GATE ES purpose:exam-prep PYQs & Answers — Page 24

Questions 231–240 of 390. Imported answers require independent review unless marked reviewed.

W₁, W₂, W₃...W₉ represent the holding times of 9 water samples, which follow a normal distribution with mean = 8.33 and standard deviation = 4.472. M represents the sample mean value of holding times, which also has a normal distribution. Assuming Z has a standard normal distribution (mean = 0 and standard deviation = 1), select the correct statement which describes the expression for calculating the value of type 1 error where

null hypothesis (H₀): M > 6

alternate hypothesis (Hₐ): M ≤ 6

Your answerChoose one option.

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Which one of the following statements is NOT correct?

Your answerChoose one option.

Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in the presence of light.

The process through which ATP is synthesised by cells (in mitochondria and chloroplasts) is called phosphorylation.

The Calvin cycle (carboxylation, reduction, and regeneration) occurs in all photosynthetic plants (C3, C4 or any other).

C3 plants have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, have high rate of photosynthesis and reduced rate of photorespiration as compared to C4 plants.

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Read the following statements

I. Bacteriophage is an anaerobic bacterium.

II. Male-specific bacteriophage infect via the pili of other microorganisms including viruses.

III. Bacteriophage is found in human as well as in animal excreta.

IV. Bacteriophage can not indicate the presence of bacteria.

The correct choice is

Your answerChoose one option.

(I), (III) and (IV) are correct

(IV) is correct; (III) is incorrect

Both (II) and (IV) are incorrect

Both (II) and (IV) are correct

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Read the following statements

i. In endogenous metabolism by aerobic bacteria, electron acceptor is present inside the cells.

ii. In endogenous metabolism by aerobic bacteria, electron acceptor is dissolved oxygen.

iii. The endogenous metabolism is linked to fermentative metabolism.

iv. In exogenous metabolism by aerobic bacteria, enzyme mediated electron transfer happens within the cells.

The correct choice is

Your answerChoose one option.

(i) is correct; (ii) is correct

(ii) is correct; (iii) is incorrect

(iii) is incorrect; (iv) is incorrect

(iii) is correct; (iv) is correct

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A boiler in an industry, located where high plume rise is expected, releases flue gas with fine particulate matter. Which one of the following options is most suited and efficient if the particulate matter is intend for reuse?

Your answerChoose one option.

reduce stack height and increase stack diameter

use of wet collectors

use of flue gas desulfurization (FGD)

use of electrostatic precipitator (ESP)

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Match the following

J) Dalton’s law K) Fick’s law L) Henry’s law M) Stoke’s law

i) Diffusion ii) Pressure exerted by a mixture of gases iii) Gravitational settling iv) Gas-liquid phase transfer

Your answerChoose one option.

J – ii; K – i; L – iv; M – iii

J – ii; K – ii; L – i; M – iv

J – ii; K – iii; L – iv; M – i

J – i; K – iv; L – ii; M – iii

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Read the following statements

I. According to the Liebig’s law of minimum, the growth is regulated by the limited factors i.e., resources in scarcity and not by the resources in abundance.

II. Shelford’s law of tolerance states that, only the factors present in excess/abundance can affect the growth, development of an organism or rate of biological process.

III. Shelford’s law of tolerance states that, an organism's success is based on a complex set of conditions and that each organism has a certain minimum, maximum, and optimum levels of environmental factor or combination of factors that determine success.

The correct choice is

Your answerChoose one option.

I and II are correct; III is incorrect

I and II are correct; II is incorrect

II is correct; I and III are incorrect

III is correct; I and II are incorrect

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Read the following statements

I. Trivalent chromium has relatively low aqueous solubility, and low mobility in the soil environment. By contrast, hexavalent chromium has a higher aqueous solubility and greater mobility in the soil environment.

II. The chemical reaction between trivalent chromium and zero-valent iron will result in transformed version called hexavalent chromium.

III. Hexavalent chromium is a known carcinogen.

IV. Trivalent chromium has relatively higher human toxicity as compared to hexavalent chromium.

The correct choice is

Your answerChoose one option.

IV is correct; I and III are incorrect

II is correct; I and IV are incorrect

I and III are correct; II and IV are incorrect

I, II and IV are correct; III is incorrect

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Which of the following statements is/are NOT true?

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

Urban heat island effect in a city can be reduced by increasing trees and vegetation cover in the city.

Urban heat island intensity is affected by PM₂.₅ concentrations in a city.

Urban heat island intensity increases due to installation of reflective roofs in a city.

In comparison with the non-urban areas, urban heat island effect raises night-time temperatures more than daytime temperatures in cities.

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Read the following statements about aerobic composting of organic fraction of municipal solid waste

I. The majority of the odor problem in aerobic composting process is due to the development of anaerobic conditions within the compost pile.

II. All organic carbon present in the waste will completely biodegrade in 14 days.

III. At high C/N ratio, ammonia would be released and biological activity may also be impeded.

IV. Optimum moisture content for aerobic composting process would be 50–60%. Lower moisture would slow down the biological process. Excessive moisture will make it difficult to maintain aerobic conditions.

The correct choice(s) is/are

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

I and IV are correct

II and III are incorrect

I is correct; IV is incorrect

II is correct; IV is incorrect

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GATE ES purpose:exam-prep PYQs

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