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प्रश्न
Name three different appliances where air is utilized.
टिप्पणी लिखिए
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उत्तर
- Vehicles – Run on tyres which are inflated with air.
- Brake mechanisms – Of trains and other machines, work on compressed air.
- Pumps and siphons – Work on air pressure
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संबंधित प्रश्न
Name the main components of air.
State three uses of water vapour in the air.
Tick (√) the most appropriate answer.
Symbiotic bacteria is not present in the nodules of :
Define the following:
Combustion.
State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Compare respiration and combustion-both involving oxygen of the air.
______ is necessary for all acids.
Tri oxygen molecule is known as ______.
Nitrogen is an essential element present in proteins and nucleic acids which are the building blocks of living things.
