Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

A

Low impact strength

B

High flexibility

C

Better finish and surface appearance

D

High plastic deformation

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

A

Decrease in effect

B

Increase in thrust

C

Develops noise

D

Develops high pressure

Celluloid is

A

Cellulose acetate

B

Regenerated cellulose

C

Cellulose nitrate

D

Cellulose acetate butyrate

Celluloid is chemically

A

Cellulose acetate

B

Regenerated cellulose

C

Cellulose nitrate

D

Cellulose acetate butyrate

Thermosetting polymers as compared to thermoplastic polymers

A

Are formed by addition polymerisation

B

Have three dimensional structure

C

Have linear structure

D

None of these

Branched chair polymers as compared to linear polymers have

A

Higher melting point

B

Higher tensile strength

C

Lower density

D

None of these

In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher

A

Densities

B

Melting point

C

Tensile strength

D

Hardness, rigidity & brittleness

Branched chain polymers compared to linear polymers have higher

A

Density

B

Tensile strength

C

Melting point

D

Degree of irregularity in atomic packing

The undesirable property of a refrigerant is

A

Non-toxic

B

Non-flammable

C

Non-explosive

D

High boiling point

Which of the following is an undesirable property in a tower packing?

A

Large surface per unit volume

B

Large free cross-section

C

Low weight per unit volume

D

Large weight of liquid retained

Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

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