Environmental Science and Engineering
2024 · Paper 1
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Complete GATE ES 2024 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.
Question 58
Open questionESNAT2 marksNeeds review
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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Open questionESNAT2 marksNeeds review
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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Open questionESNAT2 marksNeeds review
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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