler effect: apparent change in frequency due to relative motion. Siren pitch changes as it approaches/recedes. Echo is reflection. Bending is diffraction. Fusion is nuclear reaction.

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Pressure at depth h in fluid: P = P₀ + ρgh. If depth doubles, pressure increase is:

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Correct Answer: Option B

Explanation:
Gauge pressure (excluding atmospheric) P_gauge = ρgh ∝ h. Doubling depth doubles gauge pressure. Total pressure P = P₀ + ρgh increases but not exactly double due to P₀ term. Question asks about pressure increase (ρgh part). Memory tip: 'Hydrostatic pressure ∝ depth'. Fundamental fluid statics concept frequently tested in competitive exams.

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