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प्रश्न
What are man-made changes ?
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उत्तर
Man-made changes are those that occur because of human activities e.g. changing the direction of flow of a river by building a dam.
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संबंधित प्रश्न
Fill in the blank.
An earthquake is a .................. change.
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Define physical change. Give two examples for the above changes.
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Cutting of paper into pieces is a chemical change.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
