Heat is a form of MCQ with Answer and Explanation
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Question #1
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A block of wood floats in water with 60% of its volume submerged. In a liquid of density 0.8 g/cm³, the fraction of volume submerged will be:
Correct Answer: Option D
Explanation:
From floatation: ρ_wood/ρ_water = fraction submerged in water = 0.6. Thus ρ_wood = 0.6 g/cm³ (since ρ_water = 1 g/cm³). In new liquid (ρ_l = 0.8 g/cm³), fraction submerged f = ρ_wood/ρ_l = 0.6/0.8 = 0.75 = 75%. This uses the principle that fraction submerged equals density ratio. Memory aid: 'f = ρ_object / ρ_fluid'. Such comparative buoyancy problems test application of Archimedes' principle across scenarios, common in competitive exams. Always maintain consistent units (g/cm³ here simplifies calculation).
From floatation: ρ_wood/ρ_water = fraction submerged in water = 0.6. Thus ρ_wood = 0.6 g/cm³ (since ρ_water = 1 g/cm³). In new liquid (ρ_l = 0.8 g/cm³), fraction submerged f = ρ_wood/ρ_l = 0.6/0.8 = 0.75 = 75%. This uses the principle that fraction submerged equals density ratio. Memory aid: 'f = ρ_object / ρ_fluid'. Such comparative buoyancy problems test application of Archimedes' principle across scenarios, common in competitive exams. Always maintain consistent units (g/cm³ here simplifies calculation).
Question #2
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Instrument measuring humidity:
Correct Answer: Option B
Explanation:
Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.
Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.
Question #3
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An object of mass 10 kg is moving with velocity 5 m/s. Its kinetic energy is
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