A. 5 day BOD is the ultimate BOD
B. 5 day BOD is greater than 4 day BOD keeping other conditions same
C. 5 day BOD is less than 4 day BOD keeping other conditions same
D. BOD does nof depend on time
Related Mcqs:
- Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?
A. N = y + R
B. y = N + R
C. R = N + y
D. R > (N + y) - 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 - Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to 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 - 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 - The distribution mains are designed for________________?
A. maximum daily demand
B. maximum hourly demand
C. average daily demand
D. maximum hourly demand on maxi¬mum day - In water treatment, rapid gravity filters are adopted to remove_______________?
A. dissolved organic substances
B. dissolved solids and dissolved gases
C. floating solids and dissolved inorganic solids
D. bacteria and colloidal solids - The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
A. grid iron system
B. dead end system
C. ring system
D. radial system - 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 - 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 - Cleaning is done by________________?
1) scraping and removal in filters slow sand
2) back washing in slow sand filters
3) scraping and removal in filters rapid sand
4) back washing in rapid sand filters
The correct answer isA. (1) and (2)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4)
