Advertisements
Advertisements
प्रश्न
The components of air which are harmful to living beings are ______.
पर्याय
nitrogen and carbon dioxide.
dust and water vapour.
dust and smoke.
smoke and water vapour.
Advertisements
उत्तर
The components of air which are harmful to living beings are dust and smoke.
Explanation:
Dust and smoke are harmful to living beings because if they enter our body, they can cause respiratory problems.
APPEARS IN
संबंधित प्रश्न
Fill in the blanks :
_______ and ______ are the most common air pollutants.
Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Dust particles help in the ________ of water vapour in air.
Tick (√) the most appropriate answer.
Which is not a polluting gas for the air?
Give the chemical name of rust.
Fill in the blank
The supporter of combustion in air is _____.
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
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 |
Classify the following.
( Dog, Cat, coconut tree, monkey, brinjal plant, papaya plant)
| Things which give out oxygen | Things which give out carbon dioxide |
Give the components present in the air with a percentage?
Mountaineers carry oxygen cylinders with them because ______.
