Orthotolidine test is used for determination of________________?

Related Mcqs:

1. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

   A. 1 mg/litre
   B. 10 mg/litre
   C. 100 mg/litre
   D. 1000 mg/litre

2. Laying of sewers is usually done with the help of________________?

   A. a theodolite
   B. a compass
   C. sight rails and boning rods
   D. a plane table

3. The process of lagooning is primarily a means of________________?

   A. reducing the excessive flow in sewers
   B. disposing of sludge
   C. increasing the capacity of storage re-servoirs
   D. increasing flow of sewage through imhoff tanks

4. 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

5. If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?

   1) presumptive coliform test
   2) confirmed coliform test
   3) completed coliform test
   The correct answer is ?

   A. only (1)
   B. both (1) and (2)
   C. both (1) and (3)
   D. all (1), (2) and (3)

6. The polluted water is one which_______________?

   A. contains pathogenic bacteria
   B. consists of undesirable substances rendering it unfit for drinking and domestic use
   C. is safe and suitable for drinking and domestic use
   D. is contaminated

7. Chlorine demand of water is equal to________________?

   A. applied chlorine
   B. residual chlorine
   C. sum of applied and residual chlorine
   D. difference of applied and residual chlorine

8. Sewerage system is designed for_______________?

   A. maximum flow only
   B. minimum flow only
   C. average flow only
   D. maximum and minimum flow

9. The characteristics of fresh and septic sewage respectively are____________________?

   A. acidic and alkaline
   B. alkaline and acidic
   C. both acidic
   D. both alkaline

10. The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?

    A. 50 to 60
    B. 100 to 150
    C. 500 to 600
    D. 1400 to 1500