Which of the following are thermoplastics ?I. Poly-vinyl chlorideII. Poly- styreneIII. PolytheneIV. Bakelite
I and II only
II and III only
I, II and III only
I, II and IV only
Silk is obtained from ____________ of the silk moth.
Pupa
Larva
Cocoon
Caterpillar
Commonly used synthetic fabrics areI. RayonII. NylonIII. PolyesterIV. Acrylic
All of these
Raw materials for most of the fabrics are obtained from
Earth
Sky
Petroleum
None of these
Which of the following are used to obtain fabrics ?
1.Weaving ii.Knitting iii.Setting iv.Serving
Wool is obtained from _______ of sheep.
Skin
Toes
Fleece
All of the above
Since plastics are not generally attacked by chemicals, so they are ideal substitutes for
wood
Metals
Glass
Select the one that is a natural fibre.
Cellulose
Nylon
Dacron
Terylene
The sorter's disease is caused by a bacteria:
Anthrax
Bacillus
Virus
Aedes
Select the material that is used to make ropes for use in rock climbing.
Nylon-6
Nylon-66
Rayon
Acrylic