Related Questions

For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
A 10000
B 5
C 500
D 1000
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A 0.5
B 1
C 5
D 20
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
A 1
B 100
C Infinite
D Zero
What environmental issue involves the excessive use of fertilizers and run-off chemimls into bodies of water. causing oxygen depletion and harm to aquatic ecosystems?
A Acid rani
B Eutrophication
C Desertification
D Deforestation
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
A 3 ppm
B 4 ppm
C 5 ppm
D 10 ppm
Presence of __________ in water stream are deleterious to aquatic life.
A Soluble and toxic organics
B Suspended solids
C Heavy metals and cynides
D All of the above
If a person can save TK.380 in 5 weeks, in how many weeks, at this same rate, can the person save 2.6 times amount ?
A 13
B 12.5
C 11
D 10.6
If Mr. Azad can save Tk. 380 in five weeks , in how many weeks m at this same rate, can he save 2.6 times of this amount?
A 13 weeks
B 12.5 weeks
C 11 weeks
D 8 weeks
save ও save as অপশন দুটি ওয়ার্ডের কোন বাটনের অপশন?
A রেফারেন্স
B অফিস বাটন
C clipboard
D এডিটিং
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
A TOD > BOD > COD
B TOD > COD > BOD
C BOD > COD > TOD
D COD > BOD > TOD

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