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प्रश्न
What will happen if the number of vehicles and factories in your surroundings increases?
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उत्तर
Vehicles and factories are the major sources of air pollution. If the number of vehicles and factories increases in our surroundings, it is obvious that it would result in increased levels of air pollution. Not only air pollution but they also result in noise pollution. In case the number of industries increases in our surroundings, it means more trees would have to be cut down to make way for them, thus resulting in damage to the environment.
संबंधित प्रश्न
How is greenhouse effect produced?
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Give two uses of the following component present in air:
carbon dioxide
Name two air pollutants which cause acid rain.
Write ‘true’ or ‘false for the following;
Air is a compound.
Draw a neat labelled diagram for the following experiment.
To prove that oxygen is non-combustible, but supports combustion.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
The ______ makes the windmill rotate.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
