When a woolen yarn is knitted to get a sweater, the change can be classified as _______ .

(a)

physical change

(b)

chemical change

(c)

endothermic change

(d)

exothermic change

______ of the following are endothermic changes.

(a)

Condensation and melting

(b)

Condensation and freezing

(c)

Evaporation and melting

(d)

Evaporation and freezing

The chemical change is _______.

(a)

water to clouds

(b)

growth of a tree

(c)

cow dung to bio-gas.

(d)

ice-cream to molten ice-cream.

________is an example of a periodic change.

(a)

Earthquake

(b)

Formation of rainbow in sky

(c)

Occurrence of tides in seas

(d)

Showering of rain

_________ is not a chemical change.

(a)

Dissolution of ammonia in water

(b)

Dissolution of carbon-di-oxide in water

(c)

Dissolution of oxygen in water

(d)

Melting of polar ice caps