Question Text
Question 1 :
The average temperature of the earth’s atmosphere is gradually increasing. What is it called?
Question 2 :
State True or False.
A brick kiln emits lot of smoke and other harmful gases causing air pollution.
Question 4 :
Is there a need to switch over to alternative fuels instead of the fossil fuels for our energy requirements, like solar energy, hydropower and wind energy?
Question 5 :
Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?
Question 7 :
Acid rain corroding the marble of the monument is called _____
Question 8 :
Smoke may contain ______ which combine with other air pollutants and fog to form smog.
Question 10 :
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called _____.
Question 11 :
CFCs damage the _____ layer of the atmosphere that protects us from harmful ultraviolet rays of the sun.
Question 12 :
Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is______.
Question 13 :
Which of the following procedures will give you water free from all impurities?
