Question # 1

Improper bisting of a transistor circiut produces:

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Heavy loading of emitter current

Distortion in the output output signal

Excessive heat at collector terminal

Faculty location of load line

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

To convert a galvanometer into a volt meter a high resistance is connected.

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In series

In parallel

In perpendicular

Along tangent

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

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