Dashboard ► My courses ► 2401-CVL100 ► 19 November - 25 November ► Major
Started on Wednesday, 20 November 2024, 8:00 AM
State Finished
Completed on Wednesday, 20 November 2024, 9:45 AM
Time taken 1 hour 45 mins
Grade 29.40 out of 50.00 (59%)
Question 1 The presence of high chloride levels in sewage may indicate:
Correct
Select one:
Mark 1.00 out of
1.00 Organic pollution from agricultural runoff
High levels of organic nitrogen compounds
Saline groundwater infiltration or industrial discharge
Excessive nutrient load from fertilizers
The correct answer is: Saline groundwater infiltration or industrial discharge
Question 2 In a biological wastewater treatment process, a decline in temperature would most likely
Incorrect affect which of the following?
Mark 0.00 out of
Select one:
1.00
Metabolic rate of microbial populations
Filtration rate of the treatment system
Sedimentation efficiency of suspended solids
Solubility of phosphates and sulfates
The correct answer is: Metabolic rate of microbial populations
Question 3 What is the main reason for treating greywater separately from blackwater in
Correct decentralized wastewater systems?
Mark 1.00 out of
Select one:
1.00
Blackwater contains heavy metals that are absent in greywater.
Greywater is easier to treat and can be directly reused after basic filtration.
Blackwater treatment requires higher pH, making separate treatment necessary.
Greywater generally has high pathogen levels requiring specialized treatment.
The correct answer is: Greywater is easier to treat and can be directly reused after
basic filtration.
Question 4 Which of the following statements best describes the effect of suspended solids in a
Correct water body?
Mark 1.00 out of
Select one:
1.00
They mainly contribute to increasing the water’s pH level.
They decrease light penetration, affecting photosynthesis.
They provide essential nutrients for aquatic plants.
They enhance oxygenation by increasing water turbidity.
The correct answer is: They decrease light penetration, affecting photosynthesis.
Question 5
Estimate the population for a town for the year of 2035, 2045 and 2055 considering the
Partially correct following past census data as per arithmetical increase, geometrical increase and
Mark 8.40 out of incremental increase method. Also, calculate the sewage generated in the year of 2055
12.00 in million liters (ML) as per these three methods considering the water supply of 130
lpcd. Based on the calculations, fill up the answer table.
Year 1985 1995 2005 2015 2025
Population 42060 54270 67340 79821 106532
Answer table
Method Population Sewage (ML)
2035 2045 2055 2055
122650 138768 154886 7349.275
Arithmetical
Geometrical 133868 168218 211383 10029.84
increase
Incremental 127483 153267 183884 8725.296
increase
Question 6 Meteorology is the study of the Earth's atmosphere and the variations in temperature
Incorrect and moisture patterns that produce different weather conditions. A meteorologist is an
individual who is specialized in meteorology. The India Meteorological Department
Mark 0.00 out of
(IMD) is an agency of the Ministry of Earth Sciences of the Government of India which is
2.00
responsible for meteorological observations, weather forecasting and seismology in the
country. Data below shows the temperature profiles (Temperatures at different height)
recorded by IMD on three different occasions.
0
Temperature ( C)
Height (m)
Occasion1 Occasion 2 Occasion 3
0 20 20 20
10 19.9 20.1 19.8
20 19.8 20.2 19.6
30 19.7 20.3 19.4
40 19.6 20.4 19.2
50 19.5 20.5 19.4
100 19 21 20.4
200 18 22 22.4
300 17 23 24.4
500 15 25 20.4
1000 10 30 10.4
Which of the following statements is true:
Select one:
Occasion 3 closely represents the meteorological conditions in which London
smog occurred.
Occasion 1 closely represents the meteorological conditions in which London
smog occurred.
Occasion 2 closely represents the meteorological conditions in which London
smog occurred.
Occasions 1 and 2 closely represent the meteorological conditions in which
London smog occurred.
The correct answer is: Occasion 3 closely represents the meteorological conditions in
which London smog occurred.
Question 7 Due to insufficient control of emissions from a rapid increase in industries, urbanization,
Incorrect and energy consumption, health effects associated with air pollution in India are severe.
As per National Green Tribunal (NGT), understanding the assimilative carrying capacity
Mark 0.00 out of
of air in a city is imminent to plan any further expansion or formulating air quality control
5.00 2
action plans for a city. Indore, which covers an area of 1201.85 km and houses 15.56
million people, is one of the vastly developing smart cities in India. NGT has entrusted a
group of IIT Delhi students to study the air quality of Indore. This group thoroughly
studied the air quality of Indore and prepared an inventory of all emissions contributing
to PM10 from various sources in the city. Few excerpts from the inventory are: 1)
Vehicles and road dust are the dominating source with emissions of 2268.21 and
5258.10 metric ton/year, respectively 2) Industries, construction, diesel generators emit
50.10, 71.78 and 12.02, metric ton/year, respectively. The yearly averaged PM10
3
concentrations of Indore city as per the CPCB’s website is 94.02 µg/m . Meteorological
data measured by this group revealed that yearly averaged wind speed, direction,
0
mixing layer height and temperature are 3.96 m/s, 303.92 , 506.96 m and 36.46°C,
respectively. The estimated assimilative PM10 carrying capacity (in Metric Ton,
Rounded off to three decimals) of Indore city in this report would be
Answer: 438817.9
The correct answer is: 36.557
Question 8 Which of the following pollutants are most likely to accumulate in the food chain, leading
Correct to biomagnification?
