Question 4 :
Gases like methane, nitrous oxide and water vapour also contribute towards greenhouse effect, they are also called ___________.
Question 5 :
<span>Rain, snow or fog which is acidic in nature, is known as:</span>
Question 6 :
<p>Sterilization of water by addition of chlorine for treatment against bacterial infection is known as:</p>
Question 8 :
When harmful substances such as sewage, toxic chemicals get mixed with water, then:
Question 9 :
Which of the following is correct about the percentage composition of $O_2$ in air?
Question 10 :
Water that is purified and fit for drinking is known as:
Question 13 :
The correct ascending order of gases as per their composition in air is:
Question 14 :
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is
Question 15 :
Which of the following gas is responsible for green house effect?
Question 17 :
Which of the following is not a feature of potable water?
Question 20 :
Carbon dioxide, argon, methane, ozone and water vapour are also present in  air in:
Question 21 :
Which of the following is the main factor of water pollution?
Question 23 :
The gas released during anaerobic degradation of vegetation may lead to:
Question 24 :
Which among the given is not a natural source of air pollution?
Question 25 :
Assertion (A): Acid rain reduces the fertility of the soil.<br/>Reason (R): Acid rain has a corroding effect on marble buildings.<br/>