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- 1. Multiple Choice
Which of the following is the unit for current?
Volt (V)
Watt (W)
Ampere (A)
Ohm (Ω)
- 2. Multiple Choice
Which of the following is the unit for potential difference?
Volt (V)
Watt (W)
Ampere (A)
Ohm (Ω)
- 3. Multiple Choice
Which of the following is the electric charge that flows around in a circuit?
Protons
Neutrons
Ions
Electrons
- 4. Multiple Choice
A voltmeter can be used to measure ....
potential difference
resistance
electrical energy
current
- 5. Multiple Choice
Which of the following is an insulator?
Aluminium plate
Rubber eraser
Copper wire
Iron nail
- 6. Multiple Choice
Cells produce electrical energy by converting it from ....
heat energy
kinetic energy
light energy
chemical energy
- 7. Multiple Choice
In the water pipe model of current and potential difference, what does the water pump represent?
battery
bulb
current
wire
- 8. Multiple Choice
The magnitude of the current is measured with a device called ..
ammeter
voltmeter
dynamometer
thermometer
- 9. Multiple Choice
If the battery produced 12.6 Volts and what would the current flow be for a 6 Ohm resistor?
2.1 A
3.1 A
1.5 A
0.3 A
- 10. Multiple Choice
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
48 V
28 V
2.5 V
0.75 V
- 11. Multiple Choice
What size resistor would produce a current flow of 5 Amps with a battery voltage of 12.6 volts
2.52 ohm
1.89 ohm
0.39 ohm
2.25 ohm
- 12. Multiple Choice
Which of the following statements is Kirchoff's first law?
the sum of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction
the sum of the charges entering any junction in an electric circuit must equal the sum of the charges leaving that junction
the sum of the emfs entering any junction in an electric circuit must equal the sum of the pds leaving that junction
none of these
- 13. Multiple Choice
A diode is...
a device that allows the flow of electric current in one direction only
a device that prevents damage to other components in a circuit
can produce simple sounds when there is a current in it
can produce light when there is a current in it
- 14. Multiple Choice
A thermistor is a digital sensor that can measure ......
pressure
humidity
pH level
temperature
- 15. Multiple Choice
A smartphone is being charge by 110 V of mains electricity with current of 2 A for 30 minutes.
792 KJ
3 KJ
396 KJ
198 KJ
- 16. Multiple Choice
The value of electrical power depends on ..
I. current
II. potential difference
III. time
IV. the source of electrical power
I and III
I, II and III
III and IV
all of the above
- 17. Multiple Choice
A solar cell produces electrical energy by converting it from .... energy
mechanical
chemical
light
sound
- 18. Multiple Choice
Which of the elements is not fossil fuel?
coal
biomass
petroleum
diesel
- 19. Multiple Choice
I. solar power
II. petroleum
III. Diesel
IV. Coal
V. Wind power
Which of the above is renewable energy?
I, II and III
I and V
II, III, and IV
all of them
- 20. Multiple Choice
Which of the following is non-renewable energy?
I. Hydroelectricity
II. Tidal power
III. Geothermal energy
IV. Bioenergy
V. Natural gas
I and II
none
all of them
I, III and IV
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