Question # 1

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

A transistor has:

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Two regions

Three regions

Single regions

Four regions

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

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

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An oscillator

Detector

An amplifier

Rectifier

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

Transistors are made from

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Plastics

Metals

Insulator

Doped semi conductors

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

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

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

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