Related Questions

Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
A Quantity & temperature of waste gas
B Dust concentration & nature of dust in waste gas
C Corrosive nature of the waste gas
D All of the above
In water treatment plant, zeolite process is used to remove the __________ of water.
A Acidity
B Alkalinity
C Hardness
D Iron & zinc
The most commonly used chemical coagulant in water treatment is
A Ferrous sulphate
B Alum
C Lime
D Hydrazine
Collection, Transportation and Treatment of solid waste in Dhaka city is the responsibility of—
A DCC
B DNCC and DSCC
C A & B
D None of the above
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
A Filtration
B Digestion
C Sedimentation
D Both B and C
A sink contains exactly 12 liters of water. If water is drained from the sink until it holds exactly 6 liters of water less than the quantity of water drained away, how many liters of water were drained away ?
A 2
B 3
C 9
D 6
In sewage treatment, its sedimentation is speeded up by commonly adding
A Hydrochloric acid
B Lime
C Copper sulphate
D Sodium sulphate
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
A Decreases
B Increases
C Remains constant
D May increase or decrease ; depends on the chemical characteristics of polluted water
The treatment of water with bleaching powder is known as
A Pre-chlorination
B Super chlorination
C De-chlorination
D Hypo-chlorination

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