Advertisements
Advertisements
प्रश्न
State what do you understand by the term ‘air’. Explain its importance to mankind.
Advertisements
उत्तर
Air is a mixture whose composition varies at different intervals of time and different places of the world. Man cannot survive without air and water and hence the air is very essential for survival.
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 |
Define rusting?
Name two air pollutants which cause acid rain.
State four steps to be taken to control air pollution.
Name three greenhouse gases.
Tick (√) the correct alternative from the choice given for the following statement.
The substance which accelerates the speed of a reaction without itself undergoing any change is called
Describe a simple experiment with the help of a diagram to show that Air exerts pressure
What will happen if the number of vehicles and factories in your surroundings increases?
Draw a neat labelled diagram for the following experiment.
To demonstrate the burning of sulphur in a jar of oxygen.
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?
