Question # 1

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

Substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

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ECAT Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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