Science
Assessment # 4 (Power Stations)
Class 7
Name:______________
marks:_________/15
Section:___________
date:_____________
Q1. Choose the best option.
I.
Which of these types of power station uses gravitational potential energy to
generate electricity?
A
wind farm
B
geothermal power station
C
hydroelectric power station
D
coal-fired power station
II.
Which of these types of power station transfers thermal energy to generate
electricity?
A
coal-fired power station
B
solar farm
C
hydroelectric power station
D
wind farm
III.
A
(3)
What is the useful energy transfer in a wind turbine?
chemical to kinetic
B
electrical to kinetic
C
kinetic to chemical
D
kinetic to electrical
Q2. Some energy sources are renewable and other energy sources are non-renewable.
(i) Explain what is meant by the term non-renewable.
(1)
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(ii) Give an example of a non-renewable energy source.
(1)
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(iii) What are the disadvantages of using non-renewable energy resources?
(3)
__________________________________________________________________________
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Q3. The diagram shows stages in electricity generation at a nuclear power station.
a) Label the part A
(1)
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b) Label the part B
(1)
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c) What is the role of generator in a power station?
(2)
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Q4. Give one advantage of using wind turbines instead of a coal-fired power station to
produce electricity.
(1)
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Q5. ) Coal-fired power stations are still in general use at many places.
Explain why wind turbines have not replaced them.
(2)
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