Environmental Engineering MCQs | Environmental Engineering MCQS and Answers for competitive exams | set 5

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Questions
81 The per capital consumption of a locality is affected by i) climatic conditions ii) quality of water iii) distribution pressure The correct answer is
A only (i)
B both (i) and (ii)
C both (i) and (iii)
D all (i), (ii) and (iii)

Answer: all (i), (ii) and (iii)
82 The hourly variation factor is usually taken as
A 1.5
B 1.8
C 2.0
D 2.7

Answer: 1.5
83 The distribution mains are designed for
A Maximum Daily Demand
B Maximum Hourly Demand
C Average Daily Demand
D Maximum Hourly Demand On Maxi¬Mum Day

Answer: Maximum Hourly Demand On Maxi¬Mum Day

Environmental Pollution – Multiple Choice Questions with Answers | EBook

84 As compared to geometrical increase method of forecasting population, arithmetical increase method gives
A Lesser Value
B Higher Value
C Same Value
D Accurate Value

Answer: Lesser Value
85 The suitable method of forecasting popu¬lation for a young and rapidly increasing city is
A Arithmetical Increase Method
B Geometrical Increase Method
C Incremental Increase Method
D Graphical Method

Answer: Geometrical Increase Method
86 The depression of water table in a well due to pumping will be maximum
A At A Distance R From The Well
B Close To The Well
C At A Distance R/2 From The Well
D None Of The Above

Answer: Close To The Well
87 The devices which are installed for drawing water from the sources are called
A Aquifers
B Aquiclude
C Filters
D Intakes

Answer: Intakes
88 The type of valve, which is provided on the suction pipe in a tube-well, is
A Air Relief Valve
B Reflux Valve
C Pressure Relief Valve
D Sluice Valve

Answer: Reflux Valve
89 As compared to shallow-wells, deep wells have
A More Depth
B Less Depth
C More Discharge
D Less Discharge

Answer: More Discharge
90 Ground water is usually free from
A Suspended Impurities
B Dissolved Impurities
C Both Suspended And Dissolved Impuri¬Ties
D None Of The Above

Answer: Suspended Impurities
91 The polluted water is one which
A Contains Pathogenic Bacteria
B Consists Of Undesirable Substances Rendering It Unfit For Drinking And Domestic Use
C Is Safe And Suitable For Drinking And Domestic Use
D Is Contaminated

Answer: Consists Of Undesirable Substances Rendering It Unfit For Drinking And Domestic Use
92 The phenolic compounds in public water supply should not be more than
A 0.1 ppm
B 0.01 ppm
C 0.001 ppm
D 0.0001 ppm

Answer: 0.001 ppm
93 Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
A Hardness In Water
B Turbidity In Water
C Dissolved Oxygen In Water
D Residual Chlorine In Water

Answer: Hardness In Water
94 Alkalinity in water is expressed as milli-grams per litre in terms of equivalent
A Calcium Carbonate
B Magnesium Carbonate
C Sodium Carbonate
D Calcium Hydroxide

Answer: Calcium Carbonate
95 Residual chlorine in water is determined by
A Starch Iodide Method
B Orthotolidine Method
C Both (A) And (B)
D None Of The Above

Answer: Both (A) And (B)
96 If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
A Total Alkalinity
B Total Hardness
C Total Hardness - Total Alkalinity
D Non Carbonate Hardness

Answer: Total Alkalinity
97 The velocity of flow of water in a sedimentation tank is about
A 5 to 10 cm/sec
B 15 to 30 cm/sec
C 15 to 30 cm/minute
D 15 to 30 cm/hour

Answer: 15 to 30 cm/minute
98 The overflow rate for plain sedimentation tanks is about
A 500 to 750 litres/hour/ m2
B 1000 to 1250 litres/hour/ m2
C 1250 to 1500 litres/hour/m2
D 1500 to 2000 litres/hour/m2

Answer: 500 to 750 litres/hour/ m2
99 Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
A 10 to 25
B 50
C 75
D 100

Answer: 75
100 The settling velocity of a particle in a sedimentation tank depends on
A Depth Of Tank
B Surface Area Of Tank
C Both Depth And Surface Area Of Tank
D None Of The Above

Answer: Surface Area Of Tank
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