Related Questions

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
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
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
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
__________ moulding process can not be used for thermoplastic plastics.
A Compression
B Extrusion
C Injection
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 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
Polystyrene is a light, transparent, thermoplastic material used for making
A Toys and combs
B Packaging bags
C Non-sticking utensils
D Electrical insulation

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