__________ moulding process can not be used for thermoplastic plastics.

__________ moulding is used for shaping of thermosetting plastics exclusively.

A

Compression

B

Injection

C

Transfer

D

Extrusion

Polystyrene is a light, transparent, thermoplastic material used for making

A

Toys and combs

B

Packaging bags

C

Non-sticking utensils

D

Electrical insulation

Which of the following is not a thermoplastic material?

A

Epoxy polymer

B

PVC

C

Polystyrene

D

Polythene

Which of the following is a thermoplastic?

A

Polystyrene

B

Ethylene

C

Propylene

D

Ortho Xylene

Thermoplastic materials are those materials which

A

Do not become hard with the application of heat and pressure and no chemical change occurs

B

Are flexible and can withstand considerable wear under suitable conditions

C

Are formed into shape under heat and pressure and results in a permanently hard product

D

Are used as a friction lining for clutches and brakes

Thermoplastic materials

A

Do not soften on application of heat

B

Are heavily branched molecules

C

Are solvent insoluble

D

None of these

Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

A

Molecular sizes

B

Magnitude of intermolecular forces

C

Resistance to heat

D

Polymerisation mechanism

Thermosetting resins/polymers as compared to thermoplastic ones are

A

Soluble in all organic solvents

B

More brittle

C

Formed by addition polymerisation only

D

Easily reshaped & reused

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

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

__________ moulding process can not be used for thermoplastic plastics.

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