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  • Question
  • Assertion (A): Dielectric constant is independent of temperature unless the temperature is extremely high.

    Reason (R): For normal temperatures the number of atoms per unit volume is constant.


  • 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

  • Correct Answer
  • Both A and R are true and R is correct explanation of A 

    Explanation
    For normal temperatures the dielectric constant depends on the number of atoms per unit volume.

    Materials and Components problems


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    • 1. Carbon steel has a residual flux density of 1 Wb/m2.

    • Options
    • A. True
    • B. False
    • Discuss
    • 2. As the atoms of rare gases become larger, electronic polarizability

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. may increase or decrease
    • Discuss
    • 3. A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. The number of protons in a silicon atom are

    • Options
    • A. 4
    • B. 8
    • C. 12
    • D. 14
    • Discuss
    • 5. A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at room temperature. At a temperature of 700 K, the resistivity is likely to be

    • Options
    • A. 1.6 x 10-8 ?-m
    • B. 2 x 10-8 ?-m
    • C. 3 x 10-8 ?-m
    • D. 6 x 10-8 ?-m
    • Discuss
    • 6. The fact that domains exhibits spontaneous magnetisation is

    • Options
    • A. first hypothesis is of Curie
    • B. second hypothesis is of Weiss
    • C. Curie-Weiss law
    • D. Boltzmann's statistics
    • Discuss
    • 7. The number of protons in a copper atom are

    • Options
    • A. 2
    • B. 9
    • C. 11
    • D. 29
    • Discuss
    • 8. The most important set of specifications of transformer oil include

    • Options
    • A. dielectric strength and viscosity
    • B. dielectric strength and flash point
    • C. viscosity and flash point
    • D. flash point and viscosity
    • Discuss
    • 9. If ?p is permanent dipole moment and T is absolute temperature, the orientation polarization of polyatomic gases is

    • Options
    • A. proportional to ?p2T
    • B. proportional to
    • C. proportional to ?p T
    • D. proportional to
    • Discuss
    • 10. We can know the arrangement of atom in a material by studying electron diffraction pattern.

    • Options
    • A. True
    • B. False
    • Discuss


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