Choose the correct answer.
1. When a woolen yarn is knitted to get a sweater, the change can be described as
a) Physical change
b) Chemical change
c) Endothermic reaction
d) Exothermic reaction
2. The chemical chancre among the following is ______
a) Water to clouds
b) GroWth of a tree
c) Cow dung to bio gas
d) Ice to water
3. Which is an example of a periodic change?
a) Earth quake
b) Formation of rainbow
c) Occurrence of tides in sea
d) Showering of rain
4. Photosynthesis by green plant is a
a) Physical change
b) Chemical change
c) Reversible change
d) None of the above
