Mining Engineering
GATE MN topic:surface-environment PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–20 of 26. Imported answers require independent review unless marked reviewed.
Question 35
Open questionMNNAT1 markNeeds review
At a measurement station, the air quality parameters PM₂.₅, NO₂ and O₃ have the AQI sub-index values as 180, 96, and 84, respectively. The AQI for the station is ______. (in integer)
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Open questionMNNAT2 marksNeeds review
A city is spread over an area of 20 km × 40 km. Wind, at an average speed of 4 m/s, enters perpendicular to the 20 km long side. On a winter day the inversion layer exists over the city at a height of 100 m. PM₁ is emitted from the city at a rate of 1 kg/s. The steady state PM₁ concentration in the city air, in μg/m³, assuming Box model, is ______. (round off to one decimal place)
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In the context of sound frequency analysis, the lower and upper frequencies of a 1/1 octave band are 710 Hz and 1420 Hz respectively. The corresponding centre frequency of the band in Hz, is______. [round off to the nearest integer]
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In Batte Environmental Evaluation System (BEES) of Environment Impact Assessment (EIA), “air pollution” has a Parameter Importance Unit (PIU) value of 52. The Environment Quality (EQ) score of a project with respect to air pollution was 0.8 before the project implementation and it becomes 0.6 after the project implementation. The difference in the “Environmental Impact Unit” (EIU), before and after the project implementation is ______. [round off to 2 decimal places]
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A 10 ml sample of wastewater is diluted with water having no BOD, to fill a 300 ml BOD bottle. The initial DO of the diluted waste water is 9.0 mg/l. If the BOD₅ of the waste water sample is 60 mg/l, the final DO of the diluted waste water in mg/l, is
Your answerChoose one option.
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CO is released from a point source on a level ground at a rate of 25 g/s. The average wind speed is 5 m/s. The dispersion coefficients are 150 m and 200 m in horizontal and vertical directions, respectively, at a receiver station located on the ground along the downwind direction. Assuming the plume follows Gaussian dispersion model, the concentration of CO, in μg/m³, at the station is ______. [round off to 2 decimal places]
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The availability of water in the root zone for plant use is maximum in the case of
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A coarse sand aquifer has porosity 20% and hydraulic conductivity
m/s. If the hydraulic gradient is 0.00423 (m/m), then the average linear velocity of the groundwater in mm/s, (rounded off to three decimal places) is __________.Log in to check the answer
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The ionic concentration of a mine water sample with pH close to 7.0 is given below. The alkalinity of the water expressed as equivalent CaCO
, in mg/l, (rounded off to two decimal places) is __________.Cations | mg/l | Anions | mg/l |
|---|---|---|---|
Ca | 95.0 | HCO | 160.0 |
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Open questionMNNAT2 marksNeeds review
Three equipment A, B, and C located side by side and operating simultaneously produce a sound power level of 77.5 dB. The sound power levels of A and B are 68 dB and 70 dB respectively. The sound power level of C (rounded off to one decimal place) in dB, is
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