Question # 1

For automatic Switching of streetlight, the op amplifier is used as.

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Inductor

Converter

Comparator

Thermistor

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

In case of reverse biasing, current is flown due to:

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Minority charge carriers

Majority charge carriers

Electrons

Protons

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

Transistors are made from

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Plastics

Metals

Insulator

Doped semi conductors

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The symbol of p-n-p transistor is

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The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

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