Environmental Science and Engineering
GATE ES topic:environmental-engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 61–70 of 390. Imported answers require independent review unless marked reviewed.
Question 61
Open questionESNAT2 marksNeeds review
An anaerobic digestion system is operated for methane gas generation from organic fraction of municipal solid waste (OFMSW). The moisture content and volatile solids (VS) content of OFMSW are 20% and 90%, respectively. The biodegradable volatile solids (BVS) in the VS is 70%, and the BVS conversion efficiency to methane gas is 85%.
If the methane gas generation in the system is 12 m
per kg of BVS converted, the total volume of gas produced from one kilogram of OFMSW is _____ m
(rounded off to two decimal places).Log in to check the answer
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Open questionESNAT2 marksNeeds review
The characteristics of two types of solid waste are given in the table.
The quantity of sludge to be added to leaves to achieve a C/N ratio of 25 (on dry basis) for the mixed waste is _____ kg of sludge/kg of leaves (rounded off to three decimal places).
Type of solid waste | Moisture content (%) | Nitrogen content (%) | Carbon to Nitrogen (C/N) ratio |
|---|---|---|---|
Leaves | 50 | 0.7 | 50 |
Sludge | 75 | 5.6 | 6.3 |
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Open questionESNAT2 marksNeeds review
The concentration of chemical A in ambient air is 50 μg/m
and the toxicological index limit for a threshold health effect for this chemical is 5 mg.If the average breathing rate is 4 L/min, the minimum time of exposure that can lead to any health effect is _____ days (rounded off to one decimal place).
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Open questionESNAT2 marksNeeds review
The area in the first quadrant bounded by the function
and the coordinate axes is _____ square units (answer in integer).Log in to check the answer
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Open questionESNAT2 marksNeeds review
An agricultural land can support energy crops yield to produce 7000 L of bioethanol per hectare and energy content of bioethanol is 21 MJ/L. This bioethanol displaces fossil-based petrol.
The CO
offset potential of land used for growing energy crops as a bioethanol feedstock is _____
g of CO
/hectare (rounded off to one decimal place).Consider CO
footprints of 10 g and 80 g of CO
per MJ for bioethanol and petrol, respectively.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 1
Open questionGAMCQ1 markNeeds review
Courage : Bravery :: Yearning : __________
Select the most appropriate option to complete the analogy.
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
We __________ tennis in the lawn when it suddenly started to rain.
Select the most appropriate option to complete the above sentence.
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
A 4 × 4 digital image has pixel intensities (
) as shown in the figure. The number of pixels with
is: 
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
In the given figure, the numbers associated with the rectangle, triangle, and ellipse are 1, 2, and 3, respectively. Which one among the given options is the most appropriate combination of P, Q, and R?
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
A rectangle has a length L and a width W, where L > W. If the width, W, is increased by 10%, which one of the following statements is correct for all values of L and W?
Your answerChoose one option.
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