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  1. Effect of moisture on the insulating materials is to

  2. A.

     Decrease dielectric constant

    B.

     Decrease dielectric strength

    C.

     Decrease insulation resistance

    D.

     Increase dielectric loss

    E.

     All of the above


  3. Superconducting metal in super conducting state has relative permeability of

  4. A.

     Zero

    B.

     One

    C.

     Negative

    D.

     More than one


  5. Which of the following is the poorest conductor of electricity ?

  6. A.

     Carbon

    B.

     Steel

    C.

     Silver

    D.

     Aluminium


  7. Which of the following materials is the best conductor of electricity ?

  8. A.

     Tungsten

    B.

     Aluminium

    C.

     Copper

    D.

     Carbon


  9. The conductivity of an extrinsic semiconductor with temperature

  10. A.

     Decreases

    B.

     Increases

    C.

     Remains constant

    D.

     All of the above


  11. Which of the following are non-conductors of electricity?

  12. A.

     Non-metal solids except carbon

    B.

     Air and most other gases

    C.

     Pure water and liquids in general except mercury

    D.

     All of the above


  13. Commonly used conducting materials are

  14. A.

     Copper

    B.

     Aluminium

    C.

     Both A and B

    D.

     Copper and silver

    E.

     Platinum and gold


  15. Is the property of absorbing moisture from atmosphere.

  16. A.

     Solubility

    B.

     Viscosity

    C.

     Porosity

    D.

     Hygroscopicity


  17. _______ is an example of piezoelectric material.

  18. A.

     Glass

    B.

     Quartz

    C.

     Corrundum

    D.

     Neoprene