GATE ES topic:environmental-engineering PYQs & Answers — Page 18

Questions 171–180 of 390. Imported answers require independent review unless marked reviewed.

A gravity settling chamber of height ‘H’ and length ‘L’ is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is ‘Vₕ’ and terminal settling velocity of the target particle is ‘Vₜ’.

Which one of the following expressions is the correct concept used to calculate the minimum size of the target particle that will be removed with 100% efficiency?

Your answerChoose one option.

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Consider the function

Expand f(x+h) using Taylor’s series. In this context, the correct statement(s) is/are

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

Second term in the Taylor’s series i.e., the term which includes h is:

First term is

Third term in the Taylor’s series i.e., the term which includes

is:

Third term in the Taylor’s series i.e., the term which includes

is:

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Enzymes with the class of enzymes are listed in the table.

Enzyme	Class of Enzyme
(a) Lactate dehydrogenase	(i) Isomerases
(b) Alanine racemase	(ii) Transferases
(c) Lipase	(iii) Oxidoreductases
(d) Hexokinase	(iv) Hydrolases

Select the correct match(es)

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

(a) - (iii); (b) - (i)

(a) - (ii); (b) - (iv)

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With reference to disinfection, which of the following statement(s) is/are CORRECT?

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

Ethanol damages lipid structures in the bacterial cell membrane.

Mercuric chloride inactivates cellular enzymes containing sulfhydryl groups.

Glutaraldehyde inactivates protein.

Isopropyl alcohol cannot be used as a disinfectant.

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Which of the following statement(s) is/are CORRECT?

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

DNA is composed of nucleotides.

Five types of nitrogenous bases occur in DNA.

Each phosphate is attached to two deoxyribose units in a single strand of DNA.

The ratio of adenine to guanine is always 1:1 in a double stranded DNA.

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The Streeter–Phelps oxygen sag equation for a river is based on a few assumptions. The correct assumption(s) is/are

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

At any instant the deoxygenation rate is direct proportional to the amount of oxidizable organic material present.

At any instant the deoxygenation rate is inversely proportional to the amount of oxidizable organic material present.

The reoxygenation rate is directly proportional to the dissolved oxygen deficit.

The reoxygenation rate and deoxygenation rate are directly proportional to the saturation concentration of dissolved oxygen.

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Water is flowing FULL through a rectangular tunnel of size 3 m (width) × 2 m (height). The average velocity of flow is 1 m/s. The frictional head loss is observed to be 1 m per km. Consider acceleration due to gravity (g) as 10 m/s². The correct statement(s) is/are

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

Hydraulic radius is 0.6 m

Darcy-Weisbach friction factor is 0.048

Hydraulic radius is 2 m

Darcy-Weisbach friction factor is 0.024

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Based on the ISO 14040 methodology for Life Cycle Assessment, match the terms with the descriptions in the table.

Term	Description
(a) Goal and Scope	(i) Based on the product or system, the comparative unit must be carefully defined and be same for all scenarios
(b) Functional Unit	(ii) The problem is described, and the objective of the study are defined
(c) Life Cycle Inventory	(iii) Evaluates the environmental implications due to the inventorized emissions
(d) Impact Assessment	(iv) Process based approach and input-output approach

The correct match(es) is/are

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

(a)-(ii); (b)-(i);

(a)-(ii), b-(i)

(c)-(ii), (d)-(iv)

(c)-(iv), (d)-(iii)

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Consider the equation for a curve,

The area enclosed by the curve, the

-axis (

line); the vertical lines passing through

and

is ______ (rounded off to 2 decimal places)

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The pH of a solution containing 0.1M of acetic acid and 0.05 M of sodium acetate is ______ (rounded off to 2 decimal places).

The pKₐ value of ionization of acetic acid is 4.76.

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GATE ES topic:environmental-engineering PYQs

Question 41

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Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50