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EEE :: Current Electricity

  1. A substance whose molecules consist of dissimilar atoms is called

  2. A.

     Semiconductor

    B.

     Super-conductor

    C.

     Compound

    D.

     Insulator

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  3. If a parallel circuit is opened in the main line, the current

  4. A.

     Increases in the branch of the lowest resistance

    B.

     Increases in each branch

    C.

     Is zero in all branches

    D.

     Is zero in the highest resistive branch

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  5. Out of the following which is an insulating material?

  6. A.

     Copper

    B.

     Gold

    C.

     Silver

    D.

     Paper

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  7. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be

  8. A.

     80 m

    B.

     60 m

    C.

     40 m

    D.

     20 m

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  9. Ohm's law is not applicable to

  10. A.

     Semiconductors

    B.

     D.C. circuits

    C.

     Small resistors

    D.

     High currents

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  11. Ohm’s law is not applicable to

  12. A.

     vacuum tubes

    B.

     carbon resistors

    C.

     high voltage circuits

    D.

     circuits with low current densities

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  13. When electric current passes through a metallic conductor, its temperature rises. This is due to

  14. A.

     Collisions between conduction electrons and atoms

    B.

     The release of conduction electrons from parent atoms

    C.

     Mutual collisions between metal atoms

    D.

     Mutual collisions between conducting electrons

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  15. The number of electrons in the outer most orbit of carbon atom is

  16. A.

     3

    B.

     4

    C.

     6

    D.

     7

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  17. If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to

  18. A.

     I²Rt

    B.

     I²Rt²

    C.

     I²R²t

    D.

     I²R²t²

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  19. What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is

  20. A.

     Practically zero

    B.

     Low

    C.

     High

    D.

     Very high

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