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IS_Section Quiz_8.5_e — Worksheet Questions (Grade 13)

Total questions: 77

Worksheet time: 39mins

Name
Class
Date
1.

All metals conduct electricity equally well.

a)

True

b)

False

2.

The resistance of an insulator is larger than that of a conductor.

a)

False

b)

True

3.

When the resistance of a circuit is higher, the voltage is smaller.

a)

True

b)

False

4.

A thinner wire has a higher resistance.

a)

False

b)

True

5.

The resistance of a resistor cannot be adjusted.

a)

False

b)

True

6.

A nichrome wire always conducts electricity poorer than a copper wire.

a)

False

b)

True

7.

The resistance of an insulator is zero.

a)

True

b)

False

8.

Resistance has no effect on the voltage of a circuit.

a)

False

b)

True

9.

A longer wire has a higher resistance.

a)

True

b)

False

10.

A hi-fi volume control is an application of resistors.

a)

True

b)

False

11.

Which of the following statements about resistance is/are correct? (1) The resistance of a material measures the opposition of the material to the flow of electric current. (2) Good conductors have zero resistance. (3) A resistor has a larger resistance than a rheostat.

a)

(1) and (2) only

b)

(3) only

c)

(2) and (3) only

d)

(1) only

12.

The resistance of a wire decreases when (1) its thickness increases. (2) its length increases. (3) the voltage in the circuit decreases.

a)

(1) and (2) only

b)

(1) only

c)

(3) only

d)

(2) and (3) only

13.

Which of the following copper rods has the lowest resistance?

a)

A copper rod of length 5 cm and thickness 5 mm

b)

A copper rod of length 10 cm and thickness 5 mm

c)

A copper rod of length 10 cm and thickness 10 mm

d)

A copper rod of length 5 cm and thickness 10 mm

14.

Which of the following methods can increase the brightness of the bulb in the circuit below? (1) Move the sliding contact towards P. (2) Move the sliding contact towards Q. (3) Add more electric cells to the circuit.

a)

(2) only

b)

(3) only

c)

(1) and (3) only

d)

(1) and (2) only

15.

Which of the following methods can increase the brightness of the bulb in the circuit below? (1) Reduce the distance between clips P and Q. (2) Relocate the number of electric cells in the circuit. (3) Replace the nichrome wire with a thicker one.

a)

(1) and (2) only

b)

(1), (2) and (3)

c)

(2) and (3) only

d)

(1) and (3) only

16.

Which of the following statements about the device below is correct?

a)

It can be used in the dimmer switch for a lamp.

b)

Its resistance cannot be changed.

c)

It is a sliding rheostat.

d)

It can be used to measure resistance.

17.

The diagram is an analogy to show the effect of length on the resistance of a wire. What do the obstacles in the analogy represent?

a)

Free electrons

b)

Resistance

c)

Current

d)

Voltage

18.

The diagram is an analogy to show the effect of length on the resistance of a wire. Which of the following correctly explains the effect of length on the resistance of a wire using the analogy?

a)

If the road is longer, fewer lorries can travel through the road in a given time.

b)

If the road is longer, there are more obstacles on the road, and thus the ‘resistance’ to the lorries is higher.

c)

If the road is longer, more lorries can travel through the road in a given time.

d)

If the road is longer, there are more obstacles on the road, and thus the ‘resistance’ to the lorries is lower.

19.

Which of the following will affect the resistance of a wire? (1) Thickness of the wire (2) Material of the wire (3) Voltage across the wire

a)

(1), (2) and (3)

b)

(1) and (2) only

c)

(1) and (3) only

d)

(2) and (3) only

20.

Which of the following methods can increase the brightness of the bulb in the circuit below?

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

21.

When light bulbs are connected in series, they are connected one after the other on the same single path.

a)

True

b)

False

22.

The current is the same at every point in a series circuit.

a)

True

b)

False

23.

The current is the same at every point in a parallel circuit.

a)

True

b)

False

24.

If a gap appears in a series circuit, no current can flow in the circuit.

a)

True

b)

False

25.

If a gap appears in a branch of a parallel circuit, no current can flow in the other branch.

a)

True

b)

False

26.

The voltage is the same at all points in a series circuit.

a)

True

b)

False

27.

The brightness of different light bulbs must be the same in a series circuit.

a)

False

b)

True

28.

The voltage across each branch of a parallel circuit is the same.

a)

True

b)

False

29.

The current flowing through each branch of a parallel circuit is the same.

a)

False

b)

True

30.

In a parallel circuit, the voltage of the electric cells is equal to the sum of the voltages in the branches.

a)

False

b)

True

31.

Which of the following statements about a parallel circuit is correct?

a)

The current in the main loop is equal to the current in each branch.

b)

A larger current flows in the branch with a larger resistance.

c)

The voltage is different across each branch.

d)

The voltage across each branch is equal to the voltage across the electric cells.

32.

Which of the following circuits can turn the light bulbs on or off at the same time? The three small diagrams labeled (1), (2), and (3) show different switch placements controlling two bulbs.

a)

(2) only

b)

(2) and (3) only

c)

(1) only

d)

(1) and (3) only

33.

