Question # 1

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

Transistors are made from

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Plastics

Metals

Insulator

Doped semi conductors

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

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

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Filter

Amplifier

Resistor

Transistor

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

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