GATE ES topic:environmental-science PYQs & Answers — Page 17

Questions 161–170 of 390. Imported answers require independent review unless marked reviewed.

As per the Hazardous Waste (Management and Handling) Rules, 2016, of India, which is/are the characteristic(s) that must be exhibited by a waste to be classified as a “characteristic” hazardous waste?

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

Ignitability

Reactivity

Radioactivity

Toxicity

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has a local maximum at x = ______ (an integer value) in the range x = −2 to +2.

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Consider the equation

; with y = 1 at x = 0.

The value of y at x = 1 is ______ (rounded off to 2 decimal places).

Take the value of e (base of natural logarithm) as 2.7.

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A municipal solid waste digester generates 1000 kg of methane gas. The volume of the tank need to store this gas at 30 °C and 3 atmospheric pressure is ______ liters (an integer value).

Use R=0.082 L-atm/mole-K, Atomic weights of C=12, and H=1

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A Class-A pan was setup adjacent to a lake for measuring evaporation losses in the lake. The depth of water in the pan at the begining of a certain week was 250 mm. In that week, there was a rainfall event with 10 mm depth. Water depth in the pan at the end of the week was 240 mm. The pan coefficient is 0.8.

The estimated lake evaporation during the week was ______ mm (an integer value).

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A population (with mean

) follows normal distribution. Ten samples (N) are drawn at random with a mean value of “x” and standard deviation of “S”. Following table provides the confidence limits, C(t) of the cumulative probability function for Student’s t – distribution two-tailed test with degree of freedom D.

Which one of the following expression is correct for testing the null hypothesis H₀:

at 10% significance level?

D	C(t)=0.9	C(t)=0.95	C(t)=0.975
9	1.38	1.83	2.26
10	1.37	1.81	2.23
11	1.36	1.80	2.20

Your answerChoose one option.

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Which one is the solution y(x) for the following ordinary differential equation and the specified boundary conditions?

Your answerChoose one option.

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A saturated CaCO₃ stock solution is existing at 25°C. In one experiment (i) 25 g Na₂CO₃ is added to the stock solution. In another experiment (ii) 25 g Na₂SO₄ is added to the stock solution. Select the correct statement from the following.

Your answerChoose one option.

Addition of (i) increases the concentration of Ca²⁺ and addition of (ii) decreases the concentration of Ca²⁺

Addition of (i) decreases the concentration of Ca²⁺ and addition of (ii) increases the concentration of Ca²⁺

Addition of (i) and (ii) increase the concentration of Ca²⁺

Addition of (i) and (ii) decrease the concentration of Ca²⁺

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Consider second order kinetics (

) under steady state condition. The ratio of volume of a complete mixed reactor (CMR) to that of a plug flow reactor (PFR) to achieve 90% reduction in the concentration is ______.

Inlet concentrations in both the reactors are same.

Your answerChoose one option.

10.0

1.0

0.1

2.3

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Consider two horizontal layers of an aquifer as shown in figure. Each layer is isotropic and homogenous. Flow is parallel to the stratification. Thickness and horizontal hydraulic conductivity of layer-1 are h₁ and K₁, respectively. Thickness and horizontal hydraulic conductivity of layer-2 are h₂ and K₂, respectively, where h₁ is not equal to h₂. The equivalent horizontal conductivity Kₓ for the aquifer system is given by ______.

Diagram for Environmental Science and Engineering question 40

Your answerChoose one option.

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GATE ES topic:environmental-science PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40