1. The velocity of flow does not depend on
2. The slope of sewer shall be
3. The overflow rate for plain sedimentation tanks is about
4. The main disadvantage of cement concrete sewers is
5. Which of the following compounds is widely used for algae control?
6. Select the correct statement.
7. The devices which are installed for drawing water from the sources are called
8. The treatment of water with bleaching powder is known as
9. As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
10. The disinfection efficiency of chlorine increases by
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water
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