4711. Which of the following is not a thermoplastic material ?
Epoxy polymer
PVC
Polystyrene
Polythene
✅ The correct answer is option A.
Chemical Engineering
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4712. Polythene is a/an
addition polymerisation product.
condensation polymerisation product.
thermosetting material.
none of these.
✅ The correct answer is option A.
4713. Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?
Butyl rubber
Silicon rubber
Nitrile rubber
Silicone rubber
✅ The correct answer is option D.
4714. Gibbs free energy per mole for a pure substance is equal to the
A. Latent heat of vaporisation
B. Chemical potential
C. Molal boiling point
D. Heat capacity
✅ The correct answer is option B.
4715. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
1:03
3:01
1:02
2:01
✅ The correct answer is option A.
4716. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of
cross linked polystyrene.
phenol formaldehyde resins.
polyesters.
polyamides.
✅ The correct answer is option A.
4717. High __________ is an undesirable property for a good refrigerant.
A. Specific heat
B. Latent heat of vaporisation
C. Viscosity
D. Specific vapor volume
✅ The correct answer is option C.
4718. Zeigler process
produces high density polythene.
uses no catalyst.
produces low density polythene.
employs very high pressure.
✅ The correct answer is option A.
4719. As the time is passing, entropy of the universe
A. Is increasing
B. Is decreasing
C. Remains constant
D. Data insufficient, can’t be predicted
✅ The correct answer is option A.
4720. Enthalpy changes over a constant pressure path are always zero for __________ gas.
A. Any
B. A perfect
C. An easily liquefiable
D. A real
✅ The correct answer is option B.