Free physics question bank
heat transfer due to radiation questions with solutions
Practice Thermodyanmics for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–5 of 5 questions
- MCQmediumThermodyanmics
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:
Options
JEE Mains12 April 2023Shift 1Morning Shift
Open question & full solution → - IntegermediumThermodyanmics
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 → - MCQmediumThermodyanmics
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.
Options
JEE Main 2025 (Online) 22 jan morning Shift
Open question & full solution → - MCQmediumThermodyanmics
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:
Options
JEE Mains 2025 24 Jan Evening Shift
Open question & full solution → - MCQmediumThermodyanmics
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?
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution →