Environment Important MCQ
2022 [Even]
1.
The fire demand of a city may be worked out by.
a) Kuichling’s formula
b) Freeman formula
c) Buston’s formula
d) All of the above
2.
B.O.D of treated drinking water should be
a) 10ppm
b) 25ppm
c) 20ppm
d) Nil
3.
Which among the following is not the physical characteristics of
water?
a) Turbidity
b)
Specific conductance
c) Hardness
d) Temperature
4.
When fineness of sand used as a filter media increases
a) The rate of filtration increases
b) Efficiency of turbidity and bacteria removal increases
c) The rate of filtration and its efficiency remains constant
d) None of these
5.
Choose the option which correctly indicates the function of relevant
valves?
a) Scour valves-for venting out air pockets
b) Check valves – to flush out debris sediments
c) Air release valves – prevent water to flow back
d) Sluice valves -regulate the flow of water
6.
Sullage refers to the waste water generated from-
a) Kitchen and Bathroom
b) Urinals and water closets
c) Industrial establishments
d) All of the above
7.
Which of the following factor should be considered before selecting
material for manufacturing sewer pipes?
a) Imperviousness’
b) Economy and costs
c) Weight of the material
d) All of the above
8.
The inlets which are provided to carry the surface runoff to the sewers is
termed as
a) Clean outs
b) Inverted syphon
c) Gullies
d) Sluice gate
9.
In general, the objective of the domestic waste water treatment is to bring
down BOD less than ……… for disposal into land water bodies
a) 300 mg/L
b) 3 mg/L
c) 30 mg/L
d) 0.3 mg/L
10.
Which of the following is anaerobic treatment unit
a) Trickling filter
b) Primary settling tank
c) Activated sludge process
d) Septic tank
11.
Algae bacteria symbiotic relationship is utilized for sewage treatment
in
a) Activated sludge process
b) Trickling filter
c) Oxidation Pond
d) Classification
12.
Which of the following is not considered as primary air pollution?
a) Sulphur dioxide
b) Carbon monoxide
c) Ozone
d) Hydrocarbons
13.
Acid rain is primarily caused due to-
a) Global warming
b) Fossil fuels
c) Deforestation
d) Pathogens
14.
What are the major compositions of landfill has generated by the action of
microorganisms on landfill
a) Hydrogen and nitrogen
b) Methane and carbon dioxide
c) Methane and ethane
d) Carbon dioxide and carbon monoxide
15.
The control of environmental factors that are connected to disease
transmission is termed as-
a) Sewage treatment
b) Environmental sanitation
c) Ecological balance
d) Environmental hygiene
16.
The intake structures must never be located
a) At the upstream water body
b) In vicinity of the point at wastewater disposal
c) Near treatment plant
d) In the purer zone of the source
17.
Maximum hourly demand of maximum day demand i.e., peak demand is equal
to
a) 1.5
×
average hourly demand
b) 2.7 × average hourly demand
c) 2.5 × average hourly demand
d) None of these
18.
Which of the following is /are poisonous to human health?
a) Arsenic
b) Selenium
c) Iron
d) Both (a) and (b)
19.
Excess of which of the following substance causes blue baby syndrome?
a) Fluorides
b) Nitrates
c) Sulphates
d) Chlorides
20.
Given that four machines produce sound of 100 dB each, what is the total
sound pressure level?
a) 400 dB
b) 103 dB
c) 106 dB
d) 104 dB
21.
Per capita water demand is calculated in litres……
a) Per person per day
b) Per person per hour
c) Both (a) and (b)
d) None of these
22.
As compared to geometrical increase method of forecasting population,
arithmetical increase method gives-
a) Higher value
b) Lesser value
c) Same value
d) All of the above
23.
The devices installed for drawing water from the sources are called
a) Intakes
b) Filters
c) Outlets
d) Aquifers
24.
Water that occurs below the surface of the earth is called
a) Surface water
b) Subsurface water
c) Both (a) and (b)
d) None of these
25.
Manhole covers are usually made of
a) Cast iron
b) Cement
c) Wood
d) All of the above
26.
PH value representing a stronger acid is:
a) 1
b) 2
c) 5
d) 10
27.
Permanent hardness of water may be removed by:
a) Lime soda process
b) Demineralization process
c) Both (a) and (b)
d) None of these
28.
Which of the following chemical may be used for disinfection of
water?
a) Chlorine
b) Ozone
c) Chlorine -ammonia
d) Any of the above
29.
The factor/factors affecting per capita demand of water is/are:
a) Size of city
b) Quality of water
c) Climatic condition
d) All of the above
30.
The first stage of water treatment is:
a) Coagulation
b) Filtration
c) Disinfection
d) Screening
31.
Most common surface water supply source is:
a) Sea
b) River
c) Both (a) and (b)
d) None of these
32.
Liquid wastes from kitchens and bathrooms is called:
a) Rubbish
b) Garbage
c) Refuse
d) Sullage
33.
