When plastic are burnt, they unit toxic gases which cause ____ problems.
Consuming
Constructing
Manufacturing
Respiratory
Which kind of clothes do you prefer in summer?
Nylon
Wool
Silk
Cotton
The important chemical substance used in the preparation of soap is ............
Sodium hydroxide
Sodium amalgum
Sodium silicate
Sodium bicarbonate
Water bottles are made up of
Polythene
Styrene
PVC
Bakelite
The clothes which are made from the fur of the animals.
Woollen
___________ is obtained from silk worms.
Cotton fibers
Silk fibers
Synthetic fibers
Cellulose
________ threads are used to make cloths.
Fibre
Plastic
Synthetic fibre
The fibers like polyester, nylon and rayon are called
Artificial fibers
Natural fibers