Raw materials for most of the fabrics are obtained from
Earth
Sky
Petroleum
None of these
In present times, plastics are used by majority of people becauseI. Plastics are quite cheap.II. Plastics can be handled with ease.III.Plastics are unbreakable.IV.Plastics are light-weight.
I and II only
II and III only
I, II, and III only
I, II and IV only
Which of the following are thermoplastics ?I. Poly-vinyl chlorideII. Poly- styreneIII. PolytheneIV. Bakelite
I, II and III only
Which of the following are used to obtain fabrics ?
1.Weaving ii.Knitting iii.Setting iv.Serving
To which of the following 4R principle apply most?
Synthetic fibre
Natural fibre
Metals
Plastic
Commonly used synthetic fabrics areI. RayonII. NylonIII. PolyesterIV. Acrylic
All of these
Select the material that is used to make ropes for use in rock climbing.
Nylon-6
Nylon-66
Rayon
Acrylic
Acrylic fibres
Are a substitute for natural wool.
Decompose with melting.
Are not crimpy.
All the above are correct.
Which of the following is true?
Fabrics made of polyesters and nylons are heat set
Plastics are synthetic materials that can't be moulded into permanent shape
Natural fibres are hydrophobic
Synthetic fibres do not accumulate electric charge on them
Which of the following is true for plastics ?
Like synthetic fibres, plastics are also polymers.
Thermo-plastics are harder and stronger than thermosetting plastics.
Bakelite is a thermoplastic.
None of the above
