Question # 1

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

Curie temperature is a point where :

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Diamagnetism changes to paramagnetism

Paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

Paramagnetism changes to Ferromagnetism

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

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

Substance which break just after the elastic limit is reached are called as.

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Ductile substances

Hard substances

Britto substances

Soft substances

The SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

Young's modulus for water's is

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Zero

1

2

3

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