Electricity and Magnetism


  1. At the time of short circuit, the current in the circuit









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    increases heavily

    Correct Option: B

    increases heavily


  1. Which of the following is the best conductor of electricity ?









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    Silver is the best conductor of electricity.

    Correct Option: C

    Silver is the best conductor of electricity.



  1. A 100 watt electric bulb is used for 10 hours. What will be the cost of electricity consumed, if the consumption cost is ₹ 5 per unit ?









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    The cost of electricity will be ₹ 5.
    1 unit of electricity
    = 1 kwh (1 kilowatt hour)
    = 100/1000 kilowatt x 10 hour
    = 1 unit hence electricity bill
    = 1 x 5 = ₹ 5

    Correct Option: A

    The cost of electricity will be ₹ 5.
    1 unit of electricity
    = 1 kwh (1 kilowatt hour)
    = 100/1000 kilowatt x 10 hour
    = 1 unit hence electricity bill
    = 1 x 5 = ₹ 5


  1. Dynamo is a machine which is used for conversion of









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    Dynamo is a machine which is used for conversion of mechanical energy to electrical energy .

    Correct Option: D

    Dynamo is a machine which is used for conversion of mechanical energy to electrical energy .



  1. In a three pin plug, the longest pin should be connected to









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    In a three pin plug longest pin should be connected to ground terminal. Ground pin is the largest to supply the additional voltage that can give electric shock. And being the longest it can touch before live and neutral terminal.

    Correct Option: A

    In a three pin plug longest pin should be connected to ground terminal. Ground pin is the largest to supply the additional voltage that can give electric shock. And being the longest it can touch before live and neutral terminal.