Physics GK 24 - Electronics Basics

1. When is a p-n diode said to be forward biased?
[A] when p-side is connected to the positive terminal of the battery
[B] when n-side is connected to the positive terminal of the battery
[C] when p-side is connected to the negative terminal of the battery
[D] None of the above

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2. What is the total diode forward current?
[A] hole diffusion current
[B] difference between hole diffusion current and conventional current due to electron diffusion
[C] sum of hole diffusion current and conventional current due to electron diffusion
[D] None of the above

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3. What is a p-n diode said to be in reverse-bias?
[A] positive terminal of the external battery is connected to the p-side
[B] positive terminal of the external battery is connected to the n-side
[C] negative terminal of the external battery is connected to the n-side
[D] None of the above

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4. Which of the following is correct about reverse biasing?
[A] the barrier height increases
[B] the depletion region widens
[C] Both a and b
[D] None of the above

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5. What is the minimum number of logic gates in a VLSI?
[A] 10
[B] 100
[C] 1000
[D] 10000

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6. Which of these are called as Universal logic gates?
[A] NAND
[B] NOR
[C] NOT
[D] Both a and b

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7. Which of these devices is used to increase the power of a signal?
[A] Amplifier
[B] Voltage regulator
[C] Attenuator
[D] All of the above

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8. What do we call the ratio of change in collector-emitter voltage to the resulting change in the collector current at constant base current, when the transistor is being used in Common Emitter configuration?
[A] Input dynamic resistance
[B] Output dynamic resistance
[C] Output emitter Current
[D] Input emitter Current

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9. Which of the following is NOT the criteria for material selection for a solar cell?
[A] It should be cost effective
[B] It should have a band gap between 1.0 and 1.7 eV
[C] It should have low absorption coefficient
[D] All of the above

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10. What is rectifier used for?
[A] for converting alternating current into direct current
[B] for converting direct current into alternating current
[C] for increasing the power of signal
[D] for decreasing the voltage

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