Related Questions

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
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
A Nylon
B Polyacrylonitrile
C Polypropylene
D Polyester
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
In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?
A Tin
B Lead
C Zinc
D Glass
Thermoplastic resins are those polymers, which
A Has decreased plasticity at increasing temperature
B Can not be moulded
C Easily deform under pressure at high temperature
D None of these
Thermosetting resins are those polymers, which
A Do not increase in plasticity with rise in temperature
B Allow slip to occur between molecules
C Do not take on a permanent set
D None of these
Thermosetting polymers are
A Injection moulded
B Cast molded
C Extruded
D None of these
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

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