As compared to tap water the BOD of sewage polluted water shall be:

Related Mcqs:

1. BOD value of sewage water than that of tap water is:

   A. More
   B. Less
   C. Equal
   D. Somewhere more somewhere less

2. BOD of polluted water is increased by

   A. Algae
   B. Moss
   C. Ferns
   D. Distillated wastes

3. When excess of sewage is dumped in the river, its BOD:

   A. Increases
   B. Slightly decreases
   C. Remains unchanged
   D. Decreases drastically

4. With the increase in water pollution, the BOD:

   A. Decreases
   B. Increases
   C. Remains the same
   D. Is no measure of pollution

5. Which of the following enhances BOD of water?

   A. Algae
   B. Sand
   C. Moss
   D. Sugar mill effluents

6. In the polluted water, the values of:

   A. BOD much higher than COD
   B. BOD slightly higher than COD
   C. COD slightly higher than BOD
   D. COD much higher than BOD

7. Sewage drained into water bodies kills fishes because:

   A. It gives off a bad small
   B. It removes the food eaten by fishes
   C. It increases the competition with fishes for dissolved oxygen
   D. Excessive CO2 is added to water

8. Sewage water can be purified for recycling with the action of:

   A. Aquatic plants
   B. Penicillin
   C. Micro-organisms
   D. Fishes

9. BOD is connected with:

   A. Organic matter
   B. Microbes
   C. Both (a) & (b)
   D. None of these

10. In a river, if its BOD is high, then:

    A. River is polluted
    B. River is not polluted
    C. River is day
    D. None of these