objective question

1. 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
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

2. Electronics Basics
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

3. Electronics Basics
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

4. Electronics Basics
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
11. What happens to the resistance of a p-n junction diode when forward biased?
[A] It becomes high
[B] No effect
[C] it becomes low
[D] it becomes zero
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?
[A] Input resistance
[B] Output resistance
[C] Current amplification factor
[D] None of the above

5. Electronics Basics
13.In which of these transistors, the two segments of n-type semiconductor are
separated by a segment of p-type semiconductor?
[A] p-n-p transistor
[B] n-p-n transistor
[C] Both a and b
[D] None
14.Which of the following diodes is mostly commonly used as a voltage regulator?
[A] LED
[B] Varactor diode
[C] Shockley diode
[D] Zener diode
15.Which of these diodes is used to detect optical signals?
[A] Photodiode
[B] Light emitting diode
[C] Photovoltaic diode
[D] None of the above

6. Electronics Basics
16.Which of these diodes convert electrical energy into light?
[A] Photodiodes
[B] Light emitting diodes
[C] Photovoltaic devices
[D] None
17.What is the output of an AND gate when both the inputs are 0?
[A] 0
[B] 1
[C] Either 0 or 1
[D] 2
18.What is the output of an OR gate when both the inputs are 1?
[A] 0
[B] 1
[C] Either 0 or 1
[D] None

7. Electronics Basics
19.Which of the following is true about working of a photo diode?
[A] It is operated under reverse bias
[B] It is operated under forward bias
[C] Both a and b
[D] None
20.Which type of semiconductor do we get when pure silicon is doped with a
group-5 element?
[A] n-type semiconductor
[B] p-type semiconductor
[C] Intrinsic semiconductor
[D] None of the above
21. Which of these dopants is NOT used to increase the conductivity of a semi-
conductor?
[A] Indium
[B] Aluminium
[C] Arsenic
[D] Boron

8. Electronics Basics
22.Which type of semiconductor do we get when pure silicon is doped with a
group-3 element?
[A] n-type semiconductor
[B] p-type semiconductor
[C] Intrinsic semiconductor
[D] None
23.Which of these is an acceptor impurity?
[A] Phosphorus
[B] Arsenic
[C] Antimony
[D] Indium
24.What are the majority charge carriers in p-type semiconductors?
[A] electrons
[B] holes
[C] equal concentration of holes and electrons
[D] None of the above

9. Electronics Basics
25.How does a semiconductor behave at absolute zero temperature?
[A] like an insulator
[B] like a conductor
[C] depends on the material
[D] None of the above
26.What is the charge of a p-type semiconductor?
[A] Positive
[B] Negative
[C] Neutral
[D] None of the above
27. What is the barrier potential for Germanium?
[A] 0.3 V
[B] 0.7 V
[C] 1 V
[D] 1.7 V

10. Electronics Basics
28. Which of these is used as a material for making semiconductor devices?
[A] Silicon
[B] Germanium
[C] Gallium Arsenide
[D] All of the above
29. Which of the following is correct about conductors?
[A] The conduction band and the valence band partly overlap each other
[B] There is no forbidden energy band gap between conduction band and the
valence band
[C] Both a and b
[D] None of the above
30. What do we call an undoped semiconductor?
[A] Intrinsic semiconductor
[B] Extrinsic semiconductor
[C] p-type semiconductor
[D] None of the above

11. Electronics Basics