GATE ES 2025 Paper 1 — page 13

Questions 37–39 of 65. Imported answers require review unless explicitly marked reviewed.

Correctly label the speciation diagram below:

Diagram for Environmental Science and Engineering question 37

Your answerChoose one option.

I= PO₄³⁻, II= HPO₄²⁻, III= H₂PO₄⁻, IV= H₃PO₄

I= H₃PO₄, II= HPO₄²⁻, III= H₂PO₄⁻, IV=PO₄³⁻

I=H₃PO₄, II=H₂PO₄⁻, III=HPO₄²⁻, IV=PO₄³⁻

I= PO₄³⁻, II= H₂PO₄⁻, III= H₃PO₄, IV=HPO₄²⁻

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Consider the following statements on microbial metabolism (i) Utilization of carbon for cell synthesis is termed as anabolism. (ii) During catabolism, adenosine triphosphate (ATP) is converted into adenosine diphosphate (ADP). Choose the correct option from the following

Your answerChoose one option.

(i) and (ii) are correct

(i) and (ii) are incorrect

(i) is correct and (ii) is incorrect

(i) is incorrect and (ii) is correct

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Consider the following figure of an activated sludge process (ASP), depicting the flow (

), substrate (

), and microorganism concentration (

) at various points in the system, where subscripts “0”, “r”, “w”, “e”, and “i” indicate influent, recycle line, wastage, effluent, and flow from aeration tank to settling tank, respectively. Note that influent to the ASP has microbes too. V is volume of aeration tank.

Diagram for Environmental Science and Engineering question 39

Choose the correct option for net rate of formation of microorganisms in the system at steady state, from the following

Your answerChoose one option.

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2025 · Paper 1

Question 37

Question 38

Question 39