logo

CuriousTab

CuriousTab

Discussion


Home Electronics and Communication Engineering Materials and Components Comments

  • Question
  • A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is


  • Options
  • A. 106 / cm3
  • B. 108 / cm3
  • C. 1010 / cm3
  • D. 1012 / cm3

  • Correct Answer
  • 108 / cm3 


  • Materials and Components problems


    Search Results


    • 1. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

    • Options
    • A. True
    • B. False
    • Discuss
    • 2. Hysteresis curve is associated with motion of domain walls.

    • Options
    • A. True
    • B. False
    • Discuss
    • 3. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 4. At 0 K, silicon and germanium behave like monoatomic crystals.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. A magnet does not attract

    • Options
    • A. nickel
    • B. iron
    • C. copper
    • D. iron and copper
    • Discuss
    • 6. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. Iron has a body centred cubic structure.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Sulphur hexafluoride is used in

    • Options
    • A. transformers
    • B. generators
    • C. relays
    • D. circuit breakers
    • Discuss
    • 9. A rare gas has N atoms per m3. If electronic polarizability of single atom of this gas is ae, then

    • Options
    • A. ?r = Nae
    • B. ?0?r = Nae
    • C. ?0(?r - 1) = Nae
    • D. ?0(?r - 2) = Nae
    • Discuss
    • 10. M = (?r - 1)H.

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


    Comments

    There are no comments.

Enter a new Comment