GATE ES format:mcq PYQs & Answers — Page 16

Questions 151–160 of 200. Imported answers require independent review unless marked reviewed.

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Given,

;

. The problem is a/an

Your answerChoose one option.

initial value problem having solution

boundary value problem having solution

initial value problem having solution

boundary value problem having solution

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Eigen values of the matrix

are

Your answerChoose one option.

1 and 2

1 and 3

1 and −2

0 and 3

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

For an exponentially growing microbial culture, the specific growth rate (μ) is related to its doubling time (t

) by which one of the following relations?

Your answerChoose one option.

= μ

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A microbial culture, with a specific growth rate of μ

(per hour), is being grown in a continuous reactor at steady state with hydraulic retention time (HRT) of 24 hours. This reactor is subjected to a perturbation by reducing the HRT to 12 hours. The reactor recovers from the perturbation and comes to a new steady state with a new specific growth rate of μ

(per hour). Which one of the following statements is correct?

Your answerChoose one option.

= μ

= 0.5 μ

= e

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE ES format:mcq PYQs

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 36

Question 37

Question 38

Question 39