PHYSICS: ELECTRICITY F5

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Awesome physics with teacher Alina

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1. What is the unit of electric charge? *

5 points

Ampere, A

Kelvin, K

Coulomb, C

Volt, V

2. When a lightning strikes, a charge of 100 C flows in 0.5 s. Calculate the current that flows. *

5 points

5 A

10 A

20 A

200 A

3. Which of the following circuits can be used to determine the resistance of the bulb? *

5 points

4. Diagram1 shows a 6 Ω resistor connected to a cell of negligible internal resistance. Calculate the value of V. *

5 points

2 V

4 V

6 V

12 V

5. The resistance of a metallic wire increases when *

5 points

the thickness of the wire increases.

the temperature of the wire decreases.

the length of the wire increases.

the atmospheric pressure increases.

6. The graph in Diagram 2 shows the relationship between potential difference and electric current of an an ohmic conductor. What is the quantity represented by the gradient of the graph? *

5 points

resistance

electric power

electric energy

charge

7. Tungsten is chosen to be used as the filament of an electric bulb rather than copper. This is because *

5 points

tungsten is a better conductor of electricity.

the melting point of tungsten is higher.

tungsten is cheaper.

copper burns easily.

8. The kilowatt-hour (kWh) is a unit of measurement of *

5 points

Power

Time

Energy

electromotive force

9. What will happen if an air conditioner labelled “240V, 5 000W” is connected to a 240 V electrical supply using a three pin plug fitted with a 13 A fuse? *

5 points

The fuse melts

The air that comes out becomes hot.

The air conditioner functions normally.

Option 4The air that comes out becomes too cold.

10. A 2 Ω resistor and 4 Ω resistor are connected in series across a 24 V direct current supply. What is the current flowing through the circuit? *

5 points

2 A

4 A

6 A

12 A

11. An immersion heater is labelled “12V, 2A”. How much electrical energy is used when the heater is turned on for 10 minutes? *

5 points

10.5 kJ

12.2 kJ

14.4 kJ

36.0 kJ

12. All bulbs in the circuits below are identical. Which circuit has the smallest effective resistance. *

5 points

13. Which of the following quantities can be measured in units of joule/columb? *

5 points

Power

Resistance

Potential difference

Electric current

14. An air conditioner rated “240V, 1500W” is being used for 6 hours. If the tariff is RM0.25 per unit, what is the cost of using the air conditioner? *

5 points

RM 1.125

RM 1.80

RM 2.25

RM 4.25

15. A torchlight bulb uses a 4.5 V supply and the current flowing through it is 0.2 A. How much electrical energy is used if the torchlight is turned on for 1 minute? *

5 points

28 J

45 J

54 J

60 J

16. In the transmission of electricity through cable, the energy loss is directly proportional to *

5 points

the radius of the cable

the resistance of the cable

the current flowing in the cable

17. The circuit below shows four identical bulbs connected to a cell 6V. Which bulb labelled A, B, C and D is the brightest?

5 points

bulb A

bulb B

bulb C

bulb D

Clear selection

18. Diagram 3 shows an electrical circuit. If the readings of ammeters A1 and A2 are 2 A and 1 A respectively, what is the reading of ammeter A3? *

5 points

1 A

2 A

3 A

5 A

19. Diagram 4 shows a dry cell with an electromotive force (e.m.f.) of 1.5 V. What is the possible reading of the voltmeter V when the switch is closed? *

5 points