Question # 1

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

In full wave rectification number of diodes required are equal to.

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2

3

4

5

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

Truth table of logic function.

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Summarize its output values only

Tabulates all its input conditions only

Display all its input and output possibility

Is not base on logic algebra

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

A two inputs NAND gat with inputs a and b has an output '0' if.

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B is zero

A is zero

Both A and B are 1

Both A and B are '0'

The resistance between the inverting (-) and non inverting inputs is called Input resistance and is the order of.

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Ohms

Kilo Ohms

Mega Ohms

Thounds Ohms

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

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