Question # 1

In Helium Neon laser, the discharge tube is filled with

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80% He, 20% Neon

85% He, 15% Neon

83% He, 17% Neon

90% He, 10% Neon

For workers in nuclear facilities is, a weekly does of is normally considered safe

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1.0 msv

5.0 msv

2.0 msv

3.0 msv

Three resistors of resistance R each are combined in various ways, Which of the following cannot be obtained?

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

Subatomic particles are divided into groups.

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Photon

Laptons

Hadrons

All of these

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

Domains are existed in

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Ferromagnetic materials

Paramagnetic materials

Semi conductors

Diamagnetic materials

Charge carriers in electrolytes are.

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Protons

Electrons

Holes

Positive and Negative ions

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

Those materials whose resistivity becomes zero at certain temperature is called:

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Semiconductor

Super conductor

Conductor

Insulator

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

Kirchhoff's voltage rule is a way of stating conservation of.

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Mass

Charge

Energy

Momentum

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

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Speed

Kinetic energy

Path of motion

angular velocity

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at

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900^oC

600^oC

800^oC

100^oC

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

The electric intensity due to two oppositely charged plates is

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None of these

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