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Semiconductor Electronics Model Question Paper

12th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 15
    15 x 1 = 15
  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. If a small amount of antimony (Sb) is added to germanium crystal,______.

    (a)

    it becomes a p-type semiconductor

    (b)

    the antimony becomes an acceptor atom

    (c)

    there will be more free electrons than hole in the semiconductor

    (d)

    its resistance is increased

  3. 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

  4. If a positive half-wave rectified voltage is fed to a load resistor, for which part of a cycle there will be current flow through the load?

    (a)

    00–900

    (b)

    900–1800

    (c)

    00–1800

    (d)

    00–3600

  5. The zener diode is primarily used as ______.

    (a)

    Rectifier

    (b)

    Amplifier

    (c)

    Oscillator

    (d)

    Voltage regulator

  6. The principle based on which a solar cell operates is______.

    (a)

    Diffusion

    (b)

    Recombination

    (c)

    Photovoltaic action

    (d)

    Carrier flow

  7. 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

  8. When a transistor is fully switched on, it is said to be _________________.

    (a)

    Shorted

    (b)

    Saturated

    (c)

    Cut-off

    (d)

    Open

  9. 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

  10. To obtain sustained oscillation in an oscillator,______.

    (a)

    Feedback should be positive

    (b)

    Feedback factor must be unity

    (c)

    Phase shift must be 0 or 2π

    (d)

    All the above

  11. If the input to the NOT gate is A = 1011, its output is ______.

    (a)

    0100

    (b)

    1000

    (c)

    1100

    (d)

    0011

  12. The electrical series circuit in digital form is

    (a)

    AND

    (b)

    OR

    (c)

    NOR

    (d)

    NAND

  13. Which one of the following represents forward bias diode?

    (a)

    (b)

    (c)

    (d)

  14. The given electrical network is equivalent to ______.

    (a)

    AND gate

    (b)

    OR gate

    (c)

    NOR gate

    (d)

    NOT gate

  15. The output of the following circuit is 1 when the input ABC is______.

    (a)

    101

    (b)

    100

    (c)

    110

    (d)

    010

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