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  • Question

  • The orientation polarization is

    1. directly proportional to temperature
    2. inversely proportional to temperature
    3. inversely proportional to square of permanent dipole moment
    4. directly proportional to square of permanent dipole moment.
    Which of the above are correct?


  • Options
  • A. 1 and 3 only
  • B. 2 and 3 only
  • C. 1 and 4 only
  • D. 2 and 4 only

  • Correct Answer
  • 2 and 4 only 

    • Materials and Components problems

    Search Results

    • 1. The colour code on a carbon resistor is red-red-black-silver. The value of resistor is

    • Options
    • A. 22000 ?
    • B. 2200 ?
    • C. 22 ± 5% ?
    • D. 22 ± 10% ?
      • Discuss
    • 2. If v is the velocity of electron, tc is the average time between collisions, the mean free path ? = vtc.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. An iron specimen has µr = 1000 when B = 0.3 T. If B = 0.35 T, µr

    • Options
    • A. will be 1000
    • B. will be less than 1000
    • C. will be more than 1000
    • D. may be more or less than 1000
      • Discuss
    • 4. In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The class of insulation of impregnated paper is

    • Options
    • A. A
    • B. B
    • C. C
    • D. F
      • Discuss
    • 6. To produce magnetic flux, mmf is necessary.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In carbon resistor colour code, if the third band is of silver, it indicates

    • Options
    • A. that three zeros are to be added to indicate the resistance value
    • B. multiplier is 0.01
    • C. multiplier is 0.1
    • D. tolerance is ± 5%
      • Discuss
    • 8. Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.

      Reason (R): For a ferromagnetic material for T > ?f.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 9. A liquid has N permanent dipoles ?p per unit volume and has been subjected to dc field for a long time such that orientation polarization is P0. At t = 0, the field is suddenly removed, then polarization

    • Options
    • A. will remain constant at P0
    • B. will become zero at t = 0
    • C. will delay to zero with a time constant
    • D. either b or c
      • Discuss
    • 10. The temperature coefficient of a thermistor

    • Options
    • A. is positive
    • B. is negative
    • C. zero
    • D. may be positive or negative depending on its composition
      • Discuss

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