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Physics for IGCSE & O level - Thermal Effects (Section 3)

1
What is the energy required to convert a solid to liquid at its melting point called?
Answer
(B)
Latent heat of fusion
2
When water freezes, what happens to its volume?
Answer
(B)
It increases
3
What type of thermometer uses a liquid to measure temperature?
Answer
(D)
Liquid-in-glass thermometer
4
If you increase the humidity, what happens to the rate of evaporation?
Answer
(B)
Evaporation decreases.
5
In a hot water system, what process is used to circulate the water?
Answer
(C)
Convection
6
How does the kinetic theory explain the expansion of solids?
Answer
(C)
Particles speed up and spread apart.
7
Which of the following is an example of latent heat?
Answer
A
C
8
What unit is commonly used to measure temperature?
Answer
(C)
Degrees Celsius
9
What are the two factors that primarily determine the rate of evaporation?
Answer
A
B
10
What term describes the energy required to change 1 kg of a substance from liquid to gas at its boiling point?
Answer
(C)
Latent heat of vaporization
11
When a material changes from a liquid to a gas, is it a phase change?
Answer
(B)
Yes
12
In a bimetallic strip, why does the strip bend when heated?
Answer
(B)
The two metals have different expansion rates.
13
What type of energy is transferred by conduction?
Answer
(A)
Kinetic Energy
14
What kind of energy does a hot object contain?
Answer
(A)
Kinetic energy.
15
Which of the following statements about boiling is correct?
Answer
(D)
Boiling is a very rapid form of evaporation.
16
What is the change of state called when a gas changes into a liquid?
Answer
(C)
Condensation
17
In a hot water system, what is the role of the hot water rising?
Answer
(B)
To heat the entire house by convection.
18
What process does the Earth use to get heat from the sun?
Answer
(C)
Radiation
19
Which one of these is not a process of change of state of matter?
Answer
(D)
Convection
20
What happens to the energy of the molecules as a liquid evaporates?
Answer
(B)
The molecules lose energy
21
Which of the following are examples of poor thermal conductors (insulators)?
Answer
A
C
D
22
What is the relationship between the color of a surface and its absorption of radiation?
Answer
(A)
Darker colors absorb more radiation.
23
Which of the following materials has the highest specific heat capacity?
Answer
(A)
Water
24
What is the freezing point of water in degrees Celsius?
Answer
(A)
0
25
Which of the following factors affect the rate of evaporation?
Answer
A
B
C
D
26
What does the kinetic theory of matter explain?
Answer
(A)
The movement and behavior of particles
27
In the context of evaporation and cooling, what causes the cooling effect?
Answer
(A)
The faster particles leaving the liquid.
28
What is the primary method of heat transfer in liquids and gases?
Answer
(B)
Convection
29
What is an example of a good thermal insulator?
Answer
(C)
Wood
30
Which of the following is an example of thermal expansion?
Answer
(A)
A metal bridge expanding in the summer heat.
31
What is the relationship between the energy transferred and the mass and specific heat capacity?
Answer
(B)
Energy Transferred = mass x specific heat capacity x temperature change
32
What is the result when the warm air rises over the sea?
Answer
(A)
Sea breezes
33
Which of the following is an example of heat transfer by conduction?
Answer
(B)
Heat spreading through a metal spoon in hot coffee.
34
In a domestic hot water system, how is heat transferred to the water?
Answer
(D)
All the above.
35
In which state of matter do particles have the most kinetic energy?
Answer
(C)
Gas
36
How does humidity affect the rate of evaporation?
Answer
(B)
It decreases the rate of evaporation
37
Which material is a good thermal conductor?
Answer
(C)
Metal
38
What is the primary mechanism for heat transfer in a vacuum?
Answer
(C)
Radiation
39
Which is the unit for the measurement of specific heat capacity?
Answer
(A)
J/kg°C
40
Which factors affect the rate of heat transfer through a material by conduction?
Answer
A
B
C
D
41
What kind of motion does a gas's particles have?
Answer
(C)
Random, rapid movement
42
Which color is the best emitter of thermal radiation?
Answer
(B)
Black
43
What is the main process by which the Earth gains energy from the Sun?
Answer
(C)
Radiation
44
What is the relationship between temperature and the expansion of solids and liquids?
Answer
(C)
As temperature increases, solids and liquids expand.
45
What type of energy is required to transform a liquid into a gas?
Answer
(A)
Heat energy
46
What type of material is used to insulate homes?
Answer
A
B
C
47
If 2 kg of ice at 0°C melts to water at 0°C, how much energy is transferred? (Latent heat of fusion for ice = 336,000 J/kg)
Answer
(C)
672,000 J
48
What is the primary factor influencing the specific heat capacity of a substance?
Answer
(C)
The type of material
49
What type of thermometer is most likely used in a cooking oven?
Answer
(D)
Bimetallic strip
50
What type of surface is a good emitter of thermal radiation?
Answer
B
C