Question # 1

The process by which electrons are emitted by a hot metal surface is

known as:

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Boiling

Evaportion

Conduction

Thermionic emission

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

parallel plate consists of 2 metal plates separated by:

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conductor

insulator

wooden plate

plastic foam

When a body moves to and fro about a point its motion is called:

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Random motion

Linear motion

Vibratory motion

Rotatory motion

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

Electric field lines were introduced by:

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Faraday

Newton

Coulomb

Joule

At room temperature, electrons cannot escape the metal surface due to ………….. of atomic nucleus:

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Repulsive forces

Attractive forces

Gravitational forces

Electromagnetic forces

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

Which is used to investigate the properties of electron beam:

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LDR

Electroscope

Proton gun

Electron gun

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

The speed of sound in air is kmh^-1

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1243

1244

1245

1246

The equivalent resistance of a parallel combination is:

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Equal to sum of all resistance

Is greater than the largest resistance of combination

Is smaller than the smallest resistance of combination

All of these

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