WorksheetsEnvironmental Engineering
Total questions: 30
Worksheet time: 15mins
Suspended solids are measured by which of the following?
Turbidity rod
Gravimetric test
Chromatography
Jackson’s turbidity meter
Which method is used to measure the color of water?
Gravimetric analysis
Chromatography
Tintometer method
Hydrometer analysis
Which of the following process is used to remove the colloidal particles from water?
Chemical precipitation
Chemical coagulation
Ion exchange
Adsorption
Organic contaminants are removed from the water by the process of ______
Water softening
Demineralization
Absorption
Adsorption
Which of the following represents the physical characteristics of water?
Chloride content
BOD
Turbidity
COD
Which of the following instrument is used to measure turbidity?
Olfactometer
Turbidity meter
Colorimeter
Spectrophotometer
Which color indicates the fresh sewage?
Pink
Red
Black
Grey
The wastewater from the kitchen is an example of __________
Black water
Yellow water
Green water
Grey water
The permissible concentration of PM 10 in the air is ___________
60μg/m3
40μg/m3
50μg/m3
20μg/m3
The dilution factor is expressed by _____________
Volume of diluted sample + Volume of sewage
Volume of diluted sample / Volume of sewage
Volume of diluted sample – Volume of sewage
Volume of diluted sample* Volume of sewage
The tolerance limit of pH value of sewage to be discharged into sea water is ____________
1-5ppm
2-9ppm
5.5-9ppm
6-10ppm
. _______ is the velocity at which the solid matter in sewage remained in suspended form
Settling velocity
Self cleansing velocity
Mean velocity
Non Scouring velocity
The design period adopted for designing a water distribution system is generally
1 year
30 years
50 years
100 years
The correct relation between BOD, COD and TOD is
TOD > BOD>COD
TOD>COD>BOD
BOD>COD>TOD
COD>BOD>TOD
Which of the following statements define Environmental Engineering?
Creation of procedures and infrastructure for water delivery
Waste disposal
Pollution control of various kinds
All of the mentioned
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
house sewer
lateral sewer
intercepting sewer
submain sewer
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
separate system
combined system
partially combined system
partially separate system
Average rate of water consumption per head per day as per Indian Standard is
100 litres
135 litres
165 litres
200 litres
The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
separate system
combined system
partially separate system
partially combined system
The minimum and maximum diameters of sewer shall preferably be
15 and 100 cm
15 cm and 300 cm
30 cm and 450 cm
60 cm and 300 cm
The type of sewer which is suitable for both combined and separate system is
circular sewer
egg shaped sewer
horse-shoe type sewer
semi-elliptical
The pathogens can be killed by
nitrification
chlorination
oxidation
none of the above
Standard BOD is measured at
a) 200C – 1 day
b) 250C – 3 day
c) 200C – 5 day
d) 300C – 5 day
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
a) 1ppm
b) 4ppm
c) 10ppm
d) 40ppm
The means of access for inspection and cleaning of sewer line is known as
a) inlet
b) manhole
c) drop manhole
d) catch basin
If the sewage contains grease and fatty oils, these are removed in
a) grit chambers
b) detritus tanks
c) skimming tanks
d) sedimentations tanks
Generally the detention period for grit chambers is kept as
a) 1 minute
b) 5 minute
c) 2 -4 hours
d) 12 hours
The maximum efficiency of BOD removal is achieved in
a) oxidation pond
b) oxidation ditch
c) aerated lagoons
d) trickling filters
The pipe which is used to carry the discharge from sanitary fittings like bathrooms, kitchens etc. is called
a) waste pipe
b) soil pipe
c) vent pipe
d) antisiphonage pipe
In the design of grit chambers
a) baffles are essential
b) temperature is an important factor
c) the detention period should be at least 30 minutes
d) the maximum velocity of flow is 30 cm per second
