NEET Physics Junction Transistor MCQs Set A

a) metal oxides with high temperature coefficient of resistivity

b) metals with high temperature coefficient of resistivity

c) metals with low temperature coefficient of resistivity

d) semiconducting materials having low temperature coefficient of resistivity

Answer: metal oxides with high temperature coefficient of resistivity

Question: To use a transistor as an amplifier, emitter-base junction is kept in ...X... and base-collector junction is kept in ...Y... Here, X and Y refer to

a) forward bias, reverse bias

b) reverse bias, forward bias

c) reverse bias, reverse bias

d) forward bias, forward bias

Answer: forward bias, reverse bias

Question: A transistor has three impurity regions. All the three regions have different doping levels. In order of increasing doping level, the regions are

a) base, collector and emitter

b) base, emitter and collector

c) collector, base and emitter

d) emitter, base and collector

Answer: base, collector and emitter

Question: When npn transistor is used as an amplifier

a) holes move from base to emitter

b) electrons move from base to collector

c) holes move from emitter to base

d) electrons move from collector to base

Answer: holes move from base to emitter

Question:  Current gain in common emitter configuration is more than 1 because

a)

b)

c)

d) None of these

Answer:

More Questions..........................................................

Question: In a common base amplifier, the phase difference between the input signal voltage and output voltage is

a) 0

b)

c)

d)

Answer: 0

Question:

a) – 48.78

b) – 5.2

c) – 15.7

d) – 24.8

Answer: – 48.78

Question:

a) 49

b) 50

c) 48

d) 51

Answer: 49

Question: A transistor has a base current of 1 mA and emitter current 90 mA. The collector current will be

a) 89 mA

b) 91 mA

c) 1 mA

d) 90 mA

Answer: 89 mA

Question:

a) 600

b) 560

c) 460

d) 500

Answer: 600

Question: For a common base amplifier, the values of resistance gain and voltage gain are 3000 and 2800 respectively. The current gain will be

a) 0.93

b) 0.83

c) 0.98

d) 1.1

Answer:  0.93

Question:

a) 4 . 8

b) 2 . 4

c) 480

d) 8 . 4

Answer: 4 . 8

Question: The current gain of a transistor in common base mode is 0.995. The current gain of the same transistor in common emitter mode is

a) 199

b) 198

c) 201

d) 197

Answer:  199

Question:

a) a common emitter amplifier circuit

b) a common base amplifier circuit

c) a common collector amplifier circuit

d) neither of the above

Answer: a common emitter amplifier circuit

Question:

a) 62 V

b) 620 V

c) 6.2 V

d) 0.62 V

Answer:  62 V