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.

Silk is obtained from ____________ of the silk moth.

Commonly used synthetic fabrics are
I. Rayon
II. Nylon
III. Polyester
IV. Acrylic

Select the one that is a natural fibre.

During long distance travel you would like to take drinking water in a bottle made up of:

In present times, plastics  are used by majority of people because
I.  Plastics are quite cheap.
II. Plastics can be handled with ease.
III.Plastics are unbreakable.
IV.Plastics are light-weight.

Raw materials for most of the fabrics are obtained from

Acrylic fibres

Which of the following are thermoplastics ?
I. Poly-vinyl chloride
II. Poly- styrene
III. Polythene
IV. Bakelite

Which of the following is true for plastics ?