Free physics question bank
heat transfer due to radiation questions with solutions
Practice Thermodynamics for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–8 of 8 questions
- MCQeasyThermodynamics
A body cools in 7 minutes from 60°C to 40°C. The temperature of the surroundings is 10°C. The temperature of the body after the next 7 minutes is:
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JEE Mains6 April 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumThermodynamics
A body cools from 80°C to 60°C in 5 minutes. The surroundings are at 20°C. Using the approximation applied in the source solution, the time to cool from 60°C to 40°C is:
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JEE Mains12 April 2023Shift 1Morning Shift
Open question & full solution → - NumericdifficultThermodynamics
Two identical black-body plates P and Q are at temperatures Tₚ and Tq, with Tq < Tₚ. The net radiative power per unit area from P to Q is W₀. Two identical intermediate plates are then inserted between P and Q, and heat transfer occurs only between adjacent plates. In steady state the power per unit area is Wₛ. Find W₀/Wₛ.
JEE Advanced 2025 Paper 1
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A bowl filled with very hot soup cools from 98°C to 86°C in 2 minutes when the room temperature is 22°C. How long will it take to cool from 75°C to 69°C?
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JEE Mains25 January 2023Morning Shift
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A body cools from 40°C to 24°C in 4 min in surroundings at 16°C. Using the same Newton's-law-of-cooling approximation as the source solution, its temperature after a further 4 min is:
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JEE Mains 2025 24 Jan Evening Shift
Open question & full solution → - MCQmediumThermodynamics
Two spherical black bodies have radii 0.8 m and 0.2 m and temperatures 400 K and 800 K respectively. Find the ratio P₁/P₂ of their rates of heat loss.
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JEE Main 2025 (Online) 22 jan morning Shift
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A wire of length 10 cm and diameter 0.5 mm radiates 94.2 W at temperature 1727°C. Its emissivity is x/8. Given σ = 6.0×10⁻⁸ W m⁻² K⁻⁴ and π = 3.14, find x.
JEE Mains 2025 7 April Morning Shift
Open question & full solution → - NumericmediumThermodynamics
A body cools from 60°C to 40°C in 6 minutes. If temperature of surroundings is 10°C, then after the next 6 minutes, its temperature will be ____ °C.
JEE Mains29 January 2023Shift 1Morning Shift
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