A. 10
B. 20
C. 50
D. 85
Related Mcqs:
- Cellulose is the main constituent of most ______________ fibres?
A. Acrylic
B. Spandex
C. Synthetic
D. Natural - Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?
A. Improving the stretchability
B. Dyeing/colouring
C. Detergent solution washing
D. Glycol soaking - 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 - 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%) ?
A. Water impermeable cellophane
B. Polythene
C. Cellulose acetate
D. Teflon - Orlan fibre which is used as a wool substitute is __________________?
A. An amorphous polymer
B. A natural polymeric fibre
C. Polyacrylonitrile
D. Poly-methyl-methacrylate (PMMA) - Rayon is a ____________ fibre?
A. Cellulosic
B. Polyamide
C. Polyester
D. Natural - 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
Answer: Option B - Polycaprolactam (Nylon – 6) is produced by the condensation polymerisation of caprolactam at 240-280°C in which the conversion of caprolactam is about ______________ percent?
A. 50
B. 75
C. 90
D. 99 - The conversion of caprolactam in the above case is about ____________ percent?
A. 25
B. 50
C. 70
D. 90 - Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of _______________ percent?
A. 1-1000
B. 1000-1500
C. 1500-2000
D. 2000-2500
