GATE ES branch:es PYQs & Answers — Page 28

Questions 271–280 of 390. Imported answers require independent review unless marked reviewed.

A student reported following arsenic concentrations in water samples:

| Arsenic concentration (mg/L) | 0.10 | 0.12 | 0.20 | 0.05 | 0.40 | 0.30 | 0.35 |

Which one of the following is a correct statement about arsenic concentration distribution?

Your answerChoose one option.

Arsenic concentration distribution is symmetric

Arsenic concentration distribution is positively skewed

Arsenic concentration distribution is negatively skewed

Arsenic concentration is following Weibull distribution

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X is normally distributed with following data (25.8, 36.6, 26.3, 21.8, 27.2). Select the correct statement about X (

Your answerChoose one option.

Population mean ≤ 25 with 95% confidence

Population mean ≤ 25 with 100% confidence

Population mean > 25 with 95% confidence

Population mean > 25 with 100% confidence

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Assuming

; Laplace transform for

Your answerChoose one option.

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Given P is

matrix, Q is

matrix, R and S are

matrices, and superscript T denotes transpose. Consider

Relationship 1:

Relationship 2:

Which one of the following is correct?

Your answerChoose one option.

Relationship 1 is false; Relationship 2 is false

Relationship 1 is true; Relationship 2 is false

Relationship 1 is true; Relationship 2 is true

Relationship 1 is false; Relationship 2 is true

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Specific conductance is used in water analysis to indirectly estimate dissolved solids. The measurements used in the method accounts for

Your answerChoose one option.

Cations only

All ions

Anions only

Un-ionized species

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Ten litres of the sample was filtered through a membrane filter and the filter was transferred to solid agar media which supports growth of coliform organisms. After incubation at 37 °C for 48 hours, the agar plates showed an average of 64 colonies per plate. What was the average concentration of coliform organisms (in Colony Form Units per unit volume) in the original water sample?

Your answerChoose one option.

64 CFU/ml

640 CFU/ml

6.4 × 10⁻³ CFU/ml

64 × 10⁻³ CFU/ml

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Reverse Transcriptase Polymerase Chain Reaction is an analytical procedure used in detection of pathogenic microorganisms. Which one of the following statements is NOT correct in this context?

Your answerChoose one option.

It is used for identifying presence or absence of specific RNA in samples.

It is used only for identifying Corona Viruses, including SARS CoV2 in samples.

It cannot differentiate between viable and inactivated viruses.

It is based on conversion of RNA to DNA followed by DNA amplification.

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Consider the following statements

Statement 1: Goodrich method for reservoir routing is based on hydrologic flood routing method.

Statement 2: Muskingum method for channel routing is based on hydraulic flood routing method.

Which one of the following is correct?

Your answerChoose one option.

Statement 1 is false; Statement 2 is false

Statement 1 is true; Statement 2 is false

Statement 1 is true; Statement 2 is true

Statement 1 is false; Statement 2 is true

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The correct order of hydraulic conductivity for the geologic formations is

Your answerChoose one option.

Aquifer > Aquitard > Aquiclude > Aquifuge

Aquifer < Aquitard < Aquiclude < Aquifuge

Aquitard > Aquifer > Aquifuge > Aquiclude

Aquifer > Aquiclude > Aquitard > Aquifuge

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Centrifugal pumps with suction pipe (shown by solid arrow) and delivery pipe (shown by dotted arrow) are shown in the figures. Choose the option that gives the correct connection

Your answerChoose one option.