Question # 1

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

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

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

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

The solids are classified as

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Polymeric

Amorphous

Crystalline

All of above

The first superconductor was discovered in:

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1831

1911

1921

1876

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 SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

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

Which one is not a crystalline solid.

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Zinc

Copper

Nylon

None of these

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

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

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