Advertisements
Advertisements
प्रश्न
Mention five causes of air pollution.
Advertisements
उत्तर
CAUSES OF AIR POLLUTION ARE:
- Burning of FOSSIL FUELS and FIBRES.
- Cutting of forests.
- An eruption of volcanoes.
- Increase in POPULATION.
- Agricultural activities like the use of chemical fertilisers, insecticides, pesticides, and burning of husks, etc.
APPEARS IN
संबंधित प्रश्न
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 observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Give a brief account of the discovery of air and the scientists involved.
Describe a simple experiment with the help of a diagram to show that Air is highly compressible
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Name a device which uses wind energy to generate electricity.
Which of the following statements is incorrect?
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.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
