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12th Standard English Medium Physics Subject Electronics and Communication Book Back 1 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. The barrier potential of a silicon diode is approximately, ______.

    (a)

    0.7 V

    (b)

    0.3 V

    (c)

    2.0 V

    (d)

    2.2 V

  2. A forward biased diode is treated as ________________.

    (a)

    An open switch with infinite resistance

    (b)

    A closed switch with a voltage drop of 0V

    (c)

    A closed switch in series with a battery voltage of 0.7V

    (d)

    A closed switch in series with a small resistance and a battery

  3. The zener diode is primarily used as ______.

    (a)

    Rectifier

    (b)

    Amplifier

    (c)

    Oscillator

    (d)

    Voltage regulator

  4. The light emitted in an LED is due to ______.

    (a)

    Recombination of charge carriers

    (b)

    Reflection of light due to lens action

    (c)

    Amplification of light falling at the junction

    (d)

    Large current capacity

  5. The specific characteristic of a common emitter amplifier is _______________.

    (a)

    High input resistance

    (b)

    Low power gain

    (c)

    Signal phase reversal

    (d)

    Low current gain

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