Question # 1

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

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

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Widened

Narrowed

Normal

None of these

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

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

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Inductor

Converter

Comparator

Thermistor

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

The device which are required to convert various physical quantities into electric voltage are called.

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Filters

Rectifiers

Amplifiers

Sensors

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

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

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Minority charge carriers

Majority charge carriers

Electrons

Protons

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

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1

2

3

4

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

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Inductor

Rectifier

Comparator

emf

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