Question # 1

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

When the medium is insulator the elecrostatic force between the charges is

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Decreased

Zero

Increased

None of above

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

For a current carrying solenoid the term 'n' has unit as.

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No unit

m^-1

m^-2

m-3

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

The electric intensity due to two oppositely charged plates is

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None of these

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

If there is no fourth band, tolerance is shows as

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10%

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

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