GATE ES topic:environmental-engineering PYQs & Answers — Page 37

Questions 361–370 of 390. Imported answers require independent review unless marked reviewed.

The 2×2 matrices P and Q satisfy the following relations:

and

The matrix Q is equal to __________.

Your answerChoose one option.

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A biased die has six faces numbered as

and 6. On rolling the die, the probability of the number

appearing is proportional to

. What is the probability that an even number will appear on rolling the die?

Your answerChoose one option.

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Match the entries in Column I with the correct entries in Column II.

Column I	Column II
P. Diffusion	(i) Pasquill
Q. Drag force	(ii) Fick
R. Atmospheric stability	(iii) Stokes

Your answerChoose one option.

P-(iii), Q-(ii), R-(i)

P-(ii), Q-(i), R-(iii)

P-(i), Q-(iii), R-(ii)

P-(ii), Q-(iii), R-(i)

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Which of the following international multilateral agreements (conventions, protocols) from Column I match with the entries in Column II?

Column I	Column II
P. Ramsar Convention	(i) Ozone depletion
Q. Kyoto Protocol	(ii) Trans-boundary movement of hazardous wastes
R. Basel Convention	(iii) Climate change
S. Montreal Protocol	(iv) Conservation of wetlands

Your answerChoose one option.

P-(iv), Q-(iii), R-(ii), S-(i)

P-(iv), Q-(ii), R-(iii), S-(i)

P-(iii), Q-(i), R-(ii), S-(iv)

P-(i), Q-(iii), R-(iv), S-(ii)

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An ideal PFR or an ideal CFSTR may be used to degrade a pollutant with first order reaction kinetics. Both the reactors are fed with the same inlet concentration and the same volumetric flow rate, and are designed to achieve the same outlet concentration. Which of the following statements is true when comparing PFR with CFSTR?

PFR is Plug Flow Reactor.

CFSTR is Continuous Flow Stirred Tank Reactor (also referred to as CSTR).

Your answerChoose one option.

PFR will always require less reactor volume than CFSTR.

PFR will require the same reactor volume as CFSTR.

CFSTR will always require less reactor volume than PFR.

CFSTR can sometimes require less reactor volume than PFR.

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A 200 mL sample of water has an initial pH = 9. In order to determine alkalinity, the sample was titrated using 0.02 N H₂SO₄ acid to an end point of pH = 4.5. In the titration, 25 mL of 0.02 N H₂SO₄ acid was required. What is the total alkalinity of the sample in ‘mg/L as NaHCO₃’?

[Atomic weight (g/mol): Ca = 40, Na = 23, H = 1, C = 12, S = 32, and O = 16]

Your answerChoose one option.

125

210

305

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A sewage treatment plant (STP) receives sewage at a flow rate of 20000 m³ per day. The sewage has 200 mg/L of suspended solids. Assume 60 % suspended solids are removed in the primary clarifier. The underflow (i.e. sludge) removed from the clarifier contains 5 % solids (by weight).

The daily volume of the sludge generated will be ______ m³ per day.

Assume sludge density = 1000 kg/m³.

Your answerChoose one option.

480

800

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In context of municipal solid waste treatment, match the equipment in List I with their function in List II.

List I	List II
P. Trommel	(i) Size reduction
Q. Magnetic separator	(ii) Aluminum separation
R. Hammer mill	(iii) Screening
S. Eddy current separator	(iv) Ferrous metal recovery

Your answerChoose one option.

P-(iii), Q-(iv), R-(i), S-(ii)

P-(iii), Q-(ii), R-(iv), S-(i)

P-(i), Q-(iv), R-(iii), S-(ii)

P-(iv), Q-(ii), R-(i), S-(iii)

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The characteristics of a water sample are as follows: Na⁺ = 92 mg/L, K⁺ = 19.5 mg/L, Ca²⁺ = 40 mg/L, and Mg²⁺ = 24 mg/L. What is the sodium adsorption ratio (SAR) of the water sample which may be considered for irrigation purposes?

[Atomic weight (g/mol): Na = 23, K = 39, Ca = 40, and Mg = 24]

Your answerChoose one option.

2.83

1.94

2.00

4.00

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Which of the following is true for the nitrifying bacteria belonging to genus Nitrobacter?

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

They are autotrophs.

They are eukaryotes.

They convert chemical energy to cellular energy using mitochondria.

They convert NO₃⁻ to NO₂⁻.

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GATE ES topic:environmental-engineering PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35