The permissible amount of nitrates present in potable water is
a) Nil
b) 10 ppm
c) 20 ppm
d) 30 ppm
34.
Trickling filters are used to remove:
a) Suspended solids
b) Organic matter
c) Both (a) and (b)
d) None of these
35.
Fresh sewage is usually:
a) Neutral
b) Acidic
c) Alkaline
d) None of these
36.
In septic tank, the decomposition of organic matters is done by:
a) Aerobic bacteria
b) Anaerobic bacteria
c) Both (a) and (b)
d) None of these
37.
Air pollutants common to urban environment are:
a) Sulphur dioxide
b) Hydrocarbon
c) Particulate matter
d) All of the above
38.
If organic matter increases in sewages, the demand of oxygen will:
a) Increase
b) Decrease
c) Remains constant
d) None of these
39.
B.O.D means:
a) Biological oxygen demand
b) Biological ozone demand
c) Biochemical oxygen demand
d) All of the above
40.
The growth of algae is useful in…….
a) Slow sand filter
b) Oxidation Pond
c) Both (a) and (b)
d) None of these
41.
Ground water is usually free from:
a) Suspended impurities
b) Dissolved impurities
c) Both (a) and (b)
d) None of these
42.
Factor affecting rate of water demands are
a) Climate condition
b) Cost of water
c) Habits of people
d) All of the above
43.
The valve which allows the flow in one direction is a …………
a) Reflux valve
b) Sluice valve
c) Scour valve
d) None of these
44.
The modern turbidimeter working on the principle of scattering of light is
known as………….
a) Spectrometer
b) Optimeter
c) Tinometer
d) Nephelometer
45.
P.V.C pipes can withstand pressure upto……..
a) 20 m head of water
b) 50 m head of water
c) 100 m head of water
d) 150 m head of water
46.
In septic tank, the decomposition of organic matter is done by……
a) Aerobic bacteria
b) Anaerobic bacteria
c) Pathogenic bacteria
d) None of these
47.
If organic matter increases in sewage, the demand of oxygen will…………
a) Increase
b) Decrease
c) Remain constant
d) None of these
48.
Grit is composed mostly of …………
a) Grease
b) Paper
c) Sand
d) Wood
49.
The treatment of water with bleaching powder is known as…………
a) Pre chlorination
b) Super chlorination
c) Dichlorination
d) Hypo chlorination
50.
The main disadvantage of cement concrete sewer is ……………...
a) Less strength
b) Difficulty in construction
c) Difficulty in transportation due to heavy weight
d) None of these
51.
The detention period for plain sedimentation tank usually ranges
from……………
a) 2 to 4 hours
b) 4 to 8 hours
c) 8 to 12 hours
d) 12 to 14 hours
52.
The water of river has an important property called……...
a) Turbidity
b) Self-purification
c) Permeability
d) Infiltration capacity
53.
The maximum permissible colour for domestic supplies based on cobalt scale
is……………...
a) 5 ppm
b) 10 ppm
c) 20 ppm
d) 50 ppm
54.
Air pollutants common to urban environment are………….
a) Sulphur dioxide
b) Particulate matter
c) Hydrocarbon
d) All of these
55.
The temporary hardness of water can be removed by……………...
a) Boiling
b) Adding lime
c) Adding alum
d) Filtration
56.
The average domestic consumption of water per capita per day is taken
as……………
a) 115 litres
b) 125 litres
c) 135 litres
d) 150 litres
57.
Water losses in water supply system are taken as:
a) 5-10%
b) 10-20%
c) 20-30%
d) 30-40%
58.
Rapid gravity filters removes bacteria to as much as…………….
a) 80-90%
b) 90-95%
c) 98-99%
d) None of these
59.
The maximum permissible limit of sulphates in domestic water supplies
is………….
a) 100 mg/
b) 200 mg/
c)
500
mg/
d) 1000 mg/
60.
A check value is also known as……………
a) Relief valve
b) Reflux valve
c) Blow off valve
d) None of these
61.
Air pollution common to urban environment are:
a) Sulphur dioxide
b) Particulate matter
c) Hydro carbon
d) All of the above
62.
The acid rains are caused by the following pollutants:
a) SO2 and O3
b) SO2 and NOX
c) NOX and O3
d) CO and SO2
63.
Pollutants in air can be in the form of:
a) Particulates
b) Microorganisms
c) Gases
d) Any of the above
64.
Which one of the following solid waste disposal methods is ecologically
most acceptable.
a) Sanitary land fill
b) Incineration
c) Composition
d) Pyrolysis
65.
Upper limit of chloride content in portable water is
a) 100 ppm
b) 200 ppm
c) 250 ppm
d) 300 ppm
66.
The effective size of sand particles used in slow sand filters is:
a) 0.25 mm to 0.35 mm
b) 0.35 mm to 0.60 mm
c) 0.60 mm to 1.00 mm
d) All of the above
67.
The turbidity is measured by:
a) Standard silica scale
b) Standard cobalt scale
c) Standard Platinum scale
d) Platinum cobalt scale
68.
