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  1. The superconductivity is due to

  2. A.

     The crystal structure having no atomic vibration at 0°K

    B.

     All electrons interact in the super-conducting state

    C.

     The electrons jump into nucleus at 0°K

    D.

     None of the above

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  3. Overhead telephone wires are made of

  4. A.

     aluminium

    B.

     steel

    C.

     ACSR conductors

    D.

     Copper

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  5. _________ is most commonly used for making magnetic recording tape

  6. A.

     Silver nitrate

    B.

     Ferric oxide

    C.

     Small particles of iron

    D.

     Silicon-iron

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  7. A good electric contact material should have all of the following properties except

  8. A.

     High resistivity

    B.

     High resistance to corrosion

    C.

     Good thermal conductivity

    D.

     High melting point

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  9. Non-linear resistors

  10. A.

     Produce harmonic distortion

    B.

     Follows Ohm’s law at low temperatures only

    C.

     Result in non-uniform heating

    D.

     None of the above

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  11. The covalent bond is formed by

  12. A.

     Transfer of electrons between atoms

    B.

     Sharing of electrons between atoms

    C.

     Sharing of variable number of electrons by a variable number of atoms

    D.

     None of the above

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  13. The formula __________ determines the number of electrons that can be accommodated in any level.

  14. A.

     2n2

    B.

     4n2

    C.

     2n3

    D.

     4ns

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  15. Carbon electrodes are not used in

  16. A.

     GLS lamps

    B.

     Electric arc furnace

    C.

     Dry cells

    D.

     Cinema projectors

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  17. At transition temperature the value of critical field is

  18. A.

     Zero

    B.

     Negative real value

    C.

     Positive real value

    D.

     Complex value

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  19. Solder is an alloy of

  20. A.

     Copper and aluminium

    B.

     Tin and lead

    C.

     Nickel, Copper and zinc

    D.

     Silver, copper and lead

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