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Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
  • Question

  • The resistivity of intrinsic semiconductors, at room temperature, is of the order of


  • Options
  • A. 1 ?-m
  • B. 1000 ?-m
  • C. 106 ?-m
  • D. 10-3 ?-m

  • Correct Answer
  • 1 ?-m 

    • Materials and Components problems

    Search Results

    • 1. A material has N spins per m3. If Np are the dipoles per m3 parallel to field and Na are the dipoles per m3 anti-parallel to field, the magnetisation is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to

    • Options
    • A. n A
    • B. (n - 1) A
    • C. (n + 1) A
    • D.
      • Discuss
    • 3. At a temperature of about 1 K, aluminium is a

    • Options
    • A. conductor
    • B. insulator
    • C. photoconductor
    • D. superconductor
      • Discuss
    • 4. The circumference of an electron orbit is equal to integer times the wavelength of electron.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Permeability is analogous to

    • Options
    • A. resistivity
    • B. retentivity
    • C. conductivity
    • D. coercivity
      • Discuss
    • 6. The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi

    • Options
    • A. must be all positive
    • B. must be all negative
    • C. must be such that Qi = 0
    • D. either (a) or (b)
      • Discuss
    • 7. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The capacitance of an insulated conducting sphere of radius R in vacuum is

    • Options
    • A. 2p?0R
    • B. 4p?0R
    • C. 4p?0R2
    • D. 4p
      • Discuss
    • 9. Thermistor is used in

    • Options
    • A. temperature measurement
    • B. temperature control
    • C. high temperature alarm circuits of devices
    • D. all of the above
      • Discuss
    • 10. The hysteresis loss is

    • Options
    • A. proportional to frequency
    • B. independent of frequency
    • C. proportional to (frequency)2
    • D. proportional to
      • Discuss

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