GATE ES purpose:exam-prep PYQs & Answers — Page 12

Questions 111–120 of 390. Imported answers require independent review unless marked reviewed.

Topic practice 390 questionsPage 12 of 39

According to the Bio-Medical Waste Management Rules, 2016, choose the correct option(s) from the following

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

Bio-medical waste generated should be taken to a common bio-medical waste management facility except for rural areas where common facility is not available.

Bio-medical waste generated should not be taken out of the hospital premise as it may contain dangerous pathogenic organisms.

The red bag containing the human anatomical wastes like amputated body parts, cotton and bandages contaminated with body fluids, etc. should be treated using autoclave or hydroclave to kill the pathogenic organisms.

Increasing operational temperature of an autoclave from 121 °C (pressure 15 psi) to 149 °C (pressure 52 psi), the residence time requirement for treating bio-medical waste will be reduced by 15 minutes.

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A residential family is considering two cities for relocation. The data related to pollutant exposure and associated health cost per year are given in the following figure.

Diagram for Environmental Science and Engineering question 47

The pollutant exposure is characterized in high, mild and low exposure categories with respective probability values. The difference in expected value of health cost of City 1 with respect to that of City 2 is ____________ lakhs/year. (rounded off to two decimal places).

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The following is a system of linear equations

The value of

is __________. (rounded off to two decimal places)

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The value of

is ________. (rounded off to two decimal places)

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A tank has inflow, outflow and stirring mechanism. Initially, the tank holds 500 L of a brine solution of concentration 200 g/L. At

, an inflow of another brine solution of concentration 100 g/L starts entering the tank at the rate of 15 L/minute. At the same time the outflow of thoroughly stirred mixture also takes place at the same rate so that the volume of brine in the tank remains constant. The brine concentration

(g/L) in the tank at any time

(minute) can be expressed by the following differential equation

The brine concentration in the tank at

hour is ________ g/L. (rounded off to two decimal places)

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Aerobic biomass has yield coefficient value of 0.4 for glucose (molecular weight = 180 g/mole) substrate. Bacteria is represented as

(molecular weight = 113 g/mole). Assume that no endogenous respiration occurs. The percentage of carbon going into

from 1 mole/L glucose is __________. (rounded off to two decimal places)

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The following figure (not to scale) depicts a rainfall hyetograph for a storm over a catchment.

Diagram for Environmental Science and Engineering question 52

If the storm produced a direct runoff of 12.5 mm, then the

-index of the storm for the catchment is ________________ mm/hour. (rounded off to two decimal places)

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The following table and figure (not to scale) show characteristics of a catchment

Diagram for Environmental Science and Engineering question 53

Sub-catchment	Area (ha)	Runoff coefficient	Time of concentration
P	750	0.5	1 hour
Q	1000	0.6	2 hour
R	1500	0.6	3 hour
S	2000	0.7	4 hour

The hyetograph resulting from a storm that occurred uniformly over the catchment, is as follows

Diagram for Environmental Science and Engineering question 53 (figure 2)

Assuming a constant base flow of 40 m³/s, the peak of the runoff hydrograph produced by storm for the catchment at the outlet O is ________________ m³/s. (rounded off to two decimal places)

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A homogeneous isotropic confined aquifer of uniform thickness 30 m has hydraulic conductivity of 5 m/day and porosity of 0.3. There are two observation wells X and Y along a radial line from a fully penetrating pumping well at 100 m and 200 m distance, respectively. The well is pumped at a uniform rate to produce steady drawdown of 5 m at X and 3 m at Y. If a non-reactive pollutant enters at the observation well Y, then the time taken by the pollutant (under advection) to reach the observation well X is __________ days. (rounded off to two decimal places)

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A pipe line O P Q R branches into three pipes X, Y, and Z between points P and Q as shown in figure (not to scale)

Diagram for Environmental Science and Engineering question 55

Diameter (d) and length (l) of each pipe are as presented in figure and all pipes are of same material having friction factor (f) of 0.02. Assume acceleration due to gravity (g) as 10.0 m/s². If the head difference between P and Q is 10 m, then the head loss between Q and R is ____________ m. (rounded off to two decimal places)

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GATE ES purpose:exam-prep PYQs

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55