Zero hardness of water is achieved by
a) Using lime soda process
b) Excess lime process
c) Ion exchange method
d) Using excess alum dose
69.
The suitable layout of a distribution system for irregularly growing town
is:
a) Dead end system
b) Grid iron system
c) Radical system
d) Ring system
70.
The percentage of chlorine in fresh bleaching powder is about:
a) 10 to 15
b) 20 to 25
c) 30 to 35
d) 40 to 50
71.
First stage of water treatment is
a) Coagulation and mixing
b) Sedimentation
c) Filtration
d) Disinfection
72.
A sewer that collects sewage from toilets is called
a) Lateral
b) Branch sewer
c) Main sewer
d) Outfall sewer
73.
Before entering a manhole, a candle is lowered into the manhole
to………….
a) Illuminate it
b) Detect toxic gases
c) Find out presence of oxygen
d) All of the above
74.
Septic tanks are the best suited for:
a) Municipalities
b) Industries
c) Scattered residences
d) Congested areas
75.
Disinfections is the process of ……………….
a) Killing all bacteria
b) Removal of cansative organism for disease
c) Complete destruction of life
d) Killing only pathogenic bacteria
76.
Sewage is……………
a) Waste water from bathroom
b) Drainage from roads
c) Waste water from kitchen
d) Any waste water of domestic or Industrial origin
77.
B.O.D represents:
a) Pollution strength of a waste
b) pollution strength of an organic fraction of waste
c) pollution strength of inorganic fraction of wastes
d) pollution strength of Bio degradable organic wastes.
78.
B.O.D test in India is standardised at:
a) 10°C and 10 days
b) 20°C and 5 days
c) 37°C and 3 days
d) 50°C and 2 days
79.
The activity that may not affect ecological balance is:
a) Growing crops
b) Developing gardens
c) Industries
d) Both (a) and (b)
80.
The primary pollutant caused by incomplete combustion of organic matter
is:
a) Ozone
b) Carbon mono oxide
c) Sulphur dioxide
d) None of the above
81.
Pollutants in air can be in the form of:
a) Particulates
b) Microorganisms
c) Hydrocarbon
d) All of these
82.
Two sources generate noise level of 90 dB & 94 db. The resultant effect
of these noise level on the human ear is:
a) 184 dB
b) 95.5 dB
c) 94 dB
d) 92 dB
83.
Which of the following industry is least polluting?
a) Electronic industry
b) Cement industry
c) Rolling mills
d) Thermal power plant
84.
Which of the following is not a major indoor pollutant in a developing
country like India, in the rural areas?
a) Cooking and heating activities
b) Burning of cow dung
c) Burning of crop waste
d) Building material
85.
The turbidity in water is caused due to
a) Silt
b) Clay
c) Finely divided organic matter
d) All of these
86.
Per capita per demand is calculated in litres:
a) Per person per day
b) Per person per week
c) Per person per month
d) Per person per hours
87.
The most common surface water supply source is:
a) Sea
b) River
c) Pond
d) All of the above
88.
G.I pipe has a coating of
a) Zinc
b) Lead
c) Silver
d) Aluminium
89.
The device which is installed for drawing water from the source is
called:
a) Aquifer
b) Aquiflude
c) Filter
d) Intake
90.
First stage of water treatment is:
a) Coagulation and mixing
b) Filtration
c) Disinfection
d) Sedimentation
91.
The treatment of water with bleaching powder is known as:
a) Pre chlorination
b) Super chlorination
c) Dechlorination
d) Hypo chlorination
92.
The type of value which is provided to control the flow of water in the
distribution system at street corners and where the pipe lines intersect
is:
a) Check valve
b) Sluice valve
c) Safety valve
d) Scour valve
93.
The main disadvantage of cement concrete sewer is:
a) Less strength
b) Difficulty in construction
c) Difficulty in transportation due to heavy weight
d) None of these
94.
The minimum dissolved oxygen which should always be present in water in
order to save the aquatic type is:
a) 2 ppm
b) 4 ppm
c) 10 ppm
d) 10 ppm
95.
The pathogens can be killed by:
a) Nitrification
b) Chlorination
c) Oxidation
d) None of these
96.
The ratio of 5 days B.O.D to ultimate B.O.D is about
a) ½
b) 2/3
c) 1
d) None of these
97.
A pipe which is installed in the house drainage to preserve the water seal
of traps is called:
a) Vent pipe
b) Waste pipe
c) Soil Pipe
d) Ant siphonage pipe
98.
Normally the capacity of flushing cisterns for water closets is:
a) 2 to 5 litres
b) 6 to 8 litres
c) 10 to 15 litres⇩
d) None of these
99.
As compared to cast iron pipes, steel pipes are:
a) Stronger
b) Heavier
c) Weaker
d) None of these
100.
Which of the following compound is widely used for algae control?
a) Sodium sulphate
b) Copper sulphate
c) Sodium chloride
d) Calcium chloride
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