acrylic
polyester
nylon 6:6
polypropylene
✅ The correct answer is option A.
Chemical Engineering MCQs
Molecular weights of plastics ranges from
1000 to 5000
5000 to 1000
20000 to 25000
109 to l011
✅ The correct answer is option C.
Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?
50000
51600
49200
50800
✅ The correct answer is option A.
A large iceberg melts at the base, but not at the top, because of the reason that
A. Ice at the base contains impurities which lowers its melting point
B. Due to the high pressure at the base, its melting point reduces
C. The iceberg remains in a warmer condition at the base
D. All of the above
✅ The correct answer is option B.
Work done may be calculated by the expression ∫p dA for __________ processes.
A. Non-flow reversible
B. Adiabatic
C. Both A and B
D. Neither A nor B
✅ The correct answer is option C.
Refrigeration cycle
A. Violates second law of thermodynamics
B. Involves transfer of heat from low temperature to high temperature
C. Both A and B
D. Neither A nor B
✅ The correct answer is option B.
The expression for entropy change given by, ΔS = nR ln (V₂/V₁) + nCv ln (T₂/T₁) is valid for
A. Reversible isothermal volume change
B. Heating of a substance
C. Cooling of a substance
D. Simultaneous heating and expansion of an ideal gas
✅ The correct answer is option D.
A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.
A. 2.73
B. 28.3
C. 273
D. 283
✅ The correct answer is option B.
Which of the following is an inorganic polymer ?
Teflon
Perspex
Silicones
Bakelite
✅ The correct answer is option C.
Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ?
Water impermeable cellophane
Polythene
Cellulose acetate
Teflon
✅ The correct answer is option B.