Physics for IGCSE & O level - Thermal Effects (Section 8)
1
If a 2 kg block of copper is heated to 50°C, how much energy will it need if its specific heat capacity is 385 J/kg°C?
2
Which of the following is a unit of measurement for energy?
3
What is required for a liquid to change into a gas?
答え(A)
Absorption of thermal energy
4
What does specific heat capacity measure?
答え(D)
The energy required to raise the temperature of 1 kg of a substance by 1°C.
5
Which of these processes involves a change of state that *releases* energy?
6
Which state change releases energy?
7
Which material would be the best for insulating a house?
8
What are some examples of materials that are very good conductors of heat?
9
Which has a higher specific heat capacity: copper or water?
10
In the context of expansion, which of these will expand the most for the same temperature increase?
11
What is the name of the heat needed to turn a liquid into a solid?
12
What are the primary components of a thermos flask that work to minimize heat transfer?
13
Which of these is a good example of thermal conduction?
答え(C)
A metal spoon heating up in hot soup.
14
In which situation is convection most likely to occur?
答え(C)
Hot air rising from a fire.
15
Which of these is a good example of convection?
16
In the Celsius scale, what is the freezing point of water?
17
What is the process by which a gas changes to a liquid?
18
What energy change occurs when a liquid becomes a solid?
19
Which of the following is an example of an insulator?
20
Which of the following best describes the process of convection?
答え(C)
Transfer of energy by the movement of fluids.
21
What causes the expansion of solids and liquids when heated?
答え(C)
The particles move more and occupy more space.
22
Which surface type will cool down faster when left in sunlight?
23
Which of the following is a good example of how specific heat capacity can be used in practice?
答え(B)
To design efficient cooling systems.
24
What is the energy needed to change 1 kg of a substance from a liquid to a gas called?
答え(C)
Latent heat of vaporization
25
How does a thermos flask minimize heat loss?
答え(C)
By reducing conduction, convection, and radiation.
26
What causes convection currents in a liquid?
答え(B)
Differences in liquid density due to temperature variations
27
What happens to particles in a solid as its temperature rises?
28
What is the specific latent heat of fusion?
答え(C)
The energy required to change the state of 1 kg of a substance from solid to liquid.
29
What is required for a substance to change state?
答え(C)
The absorption or release of thermal energy.
30
What is the process called when solids change directly into gases?
31
What is the formula for calculating energy transferred during a phase change?
32
What does the text say about the boiling point of water?
答え(B)
The boiling point is 100°C.
33
What happens to the temperature during the melting process?
34
What is the process described as 'the transfer of thermal energy'?
35
What effect does heat generally have on the volume of a solid?
36
What type of surface is a good reflector of thermal radiation?
37
What would you use to calculate the energy needed to melt ice?
答え(B)
Mass x latent heat of fusion
38
Which of the following describes how to calculate the thermal capacity of an object?
答え(A)
Mass * specific heat capacity
39
What happens when a solid becomes a liquid?
答え(D)
The particles start to slide past each other
40
What happens to the air pressure as the temperature rises?
41
Which metal is often found in bimetallic strips used in thermostats?
42
In the context of thermal expansion, which materials is used in Thermometers?
43
What causes wind in the Earth's atmosphere?
44
Which process describes water changing from a liquid to a gas?
