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  1. The value of critical field below the transition temperature will

  2. A.

     Increase

    B.

     Decrease

    C.

     Remain unchanged

    D.

     Any of the above

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  3. Is viscoelastic.

  4. A.

     Cast-iron

    B.

     Graphite

    C.

     Rubber

    D.

     Glass

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  5. Which of the following factors affect resistivity of metals ?

  6. A.

     Age hardening

    B.

     Alloying

    C.

     Temperature

    D.

     Cold work

    E.

     All of the above

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  7. By increasing impurity content in the metal alloy the residual resistivity always

  8. A.

     Decreases

    B.

     Increases

    C.

     Remains constant

    D.

     Becomes temperature independent

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  9. Carbon bearings are used under which of the following conditions ?

  10. A.

     Where lubrication is difficult or im-possible

    B.

     Where corrosive chemical action exists

    C.

     Where high temperature exists

    D.

     All of the above

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  11. For a hole which of the following statements is incorrect ?

  12. A.

     Holes can exist in certain semiconductors only

    B.

     Holes can exist in any material including conductors

    C.

     Holes may constitute an electric current

    D.

     Holes can be considered as a net positive charge

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  13. Substances whose specific resistance abruptly decreases at very low temperature are called

  14. A.

     Insulators

    B.

     Conductors

    C.

     Semiconductors

    D.

     Superconductors

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  15. The impurity atoms is semiconductors

  16. A.

     Inject more charge carriers

    B.

     Reduce the energy gap

    C.

     Increase the kinetic energy of valence electrons

    D.

     All of the above

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  17. The photo-electric effect occurs only when the incident light has more than a certain critical

  18. A.

     Intensity

    B.

     Speed

    C.

     Frequency

    D.

     Wave length

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  19. Carbon rods are used in wet and dry cells because

  20. A.

     Carbon rod serves as conductor

    B.

     Carbon can resist the attack of battery acid

    C.

     Both A and B

    D.

     Either A or B

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