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 10
A hot air balloon rises because the air inside the balloon is heated. Which method of heat transfer causes the balloon to rise?
A metal spoon is placed in a hot cup of tea. After a while, the handle of the spoon becomes warm. Which method of heat transfer is responsible for this?
A person stands in front of a heater and feels warm. Which method of heat transfer is primarily responsible for this?
Calculate the amount of heat transferred if 200 g of water is heated from 20°C to 50°C. (Specific heat capacity of water = 4.18 J/g°C)
Calculate the rate of heat transfer through a wall 0.2 m thick, area 10 m², thermal conductivity 0.8 W/m·K, with a temperature difference of 30 K across it.
Describe one way to reduce heat loss by radiation in a building.
Describe the process of heat transfer by radiation.
Explain why convection does not occur in solids.
Explain why double-glazed windows help to reduce heat loss from a house.
Explain why metals feel colder than wood at the same temperature.
Heat transfer by conduction occurs mainly in which state of matter?
State one reason why vacuum flasks are effective at keeping liquids hot or cold.
State the law of heat conduction (Fourier’s Law) in words.
Which method of heat transfer is most effective in solids?
Which method of heat transfer is responsible for the formation of sea breezes?
A beaker containing water is heated from below. After a while, the temperature at the top of the water becomes nearly equal to the temperature at the bottom. Explain the process responsible for this temperature equalization.
A metal plate is exposed to sunlight and becomes hot. After some time, the other side of the plate also becomes warm. Which method(s) of heat transfer are involved in this process? Explain your answer.
A metal rod is heated at one end and the other end is kept in contact with a block of ice. After some time, the ice begins to melt. Explain the process of heat transfer involved and why the melting occurs.
A room is heated by a radiator placed under a window. Explain how all three methods of heat transfer (conduction, convection, and radiation) are involved in warming the room.
A wall is made of two layers: brick (thermal conductivity = 0.7 W/m·K, thickness = 0.15 m) and insulation (thermal conductivity = 0.04 W/m·K, thickness = 0.05 m). If the temperature difference across the wall is 25 K and the area is 8 m², calculate the total rate of heat transfer through the wall.
