Revision On Electricity (SEC 2)

17 Questions | Total Attempts: 1065

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Revision On Electricity (SEC 2)

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Questions and Answers
  • 1. 
    The S.I unit of charge is coulomb, C. 
    • A. 

      True

    • B. 

      False

  • 2. 
    ___________ is the rate of flow of charge. 
  • 3. 
    The S.I unit for potential difference is _______ 
  • 4. 
    Three identical bulbs are connected in series. If the current passing through the first bulb is 3 A, then the current passing through the second bulb is 2 A and the current passing through the last bulb is 1A.
    • A. 

      True

    • B. 

      False

  • 5. 
    Three bulbs are connected in series. If the potential difference across each bulb is the same, then the resistance of each bulb must also be the same.
    • A. 

      True

    • B. 

      False

  • 6. 
    Three bulbs are connected in parallel. The potential difference across each bulb will be the same. Even if the bulbs have different resistance.
    • A. 

      True

    • B. 

      False

  • 7. 
    Three bulbs are connected in parallel, if the currect through each bulb is the same, then the resistance of the bulbs must be the same too.
    • A. 

      True

    • B. 

      False

  • 8. 
    Three identical bulbs are connected in parallel, if the effective resistance of the circuit is 3 ohms, what is the resistance of each bulb?
    • A. 

      0.3 ohms

    • B. 

      1 ohms

    • C. 

      3 ohms

    • D. 

      9 ohms

  • 9. 
    An ammeter has _________ resistance. 
  • 10. 
    A voltmeter has _________ resistance. 
  • 11. 
    The resistance of an ohmic metal wire does not depend on  
    • A. 

      Its length.

    • B. 

      Its material.

    • C. 

      Its cross-sectional area.

    • D. 

      The potential difference supplied across it.

  • 12. 
    Which of the following statements about electrical power is true? 
    • A. 

      Power is the rate at which energy is changed from one form to another.

    • B. 

      The S.I unit of power is Joules.

    • C. 

      Power = Voltage X Current

    • D. 

      Energy X Time = Power

  • 13. 
    The earth wire is at zero potential. 
    • A. 

      True

    • B. 

      False

  • 14. 
    The fuse should be connected to the _____ wire.
  • 15. 
    The correct colour of the Live wire is 
    • A. 

      Brown

    • B. 

      Green

    • C. 

      Blue

  • 16. 
    The correct colour of the Earth wire is 
    • A. 

      Brown

    • B. 

      Yellow and green

    • C. 

      Blue

  • 17. 
    Which of the following statements is incorrect? 
    • A. 

      The switch of an appliance can be installed at the live wire or the neutral wire.

    • B. 

      Appliances without Earth wire can still function.

    • C. 

      Earth wire connects the body of an appliance to Earth so that the appliance will not become live.

    • D. 

      The potential at the neutral wire is always zero.