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  • Question

  • Dielectric constant of transformer oil is about


  • Options
  • A. 1
  • B. 4
  • C. 10
  • D. 20

  • Correct Answer
  • 4 

    • Materials and Components problems

    Search Results

    • 1. Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called

    • Options
    • A. crystal
    • B. covalent bond
    • C. molecule
    • D. valence bond
      • Discuss
    • 2. In metals, the average drift velocity of electron per unit field is called mobility.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In metals the thermal conductivity K and electrical conductivity ? are related as (K/?T) = L, L is known as

    • Options
    • A. Lattice constant
    • B. Lorentz number
    • C. Lanevin function
    • D. Larmor number
      • Discuss
    • 4. When a material becomes a superconductor, its resistivity becomes

    • Options
    • A. very small
    • B. zero
    • C. about 10% of normal value
    • D. about 20% of normal value
      • Discuss
    • 5. As the temperature of a pure silicon specimen is increased

    • Options
    • A. the number of free electrons increases
    • B. the number of holes decreases
    • C. the number of holes increases
    • D. the number of free electrons and holes increases
      • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

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