Physics for IGCSE & O level - Thermal Effects (Section 1)
1
Which type of surface is the best at reflecting thermal radiation and therefore appears cooler?
Відповідь
(C)
Shiny
2
Which state of matter has a fixed shape?
Відповідь
(A)
Solid
3
Which state of matter contains particles with the most kinetic energy?
Відповідь
(C)
Gas
4
Which type of wave does the sun emit that we can feel as heat?
Відповідь
(B)
Infrared waves
5
What causes the cooling effect experienced during evaporation?
Відповідь
(A)
The faster particles escape from the liquid.
6
What happens to the volume of a gas when heated at a constant pressure?
Відповідь
(A)
The volume increases.
7
What is a result of the convection of a hot water system?
Відповідь
(C)
Cool water sinks and warm water rises
8
What happens to the particles of a solid when it is heated?
Відповідь
(C)
They vibrate faster
9
What happens to the temperature during a change of state?
Відповідь
(C)
The temperature remains constant
10
What is the term used to describe the change in state from a liquid to a gas?
Відповідь
(C)
Vaporization
11
Why does a solid have a definite shape and volume?
Відповідь
(D)
All of the above.
12
What happens to most substances when they are heated?
Відповідь
(B)
They expand
13
What happens to the latent heat during melting?
Відповідь
(B)
It is absorbed
14
What type of insulation is most commonly used to reduce heat loss from a house?
Відповідь
(D)
All of the above
15
During the convection in a liquid, water rises upwards as a:
Відповідь
(D)
hotter water
16
How does increasing the temperature of a gas affect the pressure, assuming the volume is constant?
Відповідь
(B)
The pressure increases.
17
What is the name of the unit that measures the temperature?
Відповідь
(C)
Celsius
18
Which color is a poor absorber of thermal radiation?
Відповідь
(B)
White
19
What does the term 'absolute zero' represent?
Відповідь
(C)
The temperature at which molecular motion stops.
20
Which statement is correct concerning the kinetic theory of matter?
Відповідь
(C)
Particles in a gas move randomly and have little to no attraction to each other.
21
What is the effect of high specific heat capacity?
Відповідь
(A)
Materials heat up and cool down slowly
22
What happens to the rate of evaporation if you increase the surface area?
Відповідь
(B)
It increases
23
What is the process of heat transfer called that occurs in direct contact?
Відповідь
(A)
Conduction
24
What does a thermocouple thermometer measure?
Відповідь
(B)
The force generated between two dissimilar metals due to a temperature difference
25
Which is the formula for calculating energy transfer?
Відповідь
(B)
Energy Transferred = mass * specific heat capacity * temperature change
26
What is the main difference between a solid, liquid, and gas in terms of particle arrangement and movement?
Відповідь
(C)
Solids have a fixed arrangement with limited movement, liquids have a less ordered arrangement with more movement, and gases have a very random arrangement with fast movement.
27
Which factor is responsible for increasing the rate of evaporation?
Відповідь
A
C
28
Which statement is correct about the specific latent heat of fusion?
Відповідь
(B)
Energy is absorbed when a substance melts.
29
In a convection current, why does the warmer fluid rise?
Відповідь
(A)
It is less dense.
30
How does the presence of clouds affect the Earth's temperature?
Відповідь
(B)
They decrease the temperature by reflecting radiation
31
Why does a gas exert pressure on the walls of its container?
Відповідь
(C)
Because the gas molecules are colliding with the walls.
32
Which method of heat transfer is most significant in the oceans, transferring heat from the equator towards the poles?
Відповідь
(B)
Convection
33
Which of the following is a good thermal conductor?
Відповідь
(C)
Metal
34
In the context of evaporation, which of the following factors reduces the rate of evaporation?
Відповідь
(C)
Increasing the humidity
35
Which of the following explains why solids have a definite shape and volume?
Відповідь
(A)
Particles are tightly packed and held together by strong forces
36
What does convection require to occur?
Відповідь
(C)
A fluid
37
Which of the following is the correct unit for measuring the rate of heat transfer?
Відповідь
(B)
Watt (W)
38
What type of surface is a poor reflector of thermal radiation?
Відповідь
(A)
Black
39
What happens to the volume of a gas if its temperature decreases while keeping pressure constant?
Відповідь
(B)
The volume decreases.
40
How does the specific heat capacity of a substance relate to its ability to store thermal energy?
Відповідь
(A)
Directly proportional: higher heat capacity, more energy stored.
41
What is the name for the heat required to change the state of a substance from liquid to gas?
Відповідь
(C)
Latent heat of vaporization
42
Which term is defined as the total internal energy of a substance?
Відповідь
(C)
Internal energy
43
What is temperature?
Відповідь
(B)
The average kinetic energy of the particles in a substance.
44
What is the transfer of energy by electromagnetic waves called?
Відповідь
(C)
Radiation
45
What does latent heat cause during a state change?
Відповідь
(C)
Temperature to remain constant.
46
What is the main reason for using insulating materials in the construction of buildings?
Відповідь
(B)
To reduce heat transfer
47
What is the role of thermal radiation on the Earth?
Відповідь
(A)
Heating up the Earth
48
Which of these materials is typically used in a bimetallic strip?
Відповідь
(A)
Two different types of metal.
49
What is Brownian motion?
Відповідь
(D)
The random movement of particles suspended in a fluid.
50
What is the name of the phenomenon describing the random movement of particles?
