Related Questions

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
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
Bromine content in sea water may be around __________ ppm.
A 70
B 640
C 1875
D 2500
শাকিলের প্রস্তুতকৃত দ্রবণের i. ppm একক হবে 40000 ppm ii. মধ্যে আরো 10 mL পানিযোগে সেমিমোেলারে পরিণত হবে iii. মধ্যে 6.02 × 1022 টি NaOH অণু রয়েছে নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
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
If Bashar can run around a ground four times in 20 minutes and Rahim can run around the same ground three times in 12 minutes, who can run around that ground more times in an hour, and how many times more can he run around ?
A Bashar, three times more
B Rahim , three times more
C They both go around 12 times
D Bashar, eight times more
Each of the following problem has a question and two statements which are labeled 1. and. Use the data given in 1. and 2. to decide whether the statements are sufficient to answer the question.Select one of the following . a.Statements (1) ALONE is sufficient,but (2) ALONE is not sufficient. b.Statements (2) ALONE is sufficient,but (1) ALONE is not sufficient. c. Both statement TOGETHER are sufficient but statement alone is sufficient . A fly crawls around the outside of a circle once.A second fly crawls around the outside of a square once.Which fly travels further ? (1) The diagonal of the square is equal to the diagonal of the circle.(2) The fly crawling around the circle took more time to complete has journey than the fly cawing around the square.
A A
B B
C C
D D
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
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
A 50
B 500
C 1000
D 3000 (i.e. 0.3%)
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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