Question # 1

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

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

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Diamagnets

Paramagnets

Ferromagnets

All of these

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

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

A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

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

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

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

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 of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

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