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GATE2020 Environmental Engineering Rapid Quiz 1 (App update required to attempt this test)

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Question 1

Which of the following statement(s) is (are) correct?
1) Maximum daily consumption is more than the maximum hourly consumption.
2) The term absolute maximum hourly demand is used to indicate the consumption of maximum hour on maximum day of maximum month of maximum reason.
3) Maximum monthly consumption is more than maximum seasonal consumption

Question 2

At a water treatment plant, 8 million litres of water is treated daily, using alum dosage of 20 mg per litres. The total quantity of alum used is ______ kg.

Question 3

In the figures, Group I represents the atmospheric temperature profiles (P, Q, R and S) and Group II represents dispersion of pollutants from a smoke stack (1, 2, 3 and 4). In the figures of Group I, the dashed line represents the dry adiabatic lapse rate, whereas the horizontal axis represents temperature and the vertical axis represents the altitude.

The correct match is

Question 4

An average operating data for conventional activated sludge treatment plant is as follows:
Influent BOD (So) = 200 mg/l
Effluent BOD(S) = 25 mg/l
MLSS(X) =3000 mg/l
Effluent suspended solids (Xe) = 40 mg/l
Waste sludge suspended solids (Xr) = 12000 mg/l
Wastewater flow (Q) = 50000 m3/day
Quantity of waste sludge (Qw) = 250 m3/day
Aeration period = 0.31 days
Find the sludge age in days

Question 5

During a BOD test conducted on 5% dilution of wastewater, following observations were taken:
Dissolved oxygen of aerated water used for dilution = 3.6 mg/l
Dissolved oxygen of original wastewater sample = 0.8 mg/l
Dissolved oxygen of diluted sample after 5 days of incubation= 0.7 mg/l
What is the 5 day BOD of sample

Question 6

The spherical grit particles, having a radius of 0.01mm and specific gravity of 3.0, need to beseparated in a settling chamber. It is given that

∙ the density of the liquid in the settling chamber =
∙ the kinematic viscosity of the liquid in the settling chamber
Assuming laminar conditions, the settling velocity (in mm/s, up to one decimal place) is_____
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Dec 26ESE & GATE CE