Related Questions

__________ moulding process can not be used for thermoplastic plastics.
A Compression
B Extrusion
C Injection
D None of these
__________ is a thermosetting plastic.
A Polyvinyl chloride
B Polythene
C Bakelite
D Teflon
Most of the plastics are safe to be used upto a maximum temperature of __________ °C.
A 100
B 150
C 350
D 450
Which of the following is a thermosetting polymer?
A PVC
B PTFE
C Nylon
D Polyesters
Which of the following is an example of thermosetting plastic?
A Bakelite
B PVC
C Polyethylene
D No option is correct.
The thermosetting plastic
A Becomes rigid when moulded at suitable pressure and temperature
B At 127°C to 177°C permanently set and further application of heat does not soften it
C Chars at 343°C
D All the above
Thermosetting materials
A Are cross-linked molecules
B Soften on application of heat
C Are solvent soluble
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

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