Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?

Related Mcqs:

1. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?

   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 a correct explanation of A C. A is true but R is false D. A is false but R is true...

2. Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?

   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 a correct explanation of A C. A is true but R is false D. A is false but R is true...

3. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?

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

4. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?

   A. 20 cm B. 25 cm C. 40 cm D. 50 cm...

5. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?

   A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l...

6. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?

   A. 0.30 m/sec B. 0.35 m/sec C. 0.40 m/sec D. 0.45 m/sec...

7. The water carried sewerage system removes__________________?

   A. Domestic sewage B. Industrial sewage C. Storm sewage D. All the above...

8. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?

   A. Separate system B. Combined system C. Partially combined system D. None of these...

9. In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?

   A. Combined system B. Partially separate system C. Separate system D. None of these...

10. The most efficient cross-section of sewers in a combined sewerage system is________________?

    A. Parabolic B. Circular C. Rectangular D. New egged...