Related Questions

__________ 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

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