In the circuit, if the current flowing through light bulb P is 1 A, what are the currents flowing through light bulbs Q and R respectively?

a)

Q: 2 A; R: 2 A

b)

Q: 1 A; R: 1 A

c)

Q: 1 A; R: 2 A

d)

Q: 2 A; R: 1 A

34.

The three light bulbs in the circuit are the same. If switch P is closed, the ammeter reading is 1 A. What will the ammeter reading be if all switches are closed?

a)

2 A

b)

3 A

c)

0 A

d)

1 A

35.

The three light bulbs in the circuit are the same. If switch P is closed, the ammeter reading is 1 A. If all switches are closed and one of the light bulbs is broken, what will the ammeter reading be?

a)

2 A

b)

1 A

c)

3 A

d)

0 A

36.

If the current flowing through resistor P is 1 A, what is the current flowing through resistor Q?

a)

1 A

b)

It cannot be determined.

c)

0 A

d)

2 A

37.

If resistor Q is removed, what will the current flowing through resistor R be?

a)

1 A

b)

2 A

c)

It cannot be determined.

d)

0 A

38.

Three identical light bulbs P, Q and R are connected in a circuit. The voltage of the electric cells is 3 V. What is the voltage across light bulb P?

a)

1.5 V

b)

It cannot be determined.

c)

4.5 V

d)

3 V

39.

Three identical light bulbs P, Q and R are connected in a circuit. The voltage of the electric cells is 3 V. If light bulb Q is broken, what will the voltages across light bulbs P and R be?

a)

Light bulb P: 1.5 V; Light bulb R: 0 V

b)

Light bulb P: 3 V; Light bulb R: 0 V

c)

Light bulb P: 1.5 V; Light bulb R: 1.5 V

d)

Light bulb P: 3 V; Light bulb R: 3 V

40.

Which of the following statements about the circuit shown is correct? The diagram shows three light bulbs labeled P, Q and R connected by wires to a power supply; P is at the top left, R at the bottom left, and Q is on a diagonal branch leading to the power supply.

a)

Light bulbs P and Q are connected in parallel.

b)

Light bulbs P and Q are connected in series.

c)

Light bulbs P, Q and R are connected in parallel.

d)

Light bulbs P, Q and R are connected in series.

41.

The mains voltage in Hong Kong is 110 V110\,\mathrm{V} .

a)

False

b)

True

42.

The pins of a three-pin plug are connected to the live wire, neutral wire and earth wire respectively.

a)

True

b)

False

43.

Domestic circuits are connected in series.

a)

False

b)

True

44.

Connecting too many electrical appliances to a mains socket may result in short circuit.

a)

True

b)

False

45.

The earth wire is used to protect us from getting an electric shock.

a)

True

b)

False

46.

The mains voltages in different countries are the same.

a)

False

b)

True

47.

Electric kettles work on the magnetic effect of electric current.

a)

False

b)

True

48.

Electric motors convert kinetic energy into electrical energy.

a)

False

b)

True

49.

Fuse rating shows the maximum current that can flow through the fuse.

a)

True

b)

False

50.

Overloading can cause a dangerously large voltage in a circuit.

a)

False

b)

True

51.

Which of the following statements about a live wire is correct?

a)

A live wire protects us from getting an electric shock.

b)

A live wire carries the voltage that drives the current flowing through the appliance.

c)

The colour of a live wire is green.

d)

A live wire provides a return path for the electric current.

52.

When an electrical appliance is in normal operation, which pins will electric current flow through? The diagram shows a wall socket and a plug with pins labeled X, Y and Z.

a)

Pins X and Z

b)

Pins Y and Z

c)

Pins X and Y

d)

Pins X, Y and Z

53.

Which of the following electrical appliances make use of the heating effect of electric current? (1) Hairdryer (2) Electric toothbrush (3) Rice cooker

a)

(2) and (3) only

b)

(1) and (3) only

c)

(1) and (2) only

d)

(1), (2) and (3)

54.

Which of the following electrical appliances makes use of the magnetic effect of electric current?

a)

Electric kettle

b)

Fan

c)

Light bulb

d)

Toaster

55.

Which of the following statements about a fuse is INCORRECT?

a)

Fuse rating shows the maximum current that can flow through the fuse without burning it.

b)

The metal wire of a fuse melts when the current is larger than the fuse rating.

c)

The fuse used in an appliance should have a fuse rating slightly lower than the current drawn by the appliance during normal operation.

d)

After a fuse burns out, it cannot be used again.

56.

Which of the following wires provide(s) a return path for the current? The diagram shows the interior of a three-pin plug with wires labeled P, Q and R connected to their respective terminals.

a)

Wires P and R only

b)

Wire P only

c)

Wire Q only

d)

Wires Q and R only

57.

In the diagram, an appliance has a fault which causes the live wire to touch the metal casing. We would not get an electric shock if we touch the metal casing, because

a)

the current will flow through the earth wire to the ground instead of through our body.

b)

the current will flow through the metal casing to the ground instead of through our body.

c)

the current will flow through the earth wire to the neutral wire instead of through our body.

d)

the current will flow through the metal casing to the neutral wire instead of through our body.

