GATE ES discipline:civil-and-environmental-engineering PYQs & Answers — Page 20

Questions 191–200 of 390. Imported answers require independent review unless marked reviewed.

Food waste, paper waste and plastic waste have typical densities of 280 kg/m

, 80 kg/m

, and 50 kg/m

, respectively. The mixed waste is composed of 70% food waste, 20% paper waste and 10% plastic waste. The density of the mixed waste is ______ kg/m

(rounded off to 2 decimal places). Neglect compaction effect.

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For a biodegradable waste with a chemical formula C

N, the maximum theoretical methane production per ton of waste is ______ kg (rounded off to 2 decimal places). Assume 100% anaerobic conversion. Atomic weights of C-12; H-1; O-16; N-14

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A person consumes 2.5 liters of water per day. The water quality test indicated that the supplied water has a Pb concentration of 0.6 mg/L. If the weight of the person is 75 kg, the exposure level for Pb for this person from this drinking water source is ______ mg/kg/day (rounded off to 2 decimal places).

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In a region, total annual consumption of gasoline is 30.6 million tons. The land required for growing sugarcane to produce enough bioethanol to replace the gasoline completely is ______ km

(an integer value). Ethanol energy equivalent is 67% of gasoline, gasoline density is 850 kg/m

, yield of bioethanol produced from sugarcane per hectare of land is 3750 L, and 1 km

= 100 hectares.

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Initially a bottle contained 400 g of ethanol. Half of ethanol was used by a student for preparing the stock solution in an environmental chemistry laboratory just before summer vacation of 90 days. After completing the procedure, the student left the bottle uncorked. If the unsealed bottle loses ethanol at a rate of 0.5 g/day, the ethanol that will be left in the bottle at the end of the summer vacation is ______ g (an integer value).

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Rafi told Mary, “I am thinking of watching a film this weekend.” The following reports the above statement in indirect speech: Rafi told Mary that he ______ of watching a film that weekend.

Your answerChoose one option.

thought

is thinking

am thinking

was thinking

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Permit : ______ : : Enforce : Relax (By word meaning)

Your answerChoose one option.

Allow

Forbid

License

Reinforce

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Given a fair six-faced dice where the faces are labelled ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, and ‘6’, what is the probability of getting a ‘1’ on the first roll of the dice and a ‘4’ on the second roll?

Your answerChoose one option.

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A recent survey shows that 65% of tobacco users were advised to stop consuming tobacco. The survey also shows that 3 out of 10 tobacco users attempted to stop using tobacco.

Based only on the information in the above page, which one of the following options can be logically inferred with certainty?

Your answerChoose one option.

A majority of tobacco users who were advised to stop consuming tobacco made an attempt to do so.

A majority of tobacco users who were advised to stop consuming tobacco did not attempt to do so.

Approximately 30% of tobacco users successfully stopped consuming tobacco.

Approximately 65% of tobacco users successfully stopped consuming tobacco.

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How many triangles are present in the given figure?

Diagram for Environmental Science and Engineering question 5

Your answerChoose one option.

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GATE ES discipline:civil-and-environmental-engineering PYQs

Question 61

Question 62

Question 63

Question 64

Question 65

Question 1

Question 2

Question 3

Question 4

Question 5