Heat Transfer Methods
Physics ⇒ Heat and Thermodynamics
Heat Transfer Methods starts at 7 and continues till grade 12.
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See sample questions for grade 12
A room is heated by a radiator. Explain how heat is transferred from the radiator to the air in the room.
Describe the process of convection and give one example from daily life.
Explain why double-glazed windows are effective in reducing heat loss.
Explain why metals feel colder than wood at the same temperature.
A 0.5 m thick wall with an area of 10 m² has a thermal conductivity of 0.8 W/m·K. If the temperature difference across the wall is 20 K, calculate the rate of heat transfer.
A 2 m² black surface at 500 K emits thermal radiation. If the Stefan-Boltzmann constant is 5.67 × 10⁻⁸ W/m²·K⁴, calculate the power radiated.
A metal rod of length 2 m and cross-sectional area 0.01 m² has its ends maintained at 100°C and 0°C. If the thermal conductivity of the metal is 200 W/m·K, calculate the rate of heat transfer through the rod.
A metal spoon is placed in a cup of hot tea. After some time, the handle of the spoon becomes warm. Which method of heat transfer is responsible for this?
Which law mathematically describes the rate of heat transfer by conduction?
(1) Newton's Law of Cooling
(2) Stefan-Boltzmann Law
(3) Fourier's Law
(4) Wien's Law
Which of the following factors does NOT affect the rate of heat transfer by radiation?
(1) Surface area
(2) Color of the surface
(3) Thickness of the material
(4) Temperature of the surface
Which of the following is an example of heat transfer by convection?
(1) Heating a metal rod at one end
(2) Boiling water in a pot
(3) Sunlight warming the Earth
(4) Touching a hot pan
Which of the following is NOT a factor affecting the rate of heat transfer by conduction?
(1) Thickness of the material
(2) Surface area
(3) Color of the material
(4) Thermal conductivity
A black surface is a better ________ and ________ of heat than a white surface.
Heat transfer by conduction occurs mainly in ________.
If the temperature difference across a wall is doubled, the rate of heat transfer by conduction will ________.
The process by which heat is transferred from the bottom to the top of a pot of soup is called ________.
True or False: All objects emit thermal radiation, regardless of their temperature.
True or False: In a vacuum, heat can be transferred by radiation but not by conduction or convection.
True or False: Radiation does not require a medium for heat transfer.
True or False: The rate of heat transfer by radiation increases as the fourth power of the absolute temperature.
