Living Science (Second Edition) Unit Test 2 8 Making use of electricity
F2 Science Test
Unit 8 Making use of electricity
Name: Time and Marks
Class: Part A: 35 min / 100 marks
Date: Parts A & B: 45 min / 120 marks
Note:
1 Attempt ALL questions.
2 Write your answers in the spaces provided on the Answer Sheets.
A True or false questions (3 marks, 1 mark each)
Study each of the following statements. Write ‘T’ for a true statement and ‘F’ for a false statement on the answer
sheets.
1 Electric cells store electrical energy.
2 A bulb in a circuit will light up once it is connected to one end of a battery.
3 When the resistance of a circuit increases, the current flows around the circuit will become smaller.
B Multiple-choice questions (20 marks, 2 marks each)
Choose the correct answer for each of the following questions.
1 Which of the following circuits has the bulb lighted up when the circuit is closed?
A B C D
2 Which of the following is an electrical conductor?
A Rubber
B Wool thread
C Iron nail
D Wooden board
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
3 Which of the following copper wires has the smallest resistance?
A Short and thick
B Short and thin
C Long and thick
D Long and thin
4 Which of the following electric components has to be used in a dimmer switch or a volume controller?
A B C D
5 In general, the electrical components in a circuit have certain resistance. When an electric current flows
through them, part of the electrical energy is lost in the form of
A chemical energy.
B potential energy.
C heat energy.
D sound energy.
6 Which of the following about an electromagnet is correct?
(1) It works by making use of the heating effect of the current.
(2) It can be ‘turned off’ by cutting off the current.
(3) Its strength increases with the current flowing through it.
A (1) and (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
7 The following wires are made of the same material. Which of them has the greatest resistance?
8 When we say an electrical lamp consumes energy, what we actually mean is
A Electric charges are consumed in the lamp.
B The flow of electric charges is consumed into the lamp.
C Electric charges are converted into light energy and thermal energy in the lamp.
D Electrical energy is converted into light energy and thermal energy in the lamp.
9 Which of the following electrical appliances make use of the magnetic effect of a current?
(1) Electric iron
(2) Hair dryer
(3) Fire alarm
(4) Loudspeaker
A (1) and (3) only C (1), (2) and (3) only
B (3) and (4) only D (1), (2), (3) and (4)
10 Closing which two switches will make the buzzer sound?
A Switches X and Z C Switches X and Y
B Switches W and Z D Switches X and Z
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
C Fill in the blanks (24 marks, 2 marks each)
Complete the following sentences.
1 Current can only flow in a a circuit.
2 Copper allows electricity to flow through. Thus, it is a b ; Wood does not allow electricity to
flow through. Thus, it is an c .
3 An increase in the voltage in a circuit will d the electric current flowing through the circuit.
4 A e is an electric component having a certain resistance that can decide the size of current in a
circuit.
5 The unit of resistance is f and its symbol is g .
6 The resistance of a wire depends on the h that makes up the wire, its i and _ j .
7 The k of an appliance is the rate at which electrical energy is transferred to an appliance in a second.
8 A l can be produced by a magnet on a wire carrying an electric current.
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
D Questions (20 marks)
1 Figure A shows a simple circuit and figure B shows a water flow model.
water pump
water
water pipe
fan
A B
a In figure A, draw ‘ ’ and ‘ ’ to illustrate the directions of the flows of current and
electrons respectively. (4 marks)
b If we want to measure the current flowing through the circuit in figure A, what electric
component should be used? Draw a circuit diagram for the whole set-up. (6 marks)
c Compare figure A and figure B. State the features in figure B that represent the following
in figure A.
i Connecting wire (1 mark)
ii Light bulb (1 mark)
iii Electric current (1 mark)
iv Electron (1 mark)
v Battery (1 mark)
2 The figure below shows a circuit connected with a battery, connecting wires, a bulb, a switch and a rheostat.
- + - A
+
a Draw a circuit diagram for the above set-up. (5 marks)
b What is the major difference between a resistor and a rheostat? (3 marks)
c i What happens if we slide the contact of the rheostat from one side to another? (2 marks)
ii Explain your answer in c i. (4 marks)
d If we want to increase the brightness of the bulb in the circuit, should we slide the contact
of the rheostat towards A or B? (2 marks)
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
3 The diagram below shows a device X connected in a circuit.
a What is device X? (1 mark)
b (i) If the sliding contact of the rheostat is moved along the direction of the arrow in the
diagram, what will happen to the length of the resistance wire through which the current
flows? (1 mark)
(ii) What will happen to the brightness of the bulb in (i)? Explain your answer. (2 marks)
c Draw a circuit diagram for the above set-up. (5 marks)
End of paper
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
S2 Science Test
Unit 8 Making use of electricity
Answer Sheets
Name: Class: Marks:
Total: 100% (Part A) / 120% (Parts A & B)
Part A (Level 1) Section A
Total Do not
write in this
box
A True or false questions (3 marks, 1 mark each)
1 2 3
B Multiple-choice questions (20 marks, 2 marks each) Section B Total
Do not write in
this box
1 2 3 4 5
6 7 8 9 10
C Fill in the blanks (24 marks, 2 marks each)
a b c
Section C Total
d e f Do not write in
this box
g h i
j k l
D Questions (55 marks)
1 a b should be used.
c i ii iii iv v
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
2
a b
c i
ii
3 a
b (i)
(ii)
c
Section D Total
d Do not write in
this box
Part B (Level 2) (20 marks)
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
S2 Science Test (Unit 8 Making use of electricity)
Answers
Part A (Level 1)
A True or false questions (5%)
1F 2F 3T 1 m each
B Multiple-choice questions (20%)
1B 2C 3A 4D 5C 6C 7D 8C 9B 10 B 2 m each
C Fill in the blanks (20%)
a closed b conductor c insulator d increase e resistor
f ring circuit g voltage / electrical power h electrical power / voltage i electrical power j force 2 m each
D Questions (55%)
1 a
2 m each
b Ammeter should be used. 1m
battery: 1 m
connecting wire:1 m
A light bulb: 1 m
ammeter: 1 m
closed circuit:1 m
c i water pipe 1m
ii fan 1m
iii stream of flowing water 1m
iv water particles 1m
v water pump 1m
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Living Science (Second Edition) Unit Test 2 8 Making use of electricity
2 a
1 m for each electric component
b The resistance of a resistor is fixed whereas the resistance of a rheostat can be changed. 3m
c i The bulb becomes brighter or dimmer gradually. 2m
ii The resistance of the rheostat can be changed by moving the contact. Lower (Higher) resistance
allows larger (smaller) current to pass through and the bulb becomes brighter (dimmer). 4m
d Towards A. 2m
3 a Device X is a rheostat. 1m
b (i) The length of the resistance wire will decrease. 1 m each
(ii) The light bulb will be brighter. This is because the current is increased by the rheostat after decreasing
the length of the resistant wire. 2m
c 5m
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