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  1. Lightning is produced when

  2. A.

     Similar charges of electricity rush towards each other and then get repelled

    B.

     Clouds strike against impurities in air and the friction burns up these impurities

    C.

     Strong opposite charges in different clouds break down the resistance offered by the intervening air

    D.

     Water vapour produces electricity in the clouds

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  3. The metal used to make lightning conductors is

  4. A.

     Iron

    B.

     Aluminium

    C.

     Copper

    D.

     Zinc

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  5. Good conductor of electricity is

  6. A.

     Dry air

    B.

     Paper

    C.

     Kerosene

    D.

     Graphite

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  7. One Kilowatt hour is equal to -

  8. A.

     3.6 Mega Joule

    B.

     3.8 Mega Joule

    C.

     3.2 Mega Joule

    D.

     4.0 Mega Joule

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  9. Materials that usually are good conductors of electricity?

  10. A.

     Aluminium

    B.

     Lead

    C.

     Nickel

    D.

     Wood

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  11. Pure water is bad conductor of electricity because it is

  12. A.

     Feebly ionized

    B.

     Not volatile

    C.

     A very good solvent

    D.

     A non-polar solvent

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  13. The metal whose electrical conductivity is more, is

  14. A.

     Copper

    B.

     Aluminium

    C.

     Silver

    D.

     Lead

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  15. Which of the following is a conductor of electricity ?

  16. A.

     Rubber

    B.

     Pure water

    C.

     Salt water

    D.

     Benzene

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  17. A bird sitting on a high tension electric wire does not get electrocuted because

  18. A.

     It has high resistance

    B.

     The body is earthed

    C.

     It does not form a closed path for the flow of current

    D.

     Its feet are good insulators

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  19. The fuse in our domestic electric circuit melts when there is a high rise in

  20. A.

     Inductance

    B.

     Current

    C.

     Resistance

    D.

     Capacitance

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