Question # 1

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

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

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2

1

0

0.5

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

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 most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

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

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

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

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Silver

Lead

Germanium

Polythene

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

In extrinsic semiconductors doping is of the order of.

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1 atom to 10⁴

1 atom to 10⁶

1 atom to 10⁸

1 atom to 10³

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b

The conductors having the conductivity of the order of

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Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

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

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Semiconductor

Super conductor

Conductor

Insulator

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