logo

CuriousTab

CuriousTab

Discussion

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

  • The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)


  • Options
  • A. 0.40
  • B. 0.16
  • C. 0.04
  • D. 0.01

  • Correct Answer
  • 0.01 

    • Materials and Components problems

    Search Results

    • 1. The number of valence electrons in germanium atom is

    • Options
    • A. 4
    • B. 2
    • C. 1
    • D. zero
      • Discuss
    • 2. The materials having low retentivity are suitable for making

    • Options
    • A. temporary smagnets
    • B. weak magnets
    • C. permanent magnets
    • D. both temporary and permanent magnets
      • Discuss
    • 3. Automobile ignition systems use the principle of

    • Options
    • A. resistance
    • B. self inductance
    • C. mutual inductance
    • D. capacitance
      • Discuss
    • 4. If ?0 is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ?, when a magnetic field B is acting is ? ? ?0 + (e/2m)B.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. When an atom of polarizability a is placed in an electric field E, the energy stored in atom is 0.5 a E2.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Lines of magnetic field attract each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. If temperature is increased, the temperature coefficient of a metal

    • Options
    • A. increases
    • B. decreases
    • C. may increase or decrease
    • D. remains constant
      • Discuss
    • 8. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ?0(?r - 1) E.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The temperature at which some materials become superconductors is called

    • Options
    • A. Transition temperature
    • B. Curie temperature
    • C. Neel temperature
    • D. Onnes temperature
      • Discuss
    • 10. A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan ? = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are

    • Options
    • A. 10-8 W
    • B. 10-6 W
    • C. 10-4 W
    • D. 10-2 W
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.