Question # 1

A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is.

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1/4 R

4R

2R

Same as R

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

Paschen series lies in the

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Far ultraviolet region

Visible region

Ultraviolet region

Inferred region

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

A transistor has parts:

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2

3

4

5

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

e/m=

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v/Br

Br/V

VB/r

Vr/B

The SI unit of magnetic induction 'B' Tesla is equal to.

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NA-1m-1

Nam-1

NA-1 m

Na2m-1

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

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Filter

Amplifier

Resistor

Transistor

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

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