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  • Question

  • As the temperature increases the mobility of electrons __________ .


  • Options
  • A. decreases because the number of carries increases with increased collisions
  • B. increases because the number of carries decreases with decreased collisions
  • C. remains same
  • D. none of the above

  • Correct Answer
  • decreases because the number of carries increases with increased collisions 

    Explanation
    Mobility of electrons As the temperature increases the mobility of electrons __________ . decreases because the number of

    m = 2.5 for electrons and 2.7 for holes in Si.

    More questions

    • 1. The symbol in figure is for

    • Options
    • A. UJT
    • B. PUT
    • C. SCS
    • D. SBS
      • Discuss
    • 2. Which of these devices can conduct in both directions?

    • Options
    • A. SCR
    • B. SUS
    • C. SBS
    • D. UJT
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    • 3. In the given figure forward current wave has a magnitude of

    • Options
    • A. 0.45 A
    • B. 0.3 A
    • C. 0.2 A
    • D. 0.1 A
      • Discuss
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    • Options
    • A. milliwatts
    • B. kilowatts
    • C. picowatts
    • D. watts
      • Discuss
    • 5. The temperature at which some materials become superconductors is called

    • Options
    • A. Transition temperature
    • B. Curie temperature
    • C. Neel temperature
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    • 6. The advantage of modified series inverter with two inductors and two capacitors is

    • Options
    • A. the intermittent operation of battery is avoided
    • B. efficiency of circuit is more
    • C. the output frequency is low
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      • Discuss
    • 7. A chopper cannot be line commutated.

    • Options
    • A. True
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    • Options
    • A. gang condenser
    • B. variable selectivity
    • C. paddar capacitor
    • D. any of the above
      • Discuss
    • 9. In TE and TM modes of rectangular waveguides having propagation in z direction

    • Options
    • A. Ez and Hz are both zero
    • B. In TE mode Ez is zero and in TM mode Hz is zero
    • C. In TE mode Hz is zero and in TM mode Ez is zero
    • D. In both TE and TM modes both Ez and Hz are non-zero
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    • Options
    • A. MF
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