GATE ES topic:environmental-science PYQs & Answers — Page 36

Questions 351–360 of 390. Imported answers require independent review unless marked reviewed.

Topic practice 390 questionsPage 36 of 39

The oxidation states of ‘N’ in

, and NO are __________, respectively.

Your answerChoose one option.

+2, −3, and +3

−3, +3, and +2

−3, +3, and −4

+4, −2, and +2

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What is the pH of a water sample having

concentration of 10 mg/L? The atomic weight of H is 1 g/mol.

Your answerChoose one option.

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Which of the following pairing of nucleotide bases is present in double helix DNA?

Your answerChoose one option.

Thymine - Cytosine

Adenine - Thymine

Cytosine - Adenine

Uracil - Thymine

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Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?

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

CFC-11

CO₂

HCFC-22

N₂O

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The ordinary differential equation

has

as the dependent variable and

as the independent variable. Which of the following classification(s) is/are applicable to the equation?

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

Linear

Non-linear

First order

Second order

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Consider the following equation:

Which of the following is/are the root(s) of the above equation?

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

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A wind rose is a representation of meteorological conditions. Which of the following is/are included in this representation?

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

Mixing height

Wind speed

Wind direction

Percentage of time

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A flocculation tank used for water treatment has a velocity gradient (G) of 800 s⁻¹. The volume of the tank is 40 m³. The dynamic viscosity of water is 9×10⁻⁴ N·s/m². The theoretical power required to maintain the given velocity gradient is __________ kW (rounded off to the nearest integer).

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In a sample, the growth of microbial cells started with an initial concentration of 5×10⁴ cells per millilitre (mL) of the sample. After a certain time period, the cell concentration was found to be 1280×10⁴ cells per mL of the sample. Assuming binary fission of cells and no cell death, the number of generations of cell growth occurred in this time period is __________ (answer in integer).

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A water jet discharging from a 4 cm diameter orifice has a diameter of 3.5 cm at its vena contracta. The coefficient of velocity is defined as the ratio of the actual velocity of the jet at vena contracta to the theoretical velocity of the jet. If the coefficient of velocity is 0.98, the coefficient of discharge for the orifice will be __________ (rounded off to two decimal places).

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GATE ES topic:environmental-science PYQs

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25