G11 T3 Classwork 5 And 6

20 Questions | Total Attempts: 194

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G11 T3 Classwork 5 And 6

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Questions and Answers
  • 1. 
    Two faulty ammeters and two perfect ammeters are connected in series in the circuit shown.The readings on the ammeters are:A1 2.9 AA2 3.1 AA3 3.1 AA4 3.3 AWhich two ammeters are faulty?
    • A. 

      A1 and A2

    • B. 

      A1 and A4

    • C. 

      A2 and A3

    • D. 

      A3 and A4

  • 2. 
    The circuit shown contains four lamps and three switchesWhich switches must be closed to light only lamps 1 and 3? 
    • A. 

      Switch 1 only

    • B. 

      Switch 1 and switch 2 only

    • C. 

      Switch 1 and switch 3 only

    • D. 

      Switch 2 and switch 3 only

  • 3. 
    In which circuit does the voltmeter read the potential difference across the lamp?
  • 4. 
    In the circuit below, X and Y are identical 6 V lamps.What happens when the switch is closed?
    • A. 

      X lights more brightly than Y.

    • B. 

      Y lights more brightly than X.

    • C. 

      X and Y light with equal brightness.

    • D. 

      Neither X nor Y light.

  • 5. 
    Four lamps and four switches are connected to a power supply as shown in the circuit diagram.When all the switches are closed, all the lamps are lit.When one of the switches is then opened, only one lamp goes out.Which switch is opened?
  • 6. 
    A lamp is to be connected in a circuit so that the p.d. across it can be varied from 0 to 6 V.Which circuit would be most suitable?
  • 7. 
    We want to have two 6V lamps in the circuit with the 6 V supply.Which of the following means of connecting the lamps between X and Y is the best?
    • A. 

      1, because they are in series, shine brighter and can be controlled independently.

    • B. 

      1, because they are in parallel and shine brighter and can be controlled independently.

    • C. 

      2, because they are in series and shine brighter and can be controlled independently.

    • D. 

      2, because they are in parallel and shine brighter and can be controlled independently.

  • 8. 
    Which circuit is a variable potential divider (potentiometer)?
  • 9. 
    The circuit contains a relay.When switch S is closed, what is the state of the lamps?
    • A. 

      Lamp 1 ON, lamp 2 ON

    • B. 

      Lamp 1 ON, lamp 2 OFF

    • C. 

      Lamp 1 OFF, lamp 2 ON

    • D. 

      Lamp 1 OFF, lamp 2 OFF

  • 10. 
    A student makes the circuit shown.The fuse has blown and stopped the current.What could have caused this?
    • A. 

      The current rating of the fuse was too high.

    • B. 

      The current was too large.

    • C. 

      The lamp was loose.

    • D. 

      The voltage was too small.

  • 11. 
    Why is a fuse used in an electrical circuit in a house? 
    • A. 

      To increase the circuit resistance

    • B. 

      To keep the power used to a minimum value

    • C. 

      To prevent a short-circuit from occurring

    • D. 

      To stop the cables from carrying too much current

  • 12. 
    An electric power tool is being used outdoors in a shower of rain.What is the greatest hazard to the user?
    • A. 

      The cable gets hot and causes burns.

    • B. 

      The circuit-breaker cuts off the current.

    • C. 

      The current passes through water and causes a shock.

    • D. 

      The tool rusts.

  • 13. 
    Which statement is correct?
    • A. 

      A fuse is included in a circuit to prevent the current becoming too high.

    • B. 

      A fuse should be connected to the neutral wire in a plug.

    • C. 

      An electric circuit will only work if it includes a fuse.

    • D. 

      An earth wire is needed to prevent the fuse blowing.

  • 14. 
    A cable in a house is carrying too much current.What is the greatest danger?
    • A. 

      Appliances not working

    • B. 

      Electric shock

    • C. 

      Fire

    • D. 

      Low power

  • 15. 
    Resistors R3 and R4 are connected in:
  • 16. 
    Calculate the total current in the circuit below.
  • 17. 
    Calculate the potential difference (p.d.) across the 200 Ω resistor if the current passing through it is 0.025 A.
  • 18. 
    A cruise ship is anchored in a harbour. The crew holds a party for the guests on board, and theship’s electrical department decorates the decks with strings of coloured lamps.Each string of lamps contains thirty 100 V lamps. The strings of lamps are run from a 100 Vgenerator. The resistance of each lamp is 250 Ω. Ignore the resistance of the generator.State whether the lamps on a particular string are connected in series or in parallel. 
    • A. 

      Series

    • B. 

      Parallel

  • 19. 
    A cruise ship is anchored in a harbour. The crew holds a party for the guests on board, and theship’s electrical department decorates the decks with strings of coloured lamps.Each string of lamps contains thirty 100 V lamps. The strings of lamps are run from a 100 Vgenerator. The resistance of each lamp is 250 Ω. Ignore the resistance of the generator.Calculate the current in each lamp when it is at normal brightness.
  • 20. 
    What is the symbol for a fuse?
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