Question # 1

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

the number of terminals in a semiconductor diode are

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2

3

4

5

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

The symbol of p-n-p transistor is

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The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

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