58.

Under normal operation, the current flowing through a rice cooker is 10 A10\,\mathrm{A} . Which of the following fuses should we choose to protect the rice cooker? The diagram shows four cartridge fuses labeled A, B, C and D with visible current ratings.

a)

A

b)

C

c)

D

d)

B

59.

Which of the following electrical appliances make use of the magnetic effect of electric current? (1) Electric door lock (2) Loudspeaker (3) Washing machine

a)

Electric door lock

b)

Loudspeaker

c)

Washing machine

d)

None of these

60.

Which of the following is/are safety precautions when using electricity? (1) Install a fuse with fuse rating slightly lower than the current in the circuit under normal operation. (2) Leave enough space around electrical appliances to prevent overheating. (3) Repair damaged electrical appliances by ourselves.

a)

(1) only

b)

(1) and (3) only

c)

(2) and (3) only

d)

(2) only

61.

A1. All non-metals are electrical insulators.

a)

True

b)

False

62.

A2. In a series circuit, the current is the same at every point.

a)

True

b)

False

63.

A3. A fuse is used to prevent a dangerously large current flowing through a circuit.

a)

False

b)

True

64.

[E] A4. To produce light of certain brightness, a light bulb of a higher efficiency requires a smaller power input to work.

a)

False

b)

True

65.

Rods made of different materials are connected between points P and Q in the circuit diagram with a battery and a light bulb. Which rod would cause the bulb to light?

a)

Plastic rod

b)

Glass rod

c)

Wood rod

d)

Copper rod

66.

B2. Which of the following statements about the current in a closed circuit is correct?

a)

Nuclei flow from the positive pole of the electric cell towards the negative pole.

b)

Free electrons flow from the positive pole of the electric cell towards the negative pole.

c)

Nuclei flow from the negative pole of the electric cell towards the positive pole.

d)

Free electrons flow from the negative pole of the electric cell towards the positive pole.

67.

The photo shows an ammeter connected in series with a light bulb. B3. Answer the following question.

a)

the current through the bulb is 0.3 A

b)

the voltage across the bulb is 1.5 A

c)

the voltage across the bulb is 0.3 A

d)

the current through the bulb is 1.5 A

68.

B4. Which of the following statements about an electromagnet are correct? (1) It works by making use of the heating effect of 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 (3) only

b)

(2) and (3) only

c)

(1) and (2) only

d)

(1), (2) and (3)

69.

The diagram shows an iron nail with an insulated wire coiled around it. The wire is connected to a dry cell. B5. Answer the following question.

a)

Nothing will happen to the nail.

b)

The nail will melt.

c)

The nail will become a magnet.

d)

Electric current will flow through the nail.

70.

[E] B6. Which of the following nichrome rods has the highest resistance?

a)

A nichrome rod of length 20 cm and thickness 3 mm

b)

A nichrome rod of length 20 cm and thickness 5 mm

c)

A nichrome rod of length 10 cm and thickness 5 mm

d)

A nichrome rod of length 10 cm and thickness 3 mm

71.

Three identical light bulbs are connected to a battery as shown in the diagram. The arrow indicates the direction of the current flow. B8. Answer the following question.

a)

The current in Bulb 1 is greater than the current in Bulb 3.

b)

The current in Bulb 2 is the same as the current in Bulb 1.

c)

The current in Bulb 2 is the same as the current in Bulb 3.

d)

The current in Bulb 1 is greater than the current in Bulb 2.

72.

B9. Which of the following statements about an earth wire is correct?

a)

The colour of an earth wire is brown.

b)

An earth wire carries the mains voltage.

c)

An electrical appliance without an earth wire cannot function normally.

d)

An earth wire is used to protect us from getting an electric shock.

73.

In the circuit diagram, the current through each light bulb in normal operation is 0.5 A. Which of the following is the most suitable rating of the fuse in the circuit? B10. Answer the following question.

a)

2 A

b)

0.5 A

c)

1 A

d)

3 A

74.

Study the circuit below. Light bulbs X, Y and Z are identical. C2(a) Answer the following question.

a)

B. bulb X: 0.8 A; bulb Z: 0.4 A

b)

D. bulb X: 1.2 A; bulb Z: 0 A

c)

A. bulb X: 0.4 A; bulb Z: 0.8 A

d)

C. bulb X: 0.6 A; bulb Z: 0.6 A

75.

Study the circuit below. Light bulbs X, Y and Z are identical. C2(b) Answer the following question.

a)

D. The current would remain unchanged.

b)

C. The current would become zero.

c)

B. The current would become very small.

d)

A. The current would become very large.

76.

C3(a) What is the mains voltage of Hong Kong?

a)

B. 200 V

b)

D. 250 V

c)

C. 220 V

d)

A. 110 V

77.

A 1500 W microwave oven works on the mains voltage of Hong Kong. [E] C3(b) The microwave oven is turned on for 15 minutes. What is the electrical energy used?

a)

C. 13 500 J

b)

A. 1350 J

c)

B. 1500 J

d)

D. 1 350 000 J