GATE ES year:2022 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

Carbon dioxide is used in recarbonation process. A solution has 1 mole/L supersaturated calcium carbonate. Estimated amount of carbon dioxide (in grams) needed to completely convert calcium carbonate to calcium ions in 1 litre solution is

Your answerChoose one option.

44.000 gram

0.044 gram

40.000 gram

0.040 gram

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A river water sample has pH of 4 and suspended solids concentration of 100 mg/L. If, alum is chosen as a coagulant, what will be the coagulation mechanism?

Your answerChoose one option.

Ionic layer compression only

Sweep coagulation and Polymer bridging

Polymer bridging only

Charge neutralization, surface adsorption, ionic layer compression

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Which one of the following is most commonly used raw material in flue gas desulfurization units?

Your answerChoose one option.

Limestone

Titanium Oxide

Fenton reagent

Beryllium Oxide

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Leachate generated from a legacy municipal solid waste dumping site has to be collected and managed carefully. Which one of the following statements is correct in the context of treatment of leachate from such a site?

Your answerChoose one option.

Setting chamber followed by micro-filtration units are required.

Modular treatment units targeting dissolved organic matter and salts are required.

Only biological treatment units like AS with extended aeration are required.

Only a combination of anaerobic-aerobic treatment units is required.

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Which one of the following statements is correct regarding Global warming?

Your answerChoose one option.

Water vapour does not contribute to global warming.

Global warming is likely to increase the productivity of plants due to CO₂ fertilization.

CFCs do not cause global warming, but can cause ozone layer depletion in stratosphere.

HFCs and HCFCs are good substitutes for the ozone depleting substances as they cause neither global warming nor ozone layer depletion.

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In context of ecosystems, which one of the following is NOT a correct statement?

Your answerChoose one option.

The growth of an organism such as a plant may be dependent on a number of different factors such as sunlight, mineral nutrients (nitrates, phosphates, etc.), etc. Liebig’s law states that, growth occurs at the rate permitted by the most limiting factor.

The carrying capacity of a population is determined by its limiting resources. Carrying capacity is the upper limit of an ecosystem up to which it can provide the basic needs to the population under given circumstances.

The Ramsar convention on lakes and backwater systems of International importance is an international treaty for the conservation and sustainable use of lakes and backwater systems. The treaty was signed in 1981 and became effective in 1985.

A Red Data Book contains lists of species whose continued existence is threatened. Species are classified into different categories of perceived risk. Each Red Data Book usually deals with a specific group of animals or plants and fungi.

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Which one of the following statements correctly defines the concept of ‘Extended Producer’s Responsibility’?

Your answerChoose one option.

The responsibility of a producer for environmentally sound disposal of the product after the end of its life

The responsibility of a producer for environmentally sound manufacturing process for the product

The responsibility of a producer for environmentally sound management of the product from manufacturing stage until it is sold in the market

The responsibility of a producer for environmentally sound management of the product until the end of its life

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If G represents Gibbs free energy, select the correct statement(s)

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

If ΔG = 0, reaction will proceed only in one direction

If ΔG = 0, reaction will be in equilibrium

If ΔG < 0, reaction will proceed forward

If ΔG > 0, reaction will not proceed forward

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For effluents generated by a molasses based distillery and wood based pulp and paper industry, which of the following statement(s) is/are NOT correct?

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

Both the effluents have dark colour.

Both the effluents have high toxicity.

Both the effluents generally have BOD greater than 15,000 ppm.

Both the effluents have high pH.

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PM₂.₅ concentrations in ambient air can be measured using

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

Beta attenuation method

Chemiluminescence method

Gravimetric method

Non dispersive infrared spectroscopy method

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GATE ES year:2022 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30