GATE ES year:2022 PYQs & Answers — Page 5

Questions 41–50 of 65. Imported answers require independent review unless marked reviewed.

A bag filter is used for removal of particulate matter having a range of sizes. The correct sequence of air filtration mechanisms for their removal, in order of decreasing size, is

Your answerChoose one option.

Diffusion, Impaction, Disintegration

Disintegration, Impaction, Interception

Diffusion, Impaction, Interception

Impaction, Interception, Diffusion

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A relatively calm room has background sound power level (SPL) of 30 decibels (dB). A television and a radio with SPL of 80 dB and 70 dB, respectively, started operating simultaneously in this room. Given the reference sound power is

Watts, what will be the resulting SPL in the room, assuming all the sources operate independently?

Your answerChoose one option.

180.0 dB

80.4 dB

82.4 dB

150.0 dB

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During night, in troposphere, which of the following is/are NOT correct

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

NO₂ + hν → NO + O

Most of the NOₓ (i.e., NO + NO₂) converts to NO

NO + O₃ → NO₂ + O₂

Most of the NOₓ (i.e., NO + NO₂) converts to NO₂

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A typical plasmid-free bacterial cell having a single chromosome consists of ~55% protein, ~3% DNA and ~21% RNA, where “%” represents percentage of dry weight. Assuming there are 250 different types of protein molecules (with at least one copy number) being expressed in a living bacterial cell at any given time, which of the following statement(s) are NOT correct with respect to the number of intracellular DNA, RNA and protein molecules?

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

DNA = RNA = Protein ≥ 250

DNA = RNA = 1; Protein ≥ 250

DNA = 1; RNA = Protein ≥ 250

DNA = 1; RNA > Protein ≥ 250

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Average values of the re-aeration rate constant for river X and river Y are 0.92 per day and 1.12 per day, respectively. Average de-oxygenation rate constants for the same rivers are 0.23 per day and 0.35 per day respectively. Then, which of the following statement(s) is/are correct?

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

Self-purification capacity of river Y is more than that of river X.

Self-purification capacity of river X is more than that of river Y.

River Y has higher turbulence and/or higher velocity and/or higher algal growth compared to river X.

Pollutants in river X are more biodegradable than that in river Y.

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Which of the following statement(s) is/are NOT correct while comparing continuously stirred tank reactor (CSTR) and plug flow reactor (PFR)?

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

CSTR and PFR are normally operated under steady state condition.

There is complete homogeneity in the CSTR while there are concentration variations within the PFR.

The overall reaction carried out in a PFR is always higher than that in a CSTR for same total volume.

Reaction kinetics do not play any role in choosing between a CSTR and PFR.

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According to the National Ambient Air Quality Standards (Central Pollution Control Board, Govt. of India, notification 2009) which of the following statement(s) is/are correct?

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

SO₂ and NO₂ have annual average standards; while O₃ and CO have eight hour average standards.

SO₂ and CO have annual average standards; while O₃ and NO₂ have eight hour average standards.

SO₂ and CO have eight hour average standards; while O₃ and NO₂ have hourly average standards.

SO₂ and NO₂ have 24 hour average standards; while O₃ and CO have hourly average standards.

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Consider the figure shown below for three different cases:

Diagram for Environmental Science and Engineering question 48

Which of the following statement(s) is/are correct for surface level emissions, given the environmental temperature?

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

Case P represents unstable atmosphere and results in higher dispersion of emissions.

Case Q represents subsidence inversion and results in higher dispersion of emissions than Case P.

Case Q represents elevated inversion and results in lower dispersion of emissions than Case P.

Case R represents subsidence inversion and results in lower dispersion of emissions than Case P.

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As per the Solid Waste Management Rules of 2016 (Govt. of India), which of the following statement(s) is/are correct?

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

Biodegradable waste should be processed biologically preferably in decentralized facilities at the sources of generation.

Biodegradable waste should be processed biologically preferably in centralized facilities away from the sources of generation.

Used sanitary pads and napkins should be wrapped and disposed into the domestic hazardous waste containers.

Non-biodegradable components with a heat content more than 1500 kcal/kg should be used for power generation or Refuse Derived Fuel (RDF) manufacture.

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Carbon cycle, nitrogen cycle and phosphorus cycle play important role in the ecosystems. Which of the following statement(s) is/are NOT correct about the phosphorus cycle?

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

Shortage of phosphorus can be a limiting factor in many ecosystems, however, its excess can stimulate eutrophication.

Organic phosphates exist in various rock and soil minerals.

Like carbon cycle, phosphorus also has a gaseous phase and can move into far away ecosystems.

Human interventions like application of phosphorus fertilizers cause much phosphorus to get into the ocean.

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GATE ES year:2022 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50