Changes Around Us

Change of seasons is-
1. fast change
2. slow change
3. reversible change
4. irreversible change
Changes which can be reversed are known as-
1. reversible change
2. irrversible change
3. fast change
4. slow change
Digestion of food is-
1. undesirable change
2. desirable change
3. irreversible change
4. both b and c
No new substances are formed in-
1. chemical change
2. irreversible change
3. desirable change
4. physical change
The spreading of solid particles among the liquid molecules is called
1. dissolvation
2. desolvation
3. dissolution
4. mixing
Blackening of silver ornaments is-
1. physical change
2. chemical change
3. desirable change
4. fast change
An example of desirable change is-
1. Cooking of food
2. rusting of iron
3. rain
4. both a and c
Cultivation of crop is-
1. natural change
2. artificial change
3. undesirable change
4. none of these
When ice melts to form water, change occurs in its
1. position
2. colour
3. state
4. composition
Drying of wet clothes in air is an example of
1. chemical change
2. undesirable change
3. irreversible change
4. physical change
Out of the following an example of desirable change is-
1. rusting
2. change of seasons
3. earthquake
4. flooding
Air pollution leading to acid rain is a
1. reversible change
2. fast change
3. natural change
4. human made change