Question # 1

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

The ability of a body to return to its original shape is called.

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Strain

Stress

Elasticity

Plasticity

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

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 unit of strain is:

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Nm

Nm^-2

no unit

Nm²

Young's modulus for water's is

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Zero

1

2

3

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

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 type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

The solids are classified as

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Polymeric

Amorphous

Crystalline

All of above

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

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

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