myUASARevision for UASA
More
My progress
Science questions, unit 7
Nama / NameKelas / ClassTarikh / Date

Energy

41 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

10 marks
Choose the best answer for each question.
1

Question 1

What is energy?
Show answerHide answer
A
Energy is the ability to do work.
For the teacher: Remembering, low difficulty, standard 7.1.1
Textbook p. 124
2

Question 2

Which is the main source of energy on Earth?
Show answerHide answer
D
The Sun is the main source of energy.
For the teacher: Remembering, low difficulty, standard 7.1.2
Textbook p. 124
3

Question 3

A guitar string is plucked and it vibrates. Which form of energy does it produce?
Show answerHide answer
B
Vibrating objects produce sound energy.
For the teacher: Understanding, low difficulty, standard 7.1.3
Textbook p. 126
4

Question 4

Which of these has potential energy?
Show answerHide answer
B
Objects that are stretched, compressed or high up have potential energy. A running boy has kinetic energy and rice has chemical energy.
For the teacher: Understanding, low difficulty, standard 7.1.3
Textbook p. 127
5

Question 5

Which energy transformation happens when you switch on a television?
Show answerHide answer
C
The television changes electrical energy into light energy (picture) and sound energy.
For the teacher: Applying, medium difficulty, standard 7.1.4
Textbook p. 128
6

Question 6

A solar calculator works without a battery. What is the first energy change in the calculator?
Show answerHide answer
B
The solar panel changes solar energy from the Sun into electrical energy.
For the teacher: Applying, medium difficulty, standard 7.1.4
Textbook p. 130
7

Question 7

A motorcycle stops when its petrol is finished. What happened to the energy?
Show answerHide answer
C
Energy cannot be created or destroyed. It is transformed into other forms.
For the teacher: Understanding, medium difficulty, standard 7.1.5
Textbook p. 133
8

Question 8

Which of these is a renewable energy source?
Show answerHide answer
D
Wind is always available. Coal and petroleum are fossil fuels and uranium is a nuclear substance. These three are non-renewable.
For the teacher: Remembering, low difficulty, standard 7.2.1
Textbook p. 134
9

Question 9

Why is petroleum a non-renewable energy source?
Show answerHide answer
A
Fossil fuels are limited and cannot be regenerated, so they will run out.
For the teacher: Analysing, high difficulty, standard 7.2.1
Textbook p. 134
10

Question 10

Which action does not use energy wisely?
Show answerHide answer
A
Lights in an empty room waste electrical energy. The other actions save energy or use a renewable source.
For the teacher: Evaluating, medium difficulty, standard 7.2.3
Textbook p. 137

Section B: structured questions

31 marks
Answer all questions. Circle the answer or write it in the space.
11

Question 11

Match each situation with its form of energy.
[1 mark] (a)Food in a lunch box
Show answerHide answer
Chemical energy
[1 mark] (b)A car moving along a road
Show answerHide answer
Kinetic energy
[1 mark] (c)A bell that is ringing
Show answerHide answer
Sound energy
For the teacher: Remembering, low difficulty, standard 7.1.3
Textbook p. 126
12

Question 12

A windmill turns when the wind blows.
[1 mark] (a)What does the turning windmill help to generate?
Show answerHide answer
Tick each point you got.
[1 mark] (b)Name one other energy source that turns a turbine to generate electricity.
Show answerHide answer
Tick each point you got.
For the teacher: Understanding, low difficulty, standard 7.1.2
Textbook p. 125
13

Question 13

A torch is switched on and its bulb lights up.
[1 mark] (a)What form of energy is stored in the battery?
Show answerHide answer
Tick each point you got.
[2 marks] (b)Write the energy transformation in the torch when it is switched on.
Show answerHide answer
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 7.1.4
Textbook p. 129
14

Question 14

Write the energy transformation for each situation.
[1 mark] (a)A boy rides a bicycle after eating his breakfast.
Show answerHide answer
Tick each point you got.
[1 mark] (b)A wood fire burns on a camping trip.
Show answerHide answer
Tick each point you got.
[1 mark] (c)A plant makes starch in sunlight (photosynthesis).
Show answerHide answer
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 7.1.4
Textbook p. 128
15

Question 15

A diver stands on a high diving board and then jumps into the pool.
[1 mark] (a)What form of energy does the diver have while standing on the board?
Show answerHide answer
Tick each point you got.
[1 mark] (b)What form of energy does the diver have while falling?
Show answerHide answer
Kinetic energy
[1 mark] (c)What form of energy is produced when the diver hits the water?
Show answerHide answer
Tick each point you got.
For the teacher: Understanding, low difficulty, standard 7.1.4
Textbook p. 129
16

Question 16

Diagram 1 shows what happens to a mobile phone that is being charged and then used.
Chain: electrical energy from the plug, then P in the phone battery, then light and sound energy
Diagram 1
[1 mark] (a)What form of energy is P?
Show answerHide answer
Tick each point you got.
[1 mark] (b)Why does the battery need to be charged again after some time?
Show answerHide answer
Tick each point you got.
[1 mark] (c)What can you conclude about energy from this situation?
Show answerHide answer
Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 7.1.5
Textbook p. 140
17

Question 17

Sort these energy sources into renewable and non-renewable: wind, coal, Sun, natural gas, biomass, uranium.
[3 marks] (a)Renewable energy sources (three)
Show answerHide answer
Tick each point you got.
[3 marks] (b)Non-renewable energy sources (three)
Show answerHide answer
Tick each point you got.
[1 mark] (c)Why can renewable energy sources be used again and again?
Show answerHide answer
Tick each point you got.
For the teacher: Understanding, low difficulty, standard 7.2.1
Textbook p. 134
18

Question 18

Diagram 2 shows the electricity bill of Ahmad's family for four months. In February the weather was very hot and the air conditioner was on all day. In April the weather was cooler.
Bar chart of electricity bills: January RM80, February RM95, March RM72, April RM60
Diagram 2
[1 mark] (a)Which month had the highest bill?
Show answerHide answer
Tick each point you got.
[1 mark] (b)How much less was the bill in April than in February?
Show answerHide answer
Tick each point you got.
[1 mark] (c)Give one reason why the bill went down in April.
Show answerHide answer
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 7.2.2
Textbook p. 136
19

Question 19

Cars and factories burn petroleum and natural gas. These energy sources are decreasing.
[2 marks] (a)Why is it important to use these energy sources wisely?
Show answerHide answer
Tick each point you got.
[2 marks] (b)Suggest two ways to use energy wisely in daily life.
Show answerHide answer
Any 2 points
Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 7.2.3
Textbook p. 137