Advertisements
Advertisements
Question
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Advertisements
Solution
| Desirable change | Undesirable change |
| (i) Changes brought about by nature or man which produces – useful or good results. | (i) Changes brought about by nature or man which produces – useless or bad results. |
| (ii) Positive and advantageous nature. | (ii) Negative and detrimental nature. |
| (iii) Examples of a desirable change: Rain bringing water to the crops, change of milk to curd, ripening of fruits seedling into a plant. |
(iii) Examples of an undesirable change: Rain causing destruction by floods, milk turning sour on a hot day, rotting of fruits, cutting of trees. |
APPEARS IN
RELATED QUESTIONS
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Select the chemical changes from the following list of changes
The carbon cycle.
Select the chemical changes from the following list of changes
Butter turning rancid
Stretching gold coin into a ring is a ______ change.
______ is the substance that is dissolved in a solvent.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
