Iron & manganese present in the polluted water is removed by

1. Iron & manganese present in the polluted water is removed by
o chlorination only
o oxidation followed by settling & filtration I
o chemical coagulation
o simple filtration

Ans: B

Multiple Choice Questions on Environmental Engineering

1. Iron & manganese present in the polluted water is removed by

2. Presence of bacteria in potable (drinking) water causes

3. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

4. The amount of chemical coagulant added for treatment of polluted water ________ with increase in temperature of the polluted water to be treated 
5. Pick out the %Tong statement

6. Maximum permissible turbidity in potable water is _______ ppm

7. A shallow pond in which the sewage is retained and biologically treated is called

8. Ambient noise level can be reduced by _______ decibels by planting trees like coconut, neem etc.) near public utilit buildings (like hospitals & schools)

9. Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
10. Thermal pollution of water increases its toxicit and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _________ present in it