© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

1

Year 7 multiple-choicemain test: answers

7J Electrical circuits

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

2

Question 1

A switch turns off a torch by...

A) breaking the circuit

B) making the circuit

C) shorting the circuit

D) turning a series circuit into a parallel circuit

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

3

Question 2

In this circuit the bulb lights when...A) switch A only is closedB) switch B only is closedC) switch A and switch B are closedD) switch A and switch B are open

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

4

Question 3

The diagram shows...A) two batteries in parallelB) two batteries in seriesC) two cells in parallelD) two cells in series

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

5

Question 4

Electric current flows from...

A) the negative side of a battery around the circuit to the negative side

B) the negative side of a battery around the circuit to the positive side

C) the positive side of a battery around the circuit to the negative side

D) the positive side of a battery around the circuit to the positive side

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

6

Question 5

A cell can be used to produce an electric current. Inside a cell you would find...

A) chemicals

B) a motor

C) a pump

D) a variable resistor

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

7

Question 6

Electric current is measured...

A) using an ammeter and in units of amperes

B) using an ammeter and in units of volts

C) using a voltmeter and in units of amperes

D) using a voltmeter and in units of volts

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

8

Question 7

The circuit in which the ammeter is connected correctly is...A) circuit 1 onlyB) circuits 1 and 3 onlyC) circuits 2 and 3 onlyD) circuit 3 only

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

9

Question 8

The readings on ammeters X and Y will be...A) X = 0.10 A; Y = 0 AB) X = 0.15 A; Y = 0.10 AC) X = 0.20 A; Y = 0.20 AD) X = 0.25 A; Y = 0.30 A

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

10

Question 9

A bulb in a series circuit can be made dimmer by increasing...

A) the current in the circuit

B) the resistance of the circuit

C) the voltage of the battery

D) the voltage of the cell

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

11

Question 10

When three 1.5 V cells are connected as shown in this diagram, the total voltage is...A) 0.5 VB) 1.5 VC) 3.0 VD) 4.5 V

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

12

Question 11

The two circuits that have two bulbs connected in series are...A) 1 and 2 onlyB) 1 and 4 onlyC) 2 and 3 onlyD) 2 and 4 only

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

13

Question 12

Choose the position in the circuit A B C or D where the current will be 3.0 A.

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

14

Question 13

The current at X would be...A) 0.5 AB) 1.0 AC) 1.5 AD) 2.0 A

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

15

Question 14

The brightness of the bulbs in circuits 1 and 2 would be...A) circuit 1 = bright; circuit 2 = brightB) circuit 1 = bright; circuit 2 = dimC) circuit 1 = dim; circuit 2 = brightD) circuit 1 = dim; circuit 2 = dim

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

16

Question 15

Choose the statement that does not describea safety hazard when using electricity.

A) Plugging several appliances into the same socket.

B) Pulling a plug out by the lead.

C) Using mains appliances in the bathroom.

D) Using two kettles in the same kitchen.

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

17

Question 16

A fuse works by...

A) breaking the circuit if the current is too big

B) breaking the circuit if the resistance is too big

C) reducing the current flowing

D) reducing the resistance of the circuit

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

18

Question 17

Choose the position A B C or D in a plug where a fuse should be placed.

A) in the earth wire of a plug

B) in the live wire of a plug

C) in the neutral wire of a plug

D) none of these

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

19

Question 18

A device that could be used instead of a fuse to protect a circuit is...

A) an ammeter

B) a circuit breaker

C) a switch

D) a variable resistor

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

20

Question 19

Luigi Galvani discovered that frogs’ legs contain...

A) nerves that carry electrical pulses

B) nerves that carry water

C) wires that carry electrical pulses

D) wires that carry water

© Cambridge University Press 2003, 2006, 2008

7J multiple-choice main test: answers

21

Question 20

Alessandro Volta invented the first...

A) ammeter

B) bulb

C) battery

D) fuse