Top 250+ Solved Waste Water Treatment MCQ Questions Answer
Q. What are the byproducts of the breakdown of the organic compounds by UV rays?
a. CO
b. CO2 + H2O
c. H2CO3 and water
d. CO + H2O
Q. In what range is the EE/O present in order to reduce one log of reduction?
a. 0-20 KWH
b. 20-265 KWH
c. 265-365 KWH
d. 365-650 KWH
Q. Primary sludge includes __________
a. Total suspended solids
b. Suspended solids
c. Removable solids
d. Settleable solids
Q. Which of the following methods are used in rural communities?
a. Aerobic digestion
b. Mechanical dewatering
c. Dewatering
d. Composting
Q. From which of the following methods can toxic chemicals be removed?
a. Sorption
b. Adsorption
c. Absorption
d. Dewatering
Q. What is the first step in the sewage treatment process?
a. Dewatering
b. Thickening
c. Phosphorus recovery
d. Digestion?
Q. What is the amount of solids released into wastewater by human beings?
a. 30 gpcd
b. 40 gpcd
c. 60 gpcd
d. 70 gpcd
Q. What is the percentage of aerobically digested sludge?
a. 0.2-0.5
b. 0.3-0.6
c. 1.0-2.0
d. 1.5-3.0
Q. Ws = Wsp + WssWhat does Wsp stand for in the above equation?
a. Total dry solids
b. Raw primary solids
c. Suspended solids
d. none
Q. Sludge from the primary clarifier is ______
a. Brown and flocculant like appearance
b. Dark in colour
c. Gray and slimy
d. Dark brown in colour
Q. How does the chemical sludge appear?
a. Gray in colour and not slimy
b. Brown and flocculant like appearance
c. Red/grayish brown
d. Black in colour
Q. How does the activated sludge appear?
a. Gray
b. Red
c. Brown and flocculant like appearance
d. Greasy
Q. What is the % of dry solids assumed for a primary sludge from a settling tank at the outlet?
a. 12%
b. 5-7%
c. 8%
d. 9-11%