Environmental Science and Engineering
GATE ES exam:gate PYQs
Build your understanding with focused practice from past exam papers.
Questions 181–190 of 390. Imported answers require independent review unless marked reviewed.
Question 51
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The ionic strength of a solution containing 0.01M of CaCl₂ and 0.001M of Na₂SO₄ is ______ M (rounded off to 3 decimal places).
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The concentration of Ozone corresponding to a mixing ratio of 120 ppb at pressure of 1 atmosphere and temperature of 25°C is ______ μg/m³ (rounded off to 1 decimal place).
Atomic weight of oxygen = 16; R= 8.314 J/K-g.mole.
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One million liters per day (MLD) of wastewater with a soluble BOD of 200 mg/L is treated in an activated sludge process. The BOD of treated wastewater is 20 mg/L. The observed yield coefficient of the biological system is 0.35.
The daily biomass generation in the system is ______ kg (an integer value).
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An industry discharges 2 million liters per day (MLD) of wastewater with a temperature of 45°C and a pH of 2, whereas the neighboring industry produces 3 MLD of wastewater with a temperature of 30°C and pH of 8. If both the wastewaters are mixed and carried through a pipeline, then the resultant pH of mixed wastewater is ______ (rounded off to 2 decimal places).
Neglect buffering capacity of the system and the temperature effect on pH.
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Consider a watershed and isohyets as shown in the figure. The average rainfall in the watershed is ______ mm (an integer value).
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With reference to the gate shown in the figure, the gate will start opening automatically when the water level ‘h’ above the hinge is ______ m (rounded off to 2 decimal places).
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In a cyclone separator of radius 25 cm, a particle is traveling with a gas stream at velocity of 18 m/s. The ratio of centrifugal force to the gravitational force acting on the particle is ______ (rounded off to 2 decimal places). Consider acceleration due to gravity (g) as 9.8 m/s
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Two sources of noise, adjacent to each other in a room, have sound pressure levels of 30 and 40 decibel (dB). The combined sound pressure level in the room is ______ dB (rounded off to 2 decimal places). Use reference sound pressure as 20 μPa.
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An industrial stack emits 100 g/s of CO at an effective height of ‘H’, where the wind speed is 5 m/s. At 3 km distance downwind, the values of dispersion coefficient in y-direction and z-direction are 50 m and 25 m, respectively. The CO concentration at the centerline of the plume at 3 km distance downwind is ______ mg/m
(rounded off to 2 decimal places)? Use Gaussian plume model and value of π = 3.14. Neglect reactions and the ground effect of plume in the calculations.Log in to check the answer
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Two hypothetical organic waste streams A and B are mixed prior to the composting process. Waste-A has 2.16% of C and 1.20% of N. Waste-B has 19.10% of C and 0.14% of N. The quantity of Waste-B that should be mixed with per kg of Waste-A to achieve the desired C:N ratio of 25 is ______ kg (rounded off to 2 decimal places). Assume both the waste streams are completely dry.
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