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Physics for IGCSE & O level - Forces And Energy (Section 5)

1
If a machine has an efficiency of 80%, what does this mean?
Answer
(A)
80% of the energy input is converted to useful energy
2
Which of the following is an example of energy storage?
Answer
(B)
A stretched spring
3
What does PE stand for?
Answer
(A)
Potential energy
4
In a thermal power station, which component uses the energy from steam?
Answer
(B)
Turbine
5
What are the benefits of using renewable sources of energy?
Answer
A
D
6
What is the main function of the dam in a hydroelectric power plant?
Answer
(B)
To store water
7
Which energy resources can cause global warming?
Answer
(A)
Fossil Fuels
8
How can you convert energy?
Answer
(A)
You can transform it from one type to another
9
What is the formula for calculating work done?
Answer
(B)
Work = Force * Distance
10
If the work done is 20J and the distance moved is 4m, what is the force applied?
Answer
(A)
5 N
11
In the context of physics, what does work done represent?
Answer
(C)
Energy transferred when a force causes displacement
12
What is the role of the fuel in a car engine?
Answer
(B)
To provide the energy
13
Which energy sources are considered non-renewable?
Answer
A
B
C
14
What is a challenge in extracting shale gas?
Answer
(B)
High pressure water is required
15
Which form of energy is stored in an object due to its height?
Answer
(B)
Gravitational potential energy
16
Which of the following is an example of thermal energy?
Answer
(B)
A hot cup of coffee
17
In the equation for gravitational potential energy (PE = mgh), what does 'g' represent?
Answer
(D)
Gravitational acceleration
18
What are examples of renewable sources?
Answer
A
B
19
What is one major problem with using coal as a fuel?
Answer
(C)
It releases sulfur dioxide
20
What is the definition of power?
Answer
(B)
Rate of doing work or transferring energy.
21
What are some forms of fossil fuels?
Answer
A
B
D
22
What process in the sun turns hydrogen to helium?
Answer
(B)
Nuclear fusion
23
What does the word "harness" mean in the context of energy?
Answer
(C)
To control and use it
24
Which of the following is true about energy in a simple chain?
Answer
A
B
C
25
What do engines and motors transfer energy from?
Answer
A
B
26
What is a potential environmental problem associated with hydroelectric power schemes?
Answer
(B)
Flooding land
27
What type of waste is generated by a nuclear power station?
Answer
(B)
Radioactive waste
28
Which of the following is a potential problem associated with geothermal energy?
Answer
(C)
Difficult drilling
29
Which is a main source for biofuels?
Answer
(C)
Plants
30
What is the primary environmental concern related to the use of coal for energy?
Answer
(C)
Air pollution
31
What is a major problem associated with burning fossil fuels?
Answer
(B)
The greenhouse effect
32
What is the source of energy used for tidal power?
Answer
(C)
Tides
33
What happens to the energy in a hydroelectric power station?
Answer
(C)
The energy is converted.
34
What type of energy is released during the falling of an apple?
Answer
(A)
Kinetic energy
35
What type of scheme generates hydroelectric power?
Answer
(C)
Dams
36
What is one of the main disadvantages of nuclear power stations?
Answer
(C)
They generate radioactive waste
37
What type of energy is used for the rotating of turbines in a power station?
Answer
(D)
Thermal Energy
38
Which of these is a source of renewable energy?
Answer
(C)
Tidal
39
How can you increase the kinetic energy of an object?
Answer
(B)
Increase its mass or speed.
40
What is the main disadvantage of pumped storage schemes?
Answer
(D)
They are expensive to build.
41
What is the name of the process where the nuclei of atoms are split to release energy?
Answer
(B)
Fission
42
How is power calculated?
Answer
(A)
Power = Work / Time
43
What units is the change in energy measured in?
Answer
(C)
J
44
If you lift an object, how do you increase its potential energy?
Answer
(A)
By increasing its mass.
45
In energy transfers, what is the term for the energy being transferred?
Answer
(C)
Energy transfer
46
What is the term for the energy stored in a compressed spring?
Answer
(B)
Elastic energy
47
What are the main environmental drawbacks of burning fossil fuels?
Answer
A
C
48
What type of energy is associated with harnessing the tides?
Answer
(C)
Tidal energy
49
In the formula for PE, what does 'h' represent?
Answer
(B)
Height
50
Which of the following is a renewable energy source?
Answer
(C)
Wind