Sign In

Physics for IGCSE & O level - Thermal Effects (Section 6)

1
What is the definition of latent heat?
Answer
(B)
The heat absorbed or released during a phase change.
2
Which of the following is NOT a state of matter considered on thermal effects?
Answer
(D)
Plasma
3
What type of surface absorbs thermal radiation best?
Answer
(D)
Dull and black
4
The process of a liquid becoming a solid is known as which?
Answer
(D)
Freezing
5
What happens to most solids when their temperature is increased?
Answer
(B)
They expand.
6
Which of the following is an example of a good conductor?
Answer
(B)
Aluminum
7
When ice melts at 0°C, the energy added to the ice is used to?
Answer
(B)
Break the bonds between the water molecules.
8
Which of the following are mentioned in the context of expansion?
Answer
A
B
C
9
What is the main type of heat transfer involved in the operation of a refrigerator?
Answer
(D)
Evaporation and condensation
10
What is the primary mechanism of heat transfer in the Earth's atmosphere?
Answer
(B)
Convection
11
Which of the following best describes convection?
Answer
(C)
Heat transfer by the movement of fluids.
12
What causes land and sea breezes?
Answer
(C)
Convection
13
How do insulating materials help to reduce heat loss from a house?
Answer
(B)
By reducing convection currents.
14
What is the primary purpose of the experiment showing the heating of the air?
Answer
(A)
To show the pressure increases as temperature increases.
15
What is the unit of measurement for temperature on the Kelvin scale?
Answer
(A)
Kelvin (K)
16
What is the name of the scientist who discovered Brownian motion?
Answer
(A)
Robert Brown
17
What is the primary method of heat transfer in a liquid that is heated from below?
Answer
(B)
Convection
18
What is an example of thermal radiation?
Answer
(A)
Heat from a fire.
19
What happens to air as it gets closer to the ground on a warm day?
Answer
(B)
It becomes less dense.
20
What is the relationship between the kinetic energy of particles and the temperature of a substance?
Answer
(C)
As temperature increases, kinetic energy increases.
21
What is the role of insulating materials in a home?
Answer
(C)
To reduce the rate of heat transfer.
22
Which of the following is not a form of thermal energy?
Answer
(C)
Specific Heat Capacity
23
What happens to a gas when it is heated at constant pressure?
Answer
(C)
It expands
24
What is the name given to the energy needed to change a substance from a liquid to a gas?
Answer
(C)
Latent heat of vaporization
25
What is meant by absolute zero?
Answer
(A)
The temperature at which all molecular motion stops.
26
Which of the following is NOT listed as a topic under 'Thermal effects'?
Answer
(D)
Molecular Motion
27
What process explains why clothes dry on a washing line?
Answer
(C)
Evaporation
28
What happens to the temperature of the Earth if it absorbs thermal radiation faster than it radiates it?
Answer
(D)
It warms up
29
What is the effect on the size of the particles when the temperature increases?
Answer
(B)
They move faster
30
What property of a material determines its ability to store thermal energy?
Answer
(B)
Specific heat capacity
31
What is the name given to the motion of particles in a gas or liquid that is caused by collisions with other particles?
Answer
(C)
Brownian motion
32
What happens to the particles in a gas when its temperature increases?
Answer
(B)
They move faster and spread further apart.
33
What property of a substance determines how much energy is needed to change its temperature?
Answer
(B)
Specific heat capacity
34
What happens to the volume of a gas when the pressure increases, assuming the temperature is constant?
Answer
(B)
It decreases.
35
What type of surface best reflects thermal radiation?
Answer
(C)
White and shiny
36
What is the unit of measurement for specific heat capacity?
Answer
(B)
J/kg°C
37
What is latent heat?
Answer
(C)
Heat absorbed or released during a change of state.
38
How does the amount of mass affect the energy transferred during a temperature change?
Answer
(B)
The mass is directly proportional to the energy transferred.
39
What is the process that explains the movement of small particles in a liquid or gas?
Answer
(B)
Brownian Motion
40
Which of the following is an example of convection?
Answer
(C)
Wind blowing across a field.
41
What is a key difference between solids and gases regarding their particles?
Answer
(A)
Solids have fixed positions while gases do not.
42
What is an example of the application of latent heat of fusion?
Answer
(A)
Melting ice.
43
What is the relationship between temperature and the average kinetic energy of particles?
Answer
(B)
They are directly proportional
44
What is the process by which a substance changes from a solid to a liquid?
Answer
(B)
Melting
45
What is absolute zero in Celsius?
Answer
(C)
-273.15°C
46
What is the most effective type of surface for emitting and absorbing thermal radiation?
Answer
(D)
Black and dull
47
What is the primary method of heat transfer in a gas?
Answer
(B)
Convection
48
What type of energy is associated with the motion of particles?
Answer
(B)
Kinetic Energy
49
Which of these factors doesn't affect the rate of evaporation?
Answer
(B)
The air pressure
50
What would be the effect of increasing the temperature of an iron rod?
Answer
(A)
It's length would increase.