# Electronic Devices-Junction Transistor (NEET Physics): Questions 1 - 5 of 11

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## Question number: 1

» Electronic Devices » Junction Transistor

MCQ▾

### Question

Which of the following are false?

(1) Common base transistor is commonly used because current gain is maximum

(2) Common collector is commonly used because current gain is maximum

(3) Common emitter is the least used transistor

(4) Common emitter is commonly used because current gain is maximum

Select the correct answers and mark it according to the following codes.

### Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

## Question number: 2

» Electronic Devices » Junction Transistor

MCQ▾

### Question

In an NPN transistor circuit, the collector current is 10 mA. If 90 % of the electrons emitted reach the collector, the emitter current (I E) and base current (I B) are given by

### Choices

Choice (4) Response

a.

I E = 1mA, I B = 11mA

b.

I E = 11mA, I B = 1mA

c.

I E = 9mA, I B =- 1mA

d.

I E =- 1mA, I B = 9mA

## Question number: 3

» Electronic Devices » Junction Transistor

MCQ▾

### Question

If L 1, L 2, L 3 are the lengths of the emitter, base and collector of a transistor then,

### Choices

Choice (4) Response

a.

L 3 < L 2 > L 1

b.

L 1 = L 2 = L 3

c.

L 1 > L 3 > L 2

d.

L 3 < L 1 < L 2

## Question number: 4

» Electronic Devices » Junction Transistor

MCQ▾

### Question

In an NPN transistor 10 10 electrons enter the emitter in 10 -6 s and 2 % electrons recombine with holes in base, then α and β respectively are,

### Choices

Choice (4) Response

a.

α = 98, β = 0.49

b.

α = 49, β = 0.98

c.

α = 0.49, β = 98

d.

α = 0.98, β = 49

## Question number: 5

» Electronic Devices » Junction Transistor

MCQ▾

### Question

The transfer ratio of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 KΩ. The peak value for an A. C input voltage of 0.01 V peak is,

### Choices

Choice (4) Response

a.

100 μA

b.

0.25 mA

c.

500 μA

d.

0.01 mA

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