GATE ES topic:environmental-engineering PYQs & Answers — Page 30

Questions 291–300 of 390. Imported answers require independent review unless marked reviewed.

Biodegradable wastes like vegetable peels from kitchen are usually processed by composting techniques. Which of the following option(s) regarding the process of biodegradable wastes is/are correct?

Your answerSelect all correct options. You can choose more than one.

Vermi-composting is relatively faster than window composting, however vermi-composting is not frequently used on large commercial scale.

The window height should be as short as possible as large window height may cause compaction due to the self-weight.

The window height should be as large as possible as that will help to ensure appropriate temperature within the window.

Earthworms facilitate the growth of microorganisms and break down complex organic molecules to simpler ones using enzymatic secretions.

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As per ‘Hazardous and Other Wastes (Management and Transboundary Movement) Rules, 2016 of Govt. of India, the import of hazardous and other wastes from any country shall NOT be permitted for which of the following option(s)?

Your answerSelect all correct options. You can choose more than one.

Recovery, reuse and recycle

Disposal in abandoned mines

Safe disposal in engineered landfills

Utilization, including co-processing

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The Ministry of Environment, Forest and Climate Change (MoEF&CC), Govt. of India has published the Environment Impact Assessment (EIA) draft Notification 2020, intended to replace the existing EIA Notification, 2006 under the Environment (Protection) Act, 1986. Which of the following is/are the key change(s) from existing regulation?

Your answerSelect all correct options. You can choose more than one.

Removal of several project/ activities from the purview of public consultation.

A list of projects has been included under Category B2, expressly exempted from the requirement of an EIA.

All the project related activities are brought under the purview of necessary public consultation.

A list of projects has been included under Category B2, bring them under the requirement of detailed EIA.

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is ________ (rounded off to one decimal place)

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The following figure shows a 2-hour unit hydrograph (1 cm rainfall excess) for a catchment area of 540 hectare.

Diagram for Environmental Science and Engineering question 35

The peak discharge (in m

/s, rounded off to one decimal place) of the above unit hydrograph is __________

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Given,

;

. The problem is a/an

Your answerChoose one option.

initial value problem having solution

boundary value problem having solution

initial value problem having solution

boundary value problem having solution

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Eigen values of the matrix

are

Your answerChoose one option.

1 and 2

1 and 3

1 and −2

0 and 3

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For an exponentially growing microbial culture, the specific growth rate (μ) is related to its doubling time (t

) by which one of the following relations?

Your answerChoose one option.

= μ

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A microbial culture, with a specific growth rate of μ

(per hour), is being grown in a continuous reactor at steady state with hydraulic retention time (HRT) of 24 hours. This reactor is subjected to a perturbation by reducing the HRT to 12 hours. The reactor recovers from the perturbation and comes to a new steady state with a new specific growth rate of μ

(per hour). Which one of the following statements is correct?

Your answerChoose one option.

= μ

= 0.5 μ

= e

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Which one of the following statements is NOT correct with respect to a batch reactor?

Your answerChoose one option.

No reactant is added after the reactor has started operation.

No product is withdrawn during the course of the reactor operation.

The reactor operates under steady state.

The reactor operation is carried out for a pre-specified duration.

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GATE ES topic:environmental-engineering PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40