Mark 1.00 out of
Select one:
1.00
Volatile organic compounds (VOCs)
Suspended organic solids
Biorefractory pollutants like PAHs
Pathogens like bacteria and viruses
The correct answer is: Biorefractory pollutants like PAHs
Question 9 Air quality in New Delhi is rarely below Central Pollution Control Board (CPCB) air
Incorrect quality standards and WHO guidelines. To study the air quality in the hostel premises,
an enthusiastic UG student approached the house working committee (HWC) of the
Mark 0.00 out of
hostel in IITD to sanction funds to procure Airvedae Abs PM2.5, PM10 Accuracy Smart
2.00
Air Quality Monitor with Laser Sensor from Amazon.com. HWC after thorough
deliberations appreciated the student’s efforts and recommended the purchase of this
PM2.5 and PM10 sensor worth ~Rs. 9,500 through Dean Discretionary Fund (DDF).
This recommendation was promptly approved by the Dean of Student Affairs, IITD. This
enthusiastic student following the guidelines learnt in this class set up this sensor at 3 m
above the ground and 0.5 m from the curb in the hostel garden. PM2.5 and PM10
concentrations measured using the sensor, which was saved real time on the cloud,
was analyzed by this student. After meticulous analysis, student concluded that the
3
yearly average PM2.5 and PM10 concentrations were 100 and 120 µg/m , respectively.
This data was sent to CPCB, through competent authority of IITD, for their regulatory
feedback. Which of the following options closely reflect the expected reply from CPCB?
Select one:
Both yearly averaged PM2.5 and PM10 concentrations exceed the
corresponding CPCB standard in this area
While yearly averaged PM2.5 concentrations exceed the corresponding CPCB
standard, PM10 concentrations does not exceed the corresponding CPCB standard
Neither yearly averaged PM2.5 nor PM10 concentrations exceed the
corresponding CPCB standard in this area
None of the other options
While yearly averaged PM10 concentrations exceed the corresponding CPCB
standard, yearly averaged PM2.5 concentrations does not exceed the
corresponding CPCB standard
The correct answer is: None of the other options
Question 10 Stubble burning is a big menace to air quality in north India. In this, the straw stubble
Correct that remains after grains, such as rice and wheat, have been harvested, is intentionally
set up on fire. As per literature, the average yield of wheat from an agricultural field is
Mark 8.00 out of
4162 kg/hectares, the stubble produced is 1.5 times the yield, and the amount of PM10
8.00
released is 40 µg/kg-s of stubble burnt. You have been hired to estimate the
3
concentration of PM10 (Units: µg/m , Rounded off to 3 decimals) at school, which is 20
m direct downwind (and along the plume centreline) to an agricultural field (Area= 100
sq m) in north India, on a day with heavily overcast skies and wind speed of 2 m/s. For
simplicity assume the equation used in this course is valid and it is a ground level
emission.
a) The Pasquill stability class is
B
F
E
C
A
D
b) The ratio of Plume spread parameters (S /S ) is (Rounded off to 2 decimals)
y z
8.34
3
c) Estimated PM10 concentration (Units: µg/m , Rounded off to 3 decimals) at the
school is 781.956
Question 11 The presence of high chloride levels in sewage may indicate:
Correct
Select one:
Mark 1.00 out of
1.00 Organic pollution from agricultural runoff
High levels of organic nitrogen compounds
Saline groundwater infiltration or industrial discharge
Excessive nutrient load from fertilizers
The correct answer is: Saline groundwater infiltration or industrial discharge
Question 12
For any construction or demolition activity to proceed, obtaining environmental
Incorrect clearance (EC) is mandatory, either from the relevant State or Central Ministry of
Mark 0.00 out of Environment. As part of the EC of the twelve-story building on the Sonipat campus of IIT
1.00 Delhi, the Haryana Ministry of Environment required IIT Delhi to install a monitoring
station on the roof of the upcoming building. IIT Delhi complied by setting up the station,
which houses an UV photometric method based ozone analyzer. A student utilized this
collected ozone data to estimate probable human exposure concentrations. Is the
student's approach correct or flawed?
Select one:
Correct
Flawed
The correct answer is: Flawed
Question 13 An N95 mask is a type of respirator known for its high filtration efficiency against
Incorrect airborne particles, capable of filtering 95% of fine particles. When a student was asked
to explain how this mask functions, the response was "sieving", suggesting that
Mark 0.00 out of
particles larger than the mask's pore size are only filtered out. Does the student's
1.00
explanation accurately describe the mask’s filtration mechanism?
Select one:
Yes
No
The correct answer is: No
Question 14 Match the following:
Correct
Mark 3.00 out of Flue gas desulfurization Lime
3.00
Catalytic converter Palladium
Cyclone Separator Centrifugal force
The correct answer is: Flue gas desulfurization → Lime, Catalytic converter →
Palladium, Cyclone Separator → Centrifugal force
Question 15
The past population of a city in three consecutive decades, i.e., in year 2000, 2010 and
Partially correct 2020 was 51,000; 89,000 and 120,000, respectively. Using logistic curve method
Mark 5.00 out of determine (a) the saturation population 147214 (b) the expected
10.00
population in 2030 136449 (c) Find the total sewage generated in 2030
(million liters) 6474.505 (d) The maximum sewage that the city can
generate in a year (in million liters) 6985.304 . Consider the per capita
water demand as 130 lpcd.
◄ Quiz 3
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