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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


  3. Overhead telephone wires are made of

  4. A.

     aluminium

    B.

     steel

    C.

     ACSR conductors

    D.

     Copper


  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


  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


  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


  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


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

  14. A.

     2n2

    B.

     4n2

    C.

     2n3

    D.

     4ns


  15. Carbon electrodes are not used in

  16. A.

     GLS lamps

    B.

     Electric arc furnace

    C.

     Dry cells

    D.

     Cinema projectors


  17. At transition temperature the value of critical field is

  18. A.

     Zero

    B.

     Negative real value

    C.

     Positive real value

    D.

     Complex value


  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