Question # 1

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

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

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

The conductors having the conductivity of the order of

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The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

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 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

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

The number of crystal system are

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Three

Five

Seven

Fifteen

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