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Class 11 Physics Practice Test: Thermal Properties of Matter - Heat Transfer
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Heat transfer describes the flow of heat (thermal energy) due to temperature differences and the subsequent temperature distribution and changes.

Class 11 Physics Practice Test: Thermal Properties of Matter - Heat Transfer
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12 Questions

1. What is the net amount of energy per unit time being received by a body having a temperature of 40 °C in a surrounding of 60°C? (The surface area of body = 2m2, σ = 5.67*10-8W/ m2K4 & emissivity of 0.4).
2. What is the net amount of energy per unit time being received by a body having a temperature of 40 °C in a surrounding of 60°C? (The surface area of body = 2m2, σ = 5.67*10-8W/ m2K4 & emissivity of 0.4).
3. When water is kept in a very hot pan, the entire water heats up. Which mode of heat transfer is responsible for this?
4. Select the correct statement.
5. The sun emits light having maximum intensity at a wavelength 468nm. Assume emissivity of sun is 1. Calculate its surface temperature. σ= 5.67*10-8W/m2K4.
6. The electromagnetic energy emitted by a perfect radiator corresponding to a temperature T and surface area A is?
7. At a given temperature a body emits energy of a single wavelength corresponding to that temperature. True or False?
8. Two spheres, A & B, are made up of the same material. The radius of A is twice that of B, while the temperature of A is half that of B. What is their ratio of energy emitted per unit time (EA : EB)?
9. A steel and a copper bar are joined end to end. The area of the steel bar is half the area of the copper bar. Their lengths are equal to 10cm each. Temperature of free ends of steel & copper rod are 0°C & 100°C respectively. KS = 50 J/smK & KC =384 J/smK. Calculate equivalent thermal conductivity of the combined bar.
10. If we hold a metal rod from one end and dip the other in a source of fire, what will happen to the temperature of the rod at steady state?
11. If we hold a metal rod from one end and dip the other in a source of fire, what will happen to the temperature of the rod at steady state?
12. A steel and a copper bar are joined end to end. The area of the steel bar is half the area of the copper bar. Their lengths are equal to 10cm each. Temperature of free ends of steel & copper rod are 0°C & 100°C respectively. KS = 50 J/smK & KC =384 J/smK. Calculate equivalent thermal conductivity of the combined bar.

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