Samacheer Kalvi 7 Changes Around Us Class 7 Questions - 1

Question: 1

_____ is not a chemical change.

(A) Melting of polar ice caps

(B) Dissolution of oxygen in water

(C) Dissolution of carbon dioxide in water

(D) Dissolution of ammonia in water

Question: 2

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

(A) Endothermic change

(B) Exothermic change

(C) Physical change

(D) Chemical change

Question: 3

_____ is an example of a periodic change.

(A) Showering of rain

(B) Earthquake

(C) Formation of rainbow in sky

(D) Occurrence of tides in seas

Question: 4

The chemical change is

(A) Cow dung to bio-gas

(B) Ice-cream to molten ice cream

(C) Growth of tree

(D) Water to clouds

Question: 5

_____ of the following are endothermic changes.

(A) Evaporation and freezing

(B) Evaporation and melting

(C) Condensation and freezing

(D) Condensation and melting