1. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 1 Year 7 multiple-choice extension test 7J Electrical circuits For each question circle the correct answer.

2. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 2 Question 1 When the switch is closed this circuit becomes... A)a complete circuit B)an incomplete circuit C)a series circuit D)a short circuit

3. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 3 Question 2 When the switch is closed... A)both bulbs get dimmer B)both bulbs go out C)bulb 1 gets brighter and bulb 2 goes out D)bulb 1 goes out and bulb 2 gets brighter

4. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 4 Question 3 Three 1.5 V cells are connected as shown in the diagram. The total voltage is... A)0.5 V B)1.5 V C)3.0 V D)4.5 V

5. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 5 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)circuit 1 and circuit 2 only B)circuit 1 and circuit 3 only C)circuit 2 and circuit 3 only D)none of these circuits

6. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 6 Question 5 The currents through the ammeters A1 and A2 are... A)A1 = 1.0 A; A2 = 2.0 A B)A1 = 3.0 A; A2 = 1.0 A C)A1 = 3.0 A; A2 = 2.0 A D)A1 = 3.0 A; A2 = 3.0 A

7. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 7 Question 6 The currents through the ammeters A1 and A2 are... A)A1 = 0.5 A; A2 = 0.3 A B)A1 = 0.5 A; A2 = 0.8 A C)A1 = 1.0 A; A2 = 1.0 A D)A1 = 1.5 A; A2 = 0.3 A

8. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 8 Question 7 When current passes through a resistor... A)the current increases B)the current decreases C)the resistance falls D)the resistor heats up

9. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 9 Question 8 This circuit shows two bulbs and a variable resistor. When the resistance of the variable resistor is decreased... A)both bulbs get brighter B)both bulbs get dimmer C)bulb 1 gets brighter and bulb 2 gets dimmer D)bulb 1 gets dimmer and bulb 2 gets brighter

10. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 10 Question 9 A fuse works because... A)a large current melts a wire to break a circuit B)a large current melts a wire to complete a circuit C)a small current melts a wire to break a circuit D)a small current melts a wire to complete a circuit

11. © Cambridge University Press 2003, 2006, 2008 7J multiple-choice extension test 11 Question 10 A 13 amp fuse should be fitted into the plug of... A)a bedside lamp B)a computer monitor C)a kettle D)a radio