Related Questions

A. some towns in Bangladesh are polluted B. All polluted towns should be destroyed C. Town Dhaka should be destroyed D. Town Dhaka is polluted E. Some towns in Bangladesh should be destroyed
A BDE
B BAE
C ADE
D CDB
Each question consists of five statements following by options consisting of three statements put together in a specific order. Choose the option which indicates a valid argument, that is, where the third statement is a conclusion drawn from the preceding two statements. A.Some towns in Bangladesh are polluted .B.All polluted towns should be destroyed.C.Town Dhaka should be destroyed.D.Town Dhaka is polluted.E.Some towns in Bangladesh should be destroyed
A BDE
B BAE
C ADE
D CDB
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 receptionist at a veterinary clinic reviewed the office records and found that 3 out of every 8 animals treated at the clinic during the last 4 months were cats. At this rate, how many cats will be treated during the next 12 weeks if a total 288 animals are treated ?
A 108
B 96
C 36
D 24
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
Which is the most practical and economical method for removal of suspended solid matter from polluted water?
A Sedimentation
B Skimming off
C Chlorination
D Biological oxidation
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
A Sedimentation tank
B Circular clarifier
C Mechanical flocculation
D Chemical coagulation
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by
A Solvent extraction
B Continuous distillation
C Evaporation
D Absorption
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
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
A Fire hazards
B Explosion hazards
C Persistent foam
D Depletion of dissolved oxygen

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