Question # 1

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

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

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

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

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

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