GATE ES branch:es PYQs & Answers — Page 5

Questions 41–50 of 390. Imported answers require independent review unless marked reviewed.

The analysis of a water sample is shown in the table. The hardness of the water sample is ______ mg/L as CaCO

Atomic weight (g/mol): Ca = 40; Mg = 24; Na = 23; Cl = 35.5; S = 32; O = 16; N = 14

Species	Concentration (mg/L)
Na	30
Ca	10
Mg	15
Cl	30
SO	60
NO	5

Your answerChoose one option.

87.5

62.5

25.5

47.5

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A system of linear equations is given as

, where

, and

is the solution vector. Which of the following statements is/are TRUE for this system?

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

Matrix

is skew-symmetric.

Eigenvalues of matrix

are real.

The system is homogeneous.

The system is singular.

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Which of the following statements is/are CORRECT based on the electron donor (ED) and electron acceptor (EA) used in various bacterial mediated reactions in wastewater treatment?

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

In anaerobic heterotrophic acid fermentation, organic compounds are used as both ED and EA.

In anaerobic heterotrophic methanogenesis, volatile fatty acids and CO₂ are used as ED and EA, respectively.

In denitrification process by denitrifiers, organic compounds and CO₂ are used as ED and EA, respectively.

In aerobic autotrophic iron oxidation, Fe(II) and O₂ are used as ED and EA, respectively.

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Which of the following options is/are TRUE about reverse osmosis process?

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

Reverse osmosis is used as a pretreatment for microfiltration process.

Ultrafiltration is used as a pretreatment for reverse osmosis process.

Membrane fouling occurs in microfiltration and reverse osmosis processes.

Concentration polarization does not occur in reverse osmosis process.

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Which of the following options is/are TRUE about coagulation-flocculation process?

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

Collision of colloidal particles due to their Brownian motion results in orthokinetic flocculation.

Collision of colloidal particles due to the external mixing of bulk medium results only in perikinetic flocculation.

In an electric double layer model of a colloidal particle, Stern layer is more compact than the diffuse layer.

The zeta potential is also called Stern potential.

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Which of the following options is/are CORRECT assumption(s) in the Gaussian plume dispersion model?

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

The concentration of pollutants emitting from stack is continuous.

The process is under steady state.

The pollutants emitted are non-conservative.

The diffusion of pollutants is dominant in comparison with advection in the direction of wind.

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The sound level measured at various locations in an urban area is given in the table. The average sound level for that area is ______ dBA (rounded off to two decimal places).

Location	A	B	C	D
Sound level (dBA)	40	55	65	75

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Standard deviation for the particulate matter (PM) concentrations listed in the table is ______ μg/m³ (rounded off to one decimal place).

Location No.	1	2	3	4	5	6	7
PM concentration (μg/m³)	45	40	55	65	60	35	50

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The mixing ratio of CO₂ at a pressure of 1 atm and at 300K is reported as 340 ppmv. Considering ideal gas conditions, the equivalent concentration of CO₂ in air is ______ mg/m³ (rounded off to two decimal places).

The molecular weight of CO₂ = 44 g/mol

Universal gas constant = 8.314 J/mol-K

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Reaction A → B follows first-order element kinetics and the reaction rate constant for A is 0.01 per min. The time taken to reduce the concentration of A from 100 M to 10 M in a batch reactor is ______ min (rounded off to one decimal place).

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GATE ES branch:es PYQs

Question 41

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Question 44

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Question 50