The maximum efficiency of BOD removal is achieved in______________?

Related Mcqs:

1. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?

   A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm...

2. The ratio of 5 day BOD to ultimate BOD is about_______________?

   A. 1/3 B. 2/3 C. 3/4 D. 1.0...

3. If Biochemical oxygen demand (BOD. of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is_________________?

   A. 1000 B. 4000 C. 100000 D. 400000...

4. Standard BOD is measured at________________?

   A. 20°C – 1day B. 25°C- 3day C. 20°C – 5day D. 30°C- 5day...

5. The rate of BOD exerted at any time is_____________?

   A. directly proportional to BOD satisfied B. directly proportional to BOD remain-ing C. inversely proportional to BOD satisfied D. inversely proportional to BOD re-maining...

6. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?

   A. 1 B. 100 C. infinite D. zero...

7. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?

   A. TOD>BOD>COD B. TOD>COD>BOD C. BOD>COD>TOD D. COD>BOD>TOD...

8. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?

   A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not the correct explanation of A C. A is true but R is false D. A is false but R is true...

9. Disinfection of water results in______________?

   A. removal of turbidity B. removal of hardness C. killing of disease bacteria D. complete sterilisation...

10. For a given discharge, the efficiency of sedimentation tank can be increased by______________?

    A. increasing the depth of tank B. decreasing the depth of tank C. increasing the surface area of tank D. decreasing the surface area of tank...