Question # 1

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

For which material medium, force between two charged particles is maximum.

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Ammonia

Germanium

Mica

Teflon

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The charge on Beta particle is

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+e

-e

-2e

None of these

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

In the equation if f₂ > then

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There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

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