Download Science Focus 2 TEST Chapter 7: Electricity Name: Class: ______

Science Focus 2 TEST
Chapter 7: Electricity
Name: _______________________
Class: __________
Instructions: Write answers in the right-hand column.
Date: _______
Score: ___________ / 58 marks
Section A  Multiple choice (15 marks)
1
2
3
4
5
A neutral object is one that contains:
A no charges.
B an equal number of positive and negative charges.
C only neutrons.
D an excess of one type of charge.
Which of the following will attract each other?
A Two positive charges.
B Two negative charges.
C A neutral charge and a positive charge.
D None of the above.
A large device used to demonstrate the effects of static electricity is the:
A Electrostatic precipitator.
B Vandenburg ioniser.
C Van de Graaff generator.
D Steffi Graf imitator.
A dangerous static charge may build up on an aircraft due to:
A charges in the atmosphere being attracted to the aircraft’s metallic body.
B chemical reactions involving aircraft exhaust gases.
C movement of air against the outside of the aircraft.
D electrical discharges from the instrument panel.
Lightning occurs when:
A charge flows between clouds.
B charge flows between a cloud and the ground.
C charge flows from one part of a cloud to another part of the same cloud.
D all of the above.
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
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Science Focus 2 TEST
Chapter 7: Electricity
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7
8
Lines representing electric fields are:
A always evenly spaced.
B always curved.
C closer together near charges.
D drawn with arrows showing the direction a negative charge would move if
free to do so.
Voltage is the:
A number of charges passing a point in a circuit every second.
B measure of the energy given to or lost by moving charges.
C number of charges in a cell.
D time taken for a charge to move around a circuit once.
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1
Which circuit below shows how to measure voltage and current for a single
globe in a circuit?
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9
10
Which of the following is a good conductor?
A Plastic.
B Copper.
C Water.
D Air.
In an electric circuit, resistance is:
A a connection terminal that is difficult to unscrew or tighten.
B something which does not allow any charge to flow.
C a component connected the wrong way around.
D something that restricts the flow of charge, transferring energy in the
process.
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
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Science Focus 2 TEST
Chapter 7: Electricity
11
12
A photovoltaic cell is a:
A solar cell.
B technical term for a light bulb.
C high voltage source.
D circuit symbol used to denote a voltage source such as a battery or cell.
1
The circuit below contains:
1
A
B
C
D
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3 globes in parallel.
3 globes in series.
1 globe in series with 2 globes in parallel.
2 globes in parallel with one globe in series.
When a globe is removed from the circuit below:
1
A
B
C
D
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the other two will continue to glow just as brightly as before.
the other two will glow more brightly than before.
the other two will glow less brightly than before.
all globes will go out.
Identify what the unit ‘ampere’ is used to measure.
A Current
B Voltage
C Resistance
D Electricity
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
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Science Focus 2 TEST
Chapter 7: Electricity
15
What would happen if all the power points in part of your home were wired
in series?
A The voltage would be too great and damage anything plugged into one of
them.
B If more than one power point was being used, the voltage would be too
small for devices to operate normally.
C They would work normally as long as used sensibly (i.e. not overloaded) 
power points are frequently wired in parallel with each other.
D All power points would have to be ‘on’ in order for any to work.
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Section B  Written answers (43 marks)
1
Explain the science behind a situation
in which a person experiences a static
electricity effect.
3
2
Predict where you think the word
‘photostat’ comes from.
2
3
An electric charge produces an electric
field. Explain what happens to the size
of an electric field when:
a you move closer to the charge.
b the size of the charge is
increased.
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
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Science Focus 2 TEST
Chapter 7: Electricity
4
Identify several electric field lines by
drawing them on the diagram below.
3
5
Explain why the metal foil strips at the
lower end of the electroscope below
repel each other, despite the rod not
touching the device.
2
6
Describe the direction of conventional
current in the conductor below.
2
7
Complete these sentences.
a ________ is a measure of the rate
at which charge flows, and is
measured in ________.
4
b ________ is a measure of the
energy given to or lost by
charges, and is measured in
________.
8
Identify the basic ‘ingredients’ in a cell
or battery.
2
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
Science Focus 2 TEST
Chapter 7: Electricity
9
a Define a conductor.
b Define an insulator.
c Identify two examples of a
conductor.
4
d Identify two examples of an
insulator.
10
Identify two examples of a resistance in
a circuit.
2
11
State the reading on each meter below.
Each meter is either a voltmeter or
ammeter and is connected correctly.
Assume globes in the same circuit are
identical.
a
10
b
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7
Science Focus 2 TEST
Chapter 7: Electricity
12
Consider the circuit below.
Identify which other globes would go
out if
4
a globe B blows.
b globe D blows.
c globe A blows.
d a copper wire is used to create a
short circuit from X to Y (assume
no globes blow).
13
Consider the party light circuit below.
3
a What would be the effect on the
other globes in the circuit if one
globe blew?
b How could the circuit be
redesigned so that if a globe
blows, none of the others do?
Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 1527 7