7J Electrical circuits
Multiple-choice extension test
For each question, circle the correct answer.
Question 1
When the switch is closed this circuit becomes...
A)
B)
C)
D)
a complete circuit
an incomplete circuit
a series circuit
a short circuit
Question 2
When the switch is closed...
A)
B)
C)
D)
both bulbs get dimmer
both bulbs go out
bulb 1 gets brighter and bulb 2 goes out
bulb 1 goes out and bulb 2 gets brighter
Cambridge Essentials Science © Cambridge University Press 2003, 2006, 2008
1
7J Electrical circuits
Multiple-choice extension test
Question 3
Three 1.5 V cells are connected as shown in the diagram. The total voltage is...
A)
B)
C)
D)
0.5 V
1.5 V
3.0 V
4.5 V
Question 4
The diagram shows three circuits made from identical cells and bulbs.
The two circuits in which the ammeters give the same readings are...
A)
B)
C)
D)
circuit 1 and circuit 2 only
circuit 1 and circuit 3 only
circuit 2 and circuit 3 only
none of these circuits
Cambridge Essentials Science © Cambridge University Press 2003, 2006, 2008
2
7J Electrical circuits
Multiple-choice extension test
Question 5
The currents through the ammeters A1 and A2 are...
A)
B)
C)
D)
A1 = 1.0 A; A2 = 2.0 A
A1 = 3.0 A; A2 = 1.0 A
A1 = 3.0 A; A2 = 2.0 A
A1 = 3.0 A; A2 = 3.0 A
Question 6
The currents through the ammeters A1 and A2 are...
A)
B)
C)
D)
A1 = 0.5 A; A2 = 0.3 A
A1 = 0.5 A; A2 = 0.8 A
A1 = 1.0 A; A2 = 1.0 A
A1 = 1.5 A; A2 = 0.3 A
Question 7
When current passes through a resistor...
A)
B)
C)
D)
the current increases
the current decreases
the resistance falls
the resistor heats up
Cambridge Essentials Science © Cambridge University Press 2003, 2006, 2008
3
7J Electrical circuits
Multiple-choice extension test
Question 8
This circuit shows two bulbs and a variable resistor.
When the resistance of the variable resistor is decreased...
A)
B)
C)
D)
both bulbs get brighter
both bulbs get dimmer
bulb 1 gets brighter and bulb 2 gets dimmer
bulb 1 gets dimmer and bulb 2 gets brighter
Question 9
A fuse works because...
A)
B)
C)
D)
a large current melts a wire to break a circuit
a large current melts a wire to complete a circuit
a small current melts a wire to break a circuit
a small current melts a wire to complete a circuit
Question 10
A 13 amp fuse should be fitted into the plug of...
A)
B)
C)
D)
a bedside lamp
a computer monitor
a kettle
a radio
Cambridge Essentials Science © Cambridge University Press 2003, 2006, 2008
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