Advertisements
Advertisements
प्रश्न
What do you understand by the term polluted air?
Advertisements
उत्तर
When the air contains harmful or undesirable substances, generated by the activities of man or nature, such that their concentration interferes with human health or is injurious to plants or animals, it is said to be polluted air.
APPEARS IN
संबंधित प्रश्न
What is nitrogen-fixation?
Write ‘True’ or ‘False’ in front of following statement.
Water containing dissolved carbon dioxide can dissolve marble.
Statement given below is incorrect. Write the correct statement :
Potassium nitrate on strong heating decomposes into potassium nitrite and nitrogen gas.
Compare the three main components of air i.e. nitrogen, oxygen and carbon dioxide with reference to their density and solubility, nature and reactivity.
Name the main component of air.
Inhaled air contains a large amount of carbon-di-oxide.
What is the composition of air?
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.
A weather cock shows the ______ in which the air is moving at that place.
Observe the picture given in Fig. carefully and answer the following questions.
Why is he putting a cover on his nose?
