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  • Question

  • Assertion (A): The optical dielectric constant (i.e., ?r at optical frequencies)of ionic dielectrics is less than static dielectric constant.

    Reason (R): At optical frequencies, Pi = 0.


  • 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 

    • Materials and Components problems

    Search Results

    • 1. The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is

    • Options
    • A. zero
    • B. 2
    • C. 4
    • D. 6
      • Discuss
    • 2. Assertion (A): ?r can be determined experimentally by measuring the capacitance of a parallel plate capacitor with and without the dielectric.

      Reason (R): Capacitance of a parallel plate capacitor = .


    • 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
    • 3. Consider the following statement
      If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is

      1. both due to electrons and holes with electrons as majority carriers
      2. sum of hole and electron currents
      3. difference between electron and hole currents.
      Which of above statements are correct?

    • Options
    • A. 1 only
    • B. 1 and 2
    • C. 2 only
    • D. 3 only
      • Discuss
    • 4. Assertion (A): In many materials, dielectric polarization causes mechanical distortion.

      Reason (R): If dielectric polarization causes mechanical distortion then mechanical distortion must cause dielectric polarization.


    • 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
    • 5. In carbon resistor colour code, the third band is red. It indicates

    • Options
    • A. two zeros
    • B. three zeros
    • C. multiplier is 0.01
    • D. multiplier is 0.1
      • Discuss
    • 6. In a homogeneous magnetic field H of a solenoid, the core carries a magnetic dipole moment M per unit volume equal to

    • Options
    • A. ?0 H
    • B. ?r H
    • C. (?r - 1) H
    • D. ?o?r H
      • Discuss
    • 7. In molecules of ionic crystals, orientation polarization is zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Rochelle salt is a ferroelectric material.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Ferromagnetic materials

    • Options
    • A. shows spontaneous magnetisation below a certain temperature
    • B. have resistivity very high as compared to that of iron
    • C. can be used even at microwave frequencies
    • D. all of the above
      • Discuss
    • 10. The heat developed per m3 per second (W) in a conductor having a conductivity ? and a field E is

    • Options
    • A. W = ?E2
    • B. W = ?E
    • C. W =
    • D. W = (?E)0.5
      • Discuss

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