Physics GK 24 - Electronics Basics

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1).
When is a p-n diode said to be forward biased?
2).
What is the total diode forward current?
3).
What is a p-n diode said to be in reverse-bias?
4).
Which of the following is correct about reverse biasing?
5).
What is the minimum number of logic gates in a VLSI?
6).
Which of these are called as Universal logic gates?
7).
Which of these devices is used to increase the power of a signal?
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?
9).
Which of the following is NOT the criteria for material selection for a solar cell?
10).
What is rectifier used for?
11).
What happens to the resistance of a p-n junction diode when forward biased?
12).
What is the ratio of the change in collector current to the change in base current at a constant collector-emitter voltage, when the common emitter transistor is in active state, known as?
13).
In which of these transistors, the two segments of n-type semiconductor are separated by a segment of p-type semiconductor?
14).
Which of the following diodes is mostly commonly used as a voltage regulator?
15).
Which of these diodes is used to detect optical signals?
16).
Which of these diodes convert electrical energy into light?
17).
What is the output of an AND gate when both the inputs are 0?
18).
What is the output of an OR gate when both the inputs are 1?
19).
Which of the following is true about working of a photo diode?
20).
Which type of semiconductor do we get when pure silicon is doped with a group-5 element?
21).
Which of these dopants is NOT used to increase the conductivity of a semi-conductor?
22).
Which type of semiconductor do we get when pure silicon is doped with a group-3 element?
23).
Which of these is an acceptor impurity?
24).
What are the majority charge carriers in p-type semiconductors?
25).
How does a semiconductor behave at absolute zero temperature?
26).
What is the charge of a p-type semiconductor?
27).
What is the barrier potential for Germanium?
28).
Which of these is used as a material for making semiconductor devices?
29).
Which of the following is correct about conductors?
30).
What do we call an undoped semiconductor?
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
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
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
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
5. What is the minimum number of logic gates in a VLSI?
[A] 10
[B] 100
[C] 1000
[D] 10000
6. Which of these are called as Universal logic gates?
[A] NAND
[B] NOR
[C] NOT
[D] Both a and b
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
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
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
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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