Junior Secondary · Science

Energy sources : Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Energy sources .

10 questions24 marksFree, no account

Question 1

1 mark

Which of the following energy sources relies on the kinetic energy of moving air to generate electricity?

Question 2

1 mark

An electric motor is supplied with \(400\text{ J}\) of electrical energy. During its operation, it produces \(320\text{ J}\) of useful kinetic energy to lift a weight. What is the efficiency of this motor?

Question 3

1 mark

Consider the use of solar energy versus natural gas for electricity generation. Which statement accurately describes a key benefit of one and a key drawback of the other?

Question 4

1 mark

Biomass energy is an alternative energy source. Which of the following is a common source of biomass?

Question 5

1 mark

Which of the following actions best demonstrates a commitment to saving energy in daily life?

Question 6

2 marks

State one reason why coal and oil are classified as non-renewable energy sources according to the curriculum.

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Question 7

4 marks

A machine is designed with an energy conversion efficiency of \(75\%\). If the total electrical energy input to the machine is \(800\text{ J}\), calculate the amount of useful energy output produced.

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Question 8

5 marks

Explain why biomass energy is theoretically described as carbon neutral and identify one factor during its production lifecycle that could cause it to contribute to a net increase in greenhouse gases.

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Question 9

4 marks

Energy sources are classified into renewable and non-renewable categories.
(a)<\/b> Define the term 'renewable energy source'.
(b)<\/b> Name one example of a renewable energy source and one example of a non-renewable energy source.
(c)<\/b> Why is coal considered a non-renewable energy source even though it is formed from natural plant matter?<\/p>

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Question 10

4 marks

Solar energy is a popular alternative energy source in many countries.
(a)<\/b> Describe the primary energy conversion that takes place in a solar cell.
(b)<\/b> List one reason why solar energy is considered 'clean' compared to burning coal.
(c)<\/b> Explain one limitation of relying entirely on solar energy for a city's electricity supply.<\/p>

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