Which of the following are correct about plastics ?I. They are toxic to aquatic life when placed in water.II. They are non-biodegradable.III. They cause air-pollution as on burning they produce toxic gases.IV. They can be easily decomposed by micro-organisms.
I and II only
II and III only
I, II and III only
I, II and IV only
Which of the following are correct about acrylic?I. It is synthetic fibre that resembles wool.II. It is also called lycra.III.It is also known as orlonIV.It is used in making T-shirts and caps.
I and III only
II and IV only
Which of the following properties are possessed by synthetic fibres ?I. They have low tensile strength.II. They show the property of elasticity.III.They do not wrinkle.
All of the above.
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
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
Silk is obtained from ____________ of the silk moth.
Pupa
Larva
Cocoon
Caterpillar
Which of the following are thermoplastics ?I. Poly-vinyl chlorideII. Poly- styreneIII. PolytheneIV. Bakelite
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
