_______ is a chemical substances which is mainly used in the construction of buildings.
Bricks
Cement
Plastics
PVC
Instead of _____ we can use things made of cloth, jute, coir and paper.
Water
Fibres
Silk
The important chemical substance used in the preparation of soap is ............
Sodium hydroxide
Sodium amalgum
Sodium silicate
Sodium bicarbonate
Which of the following is widely used in the manufacture of medical instruments?
Polyester
Glass
Cotton
The fibers like polyester, nylon and rayon are called
Synthetic fibers
Artificial fibers
Natural fibers
Cotton fibers
Identify the one which is not a natural fibre.
Wool
Jute