Question Text
Question 1 :
Why should oils and fats be not released in the drain? Explain.
Question 3 :
The General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on __________.
Question 7 :
Study the following statements about ozone:
a. It is essential for breathing of living organisms.
b. It is used to disinfect water.
c. It absorbs ultraviolet rays.
d. Its proportion in air is about 3%.
Which of these statements are correct?
Question 14 :
A skimmer removes the floatable solids like oil and grease. Water so cleared is called _________?
Question 18 :
Explain why sewage is harmful to discharge untreated sewage into rivers or seas?
Question 19 :
What are the ways to minimise or eliminate waste and pollutants at their source?
Question 20 :
A network of big and small pipes that are used to take away the wastewater, called _____, forming the _______?
Question 21 :
The General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on “Water for life” on _________.
Question 22 :
Who had said “No one need to wait for anyone else to adopt a humane and enlightened course of action.”?
Question 24 :
In the year 2016, the Government of India has initiated a new mission known as___________.
Question 29 :
Explain the function of bar screens in a wastewater treatment plant.