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  • Question

  • The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about


  • Options
  • A. sign of charge carrier
  • B. density of charge carrier
  • C. both sign and density of charge carrier
  • D. none of the above

  • Correct Answer
  • both sign and density of charge carrier 

    • Materials and Components problems

    Search Results

    • 1. If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

    • Options
    • A. double
    • B. one and a half time
    • C. 3 times
    • D. 4 times
      • Discuss
    • 2. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. A specimen of metal has n valence electrons per m3. If vx is the average velocity of these electrons, each having a charge e, the current density J is

    • Options
    • A. J = ne vx
    • B. J = - ne vx
    • C. J =
    • D. J =
      • Discuss
    • 4. Soft iron is suitable for making temporary magnets.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The Ohm's law for conduction in metals is

    • Options
    • A. J = ?E
    • B. J =
    • C. J ? ?E
    • D. J ?
      • Discuss
    • 6. When two conductors carry currents in the same direction the force is repulsive.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. When a trivalent impurity is added, the semiconductor becomes

    • Options
    • A. p type
    • B. n type
    • C. intrinsic
    • D. neutral
      • Discuss
    • 8. For dielectrics in alternating field, polarizability ae is a complex quantity. The imaginary part of ae is zero for

    • Options
    • A. ? = 0
    • B. ? ? ?
    • C. ? = 0 and ? ? ?
    • D. ? = natural frequency ?0
      • Discuss
    • 9. Bitter powder patterns prove the existence of domains.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ?, the magnetic dipole moment of orbit is 0.5 e?R2.

      Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.


    • 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

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