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प्रश्न
Tick (√) the most appropriate answer.
The humans pollute the air by :
पर्याय
burning a vast amount of coal
burning waste materials
using petrol and diesel vehicles
all the above
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उत्तर
all the above
APPEARS IN
संबंधित प्रश्न
Tick (√) the most appropriate answer.
Which is not a polluting gas for the air?
What are the two necessary conditions for rusting of iron?
Nitrogen is used in the food packaging industry because it _____.
The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
List out the uses of nitrogen.
______ gas cylinders are used for breathing purpose for a diver going deep into the sea.
Mountaineers carry oxygen cylinders with them because ______.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
Mountaineers carry oxygen ______ with them, while climbing high mountains.
Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it so happened?
Explain the following observations very briefly
Breathing through mouth may harm you.
