Question # 1

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

Amorphous solids:

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Have definite melting points

Are called glassy solids

Have no definite melting point

Both (B) and (C)

Both (A) and (C)

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

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

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

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