Electricity Quiz

Image Source

Quiz Questions

1.
1. What is the frequency of the mains electricity supply in the UK?
- A.
  40Hz
- B.
  50Hz
- C.
  60Hz
- D.
  70Hz
2.
2. Give an advantage of using a RCCB to switch off a circuit rather than a fuse.
- A.
  Fast acting and can be reset
- B.
  Slower acting but can be reset
- C.
  Fast acting but cannot be reset
- D.
  Cheaper
3.
3. How does an increase in temperature affect a thermistor?
- A.
  Increase in temperature decreases the current
- B.
  Increase in temperature increases resistance of thermistor
- C.
  Decrease in temperature increases the current
- D.
  Increase in temperature decreases resistance of thermistor
4.
4. What is the difference between ac (alternating current) and dc (direct current)?
- A.
  ac flows in one direction, dc changes direction twice per cycle
- B.
  dc is much more powerful than ac
- C.
  ac is much more powerful than dc
- D.
  dc flows in one direction, ac changes direction twice per cycle
5.
5. How does a fuse and earth wire protect against an electric shock, in a faulty metal kettle, where the metal casing becomes live?
- A.
  A current flows through the fuse to the earth wire safely discharging it.
- B.
  A current flows from the live wire to the earth wire and this current causes the fuse to melt
- C.
  A high voltage will cause the fuse to melt and excess charge flows through the earth wire.
- D.
  A low current but high voltage makes the fuse break and flow through the earth.
6.
6. Define electric current
- A.
  Flow of charge
- B.
  Push given by the cells
- C.
  Pure energy
- D.
  Charge per second
7.
7. Define potential difference
- A.
  The flow of electrons in a circuit
- B.
  The force of electrons in a circuit
- C.
  Energy transferred per coulomb of charge
- D.
  The power of the charge per second
8.
8. Explain why it is a good idea for electricians to wear boots with rubber soles.
- A.
  Rubber is a good insulator and it increases the overall resistance so gives a smaller shock
- B.
  Rubber is a good shock absorber which allows the current to flow through it.
- C.
  Rubber has excellent grip which allows them to keep not to slip in the wet
- D.
  Rubber is a good conductor but only towards earth hence stopping electrical shocks
9.
9. Define double insulated.
- A.
  The case of the plug is made of extra thick plastic which is an excellent insulator and stops electric shocks.
- B.
  The case of an appliance is made of plastic and there is no connection between the inner and outer insulated parts of the appliance.
- C.
  The case of the plug and the wires inside are insulated
- D.
  The wires have to layers of plastic insulation to reduce the risk of shocks.
10.
10. What is the mains p.d. in the UK?
- A.
  220V
- B.
  230V
- C.
  240V
- D.
  250V
11.
11. What are the colours of the live, earth and neutral wire inside a 3 pin plug?
- A.
  Live is yellow, earth is green and blue and neutral is brown
- B.
  Live is red, earth is brown and green and neutral is yellow
- C.
  Live is brown, earth is blue and green and neutral is yellow
- D.
  Live is brown, earth is yellow and green and neutral is blue
12.
12. How does the resistance of an LDR change with light intensity?
- A.
  The lower the light intensity the lower the resistance
- B.
  The higher the light intensity the lower the voltage
- C.
  The higher the light intensity the lower the resistance
- D.
  The lower the light intensity the lower the voltage
13.
13. Which one is a current-voltage graph for a diode?
- A.
  Image Source
  Answer A
- B.
  Image Source
  Answer B
- C.
  Image Source
  Answer C
14.
14. Which one is a current-voltage graph for a filament lamp?
- A.
  Image Source
  Answer A
- B.
  Image Source
  Answer B
- C.
  Image Source
  Answer C
15.
15. Which one is a current-voltage graph for a metal wire?
- A.
  Image Source
  Answer A
- B.
  Image Source
  Answer B
- C.
  Image Source
  Answer C

Quiz Outcomes

1.
Result 1