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Physics for IGCSE & O level - Forces And Energy (Section 2)

1
Which of the following is an example of the conversion of potential energy to kinetic energy?
Answer
(C)
A ball rolling down a hill
2
What are the disadvantages of generating energy using wind turbines?
Answer
A
B
3
What problem could using biofuels have?
Answer
(B)
Can lead to deforestation
4
What happens to energy when you spend it?
Answer
(C)
It transforms into other forms of energy.
5
What are the environmental problems with hydroelectric power?
Answer
A
B
6
Which of the following has a positive impact on the environment?
Answer
B
C
7
What are the benefits of nuclear energy?
Answer
(D)
All of the above
8
What is an advantage of the Pumped storage scheme?
Answer
A
C
9
What is the energy transformation in a solar panel?
Answer
(B)
Light to electrical
10
What is the main role of a generator in power production?
Answer
(B)
To produce electricity
11
Which of the following is an advantage of using renewable energy resources?
Answer
(C)
Reduced environmental impact
12
Which energy is released when fossil fuels are burned?
Answer
(B)
Thermal
13
What does the phrase "global warming" refer to?
Answer
(B)
An increase in the average temperature of Earth
14
What is the main source of air pollution from burning fuels?
Answer
(D)
Sulphur dioxide
15
Which of the following factors can affect the efficiency of a machine?
Answer
A
B
16
Which energy source is considered a renewable energy source?
Answer
(C)
Solar
17
What does the term 'non-renewable resource' refer to?
Answer
(B)
Resources that are not replenished
18
What does the efficiency of a motor indicate?
Answer
(C)
How much useful energy the motor produces compared to the energy it consumes
19
Which of the following affects the amount of gravitational potential energy an object has?
Answer
A
B
20
Which of these best describes a key challenge when using renewable energy sources?
Answer
(B)
Their availability can be inconsistent.
21
What is the rate at which work is done called?
Answer
(D)
Power
22
What is the SI unit for energy?
Answer
(B)
Joule (J)
23
What does the term "power" represent?
Answer
(B)
The rate at which work is done
24
What happens to the energy from a fast moving object if the object is brought to a stop?
Answer
(B)
The energy is converted to heat and sound energy.
25
What is the definition of work done in physics?
Answer
(A)
Force applied over a distance.
26
What form of energy can be stored as potential energy?
Answer
(C)
Gravitational
27
What type of energy is stored in a stretched or compressed object?
Answer
(B)
Elastic potential energy
28
Which of the following scenarios exemplifies work being done?
Answer
(C)
Lifting a box.
29
What is the main source for energy from the sun?
Answer
(B)
Nuclear fusion
30
What is the environmental impact of using biofuels?
Answer
(C)
They reduce carbon emissions
31
Which of the following best describes a pumped storage scheme?
Answer
(B)
Storing water in a reservoir to be released later.
32
What gases are produced by burning fossil fuels?
Answer
A
B
C
33
What are the two main inputs for calculating efficiency?
Answer
(C)
Total energy input and useful energy output
34
Which of the following is an example of a non-renewable energy source?
Answer
(C)
Natural gas
35
What happens to the unused energy in a machine?
Answer
(C)
It is converted to heat (usually)
36
In a thermal power plant, what is the role of the cooling towers?
Answer
(B)
To cool the water
37
What element is primarily involved in the process of 'burning'?
Answer
(B)
Oxygen
38
Which of the following has the least impact on the environment?
Answer
(A)
Nuclear energy
39
In a car engine, which energy transformation takes place?
Answer
(B)
Chemical to kinetic
40
What is the formula for calculating gravitational potential energy?
Answer
(B)
PE = m * g * h
41
In a power plant, what is primarily used to turn the turbines?
Answer
(A)
Steam
42
What energy is stored in batteries?
Answer
(B)
Chemical
43
What are the units used for the calculation of gravitational potential energy (PE = mgh)?
Answer
(A)
kg, m/s², m
44
Which of the following is primarily used to cool steam after it passes through the turbines in a thermal power plant?
Answer
(C)
Condenser
45
Which of the following sources has high safety standards?
Answer
(B)
Nuclear
46
What is the primary source of energy input for most thermal power stations?
Answer
(C)
Fossil fuels
47
What is the main reason for the growing interest in renewable energy sources?
Answer
(D)
To reduce greenhouse gas emissions
48
What are some of the problems with using shale gas?
Answer
A
C
49
What is the unit of work and energy?
Answer
(C)
Joule (J)
50
What does it mean to say 'work is done'?
Answer
(C)
Force has caused something to move.