Thermal Energy Transfer Quiz! Trivia
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What do you understand about energy transfer, and will you try the quiz to discover what you know? There are three ways of energy transfer. Do you know what these are? It could be simple, like throwing a ball, or intricate like an earthquake. Energy is an exciting subject, and taking the quiz will help you understand more.
- 1.
Density changes are responsible for which method of thermal energy transfer?
- A.
Convection only
- B.
Conduction only
- C.
Radiation only
- D.
Conduction, convection and radiation
Correct Answer
A. Convection onlyExplanation
Convection is the method of thermal energy transfer that is primarily caused by density changes. When a fluid, such as air or water, is heated, it becomes less dense and rises, while the cooler, denser fluid sinks. This movement of fluids transfers heat energy from one place to another. Therefore, the correct answer is convection only.Rate this question:
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- 2.
- A double-glazed window has two sheets of glass separated by a layer of air. Thermal energy is conducted and convected through the layer of air. The amount of conduction and convection varies with the thickness of the layer of air, as shown in the graph.
- A.
0.5 cm because there is little convection
- B.
1.0 cm because the total thermal energy transfer is least
- C.
2.0 cm because there is little conduction
- D.
1.5 cm because the total thermal energy transfer is small and conduction is low
Correct Answer
B. 1.0 cm because the total thermal energy transfer is leastExplanation
The correct answer is 1.0 cm because the total thermal energy transfer is least. This is because the graph shows that as the thickness of the layer of air increases, the amount of thermal energy transfer also increases. However, after reaching a certain point, the increase in thickness does not significantly affect the energy transfer. Therefore, the thickness of 1.0 cm produces the smallest energy transfer as it is the point where the increase in energy transfer starts to level off.Rate this question:
- 3.
The heat from the hot water in a metal radiator passes through the metal and then spreads around the room. What are the main processes by which the heat is transferred through the radiator and then spread around the room?
- A.
A
- B.
B
- C.
C
- D.
D
Correct Answer
B. BExplanation
The main process by which the heat is transferred through the radiator and then spread around the room is conduction. In conduction, heat is transferred through direct contact between objects or substances. In this case, the hot water in the metal radiator transfers heat to the metal through conduction. The metal, being a good conductor of heat, then spreads the heat to the surrounding air molecules in the room. This process continues until the heat is evenly distributed throughout the room.Rate this question:
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- 4.
Water at the top of a hot-water tank is heated and the water becomes hot. No water enters or leaves the tank.Water at the bottom of the tank stays cold for some time. Why is this?
- A.
Cold water at the top of the tank falls to the bottom.
- B.
Hot water at the bottom of the tank rises to the top.
- C.
Water is a poor conductor of heat.
- D.
The insulation is a poor conductor of heat.
Correct Answer
C. Water is a poor conductor of heat.Explanation
Water is a poor conductor of heat, which means it does not easily transfer heat from one part to another. When the water at the top of the tank is heated, it does not efficiently transfer the heat to the water at the bottom of the tank. Therefore, the water at the bottom stays cold for some time.Rate this question:
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- 5.
In a vacuum flask, which methods of heat transfer are prevented by the vacuum?
- A.
Conduction only
- B.
Convection only
- C.
Conduction and convection only
- D.
Conduction, convection, and radiation
Correct Answer
C. Conduction and convection onlyExplanation
In a vacuum flask, the vacuum prevents both conduction and convection. Conduction is the transfer of heat through direct contact between two objects, and since the vacuum flask has a vacuum between its inner and outer layers, there is no material or medium for heat to conduct through. Convection, on the other hand, is the transfer of heat through the movement of a fluid or gas. Again, since there is no fluid or gas present in the vacuum, convection is also prevented. However, radiation, which is the transfer of heat through electromagnetic waves, is not prevented by the vacuum and can still occur in a vacuum flask.Rate this question:
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- 6.
A student needs a double-walled glass vessel to contain a hot liquid.What reduces heat losses by radiation?
- A.
A vacuum in the space between the walls
- B.
Painting surface Q black
- C.
Painting surface R black
- D.
Painting surface S silver
Correct Answer
D. Painting surface S silverExplanation
Painting surface S silver reduces heat losses by radiation. Silver is a good reflector of heat and light, so it reflects the radiation back into the vessel, preventing it from escaping. This helps to maintain the temperature of the hot liquid inside the vessel. In contrast, painting surface Q black would absorb heat and increase heat losses, while painting surface R black would not reflect much heat and also increase heat losses. A vacuum in the space between the walls would reduce heat losses by conduction and convection, but not by radiation.Rate this question:
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- 7.
The diagrams show four identical cans with their outside surfaces painted either dull black or polished silver. Each can contains the same volume of water,initially at 80 °C.After five minutes in a cool room, which can contains the coolest water?
- A.
A
- B.
B
- C.
C
- D.
D
Correct Answer
A. AExplanation
Can A contains the coolest water because it is painted dull black, which is a better absorber of heat compared to polished silver. The dull black surface absorbs more heat from the surroundings, causing the water inside the can to lose heat faster and cool down more quickly. On the other hand, the polished silver surface reflects more heat away, resulting in slower heat loss and warmer water inside the can.Rate this question:
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- 8.
The diagrams show four cans in a cool room. They are painted as shown. One pair is filled with hot water and left to cool down. The other pair is filled with cold water and placed near infra-red heaters.The hot water in the black can cools more quickly than the hot water in the white can. The cold water in the black can heats up more quickly than the cold water in the white can.Which row shows the reasons for this?
- A.
A
- B.
B
- C.
C
- D.
D
Correct Answer
A. AExplanation
In the given question, it is stated that the hot water in the black can cools more quickly than the hot water in the white can. This can be explained by the fact that black absorbs more heat and radiates it faster than white. Similarly, it is also mentioned that the cold water in the black can heats up more quickly than the cold water in the white can. This can be attributed to the fact that black also absorbs heat faster than white. Therefore, the correct row that shows the reasons for this is A.Rate this question:
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- 9.
