Question # 1

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

The net charge on a capacitor magnitude of charge of charge

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Infinity

2 q

Q/2

Zero

1 tesla =

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1 MAm^-1

1NA^-1m

1NA^-1m^-1

None of above

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