Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Assertion : The amount of BOD in the water is a measure of the amount

1.	Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - b The amount of oxygen required by bacteria to breakdown the organic matter present in a certain volume of a sample of water is Biological Oxygen Demand (BOD) . Hence , higher the value of BOD, higher is the amount of organic material in the water .

Discussion

No Comment Found

Related InterviewSolutions

A sample of air turns lime water milky and also turns acidified potassium dichromate green in aqueous solution has low `pH`. This is due to the presence of pollutantsA. `CO_(2)`B. `SO_(2)`C. Both (a) and (b)D. None of these
100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of `50% H_(2)SO_(4)` for the oxidation of dissolved oxygen demand.
Assertion : Manures and biofertilizers shuld be used in place of chemical fertilizers. Reason : Chemical fertilizers cause pollution by releasing excess nutrients in water bodies.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the c orrect explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Chernobyl tragedy occurred inA. 9th May, 1945B. 26th April, 1986C. 6th Aug, 1947D. 26th May, 1966
Which of the following is`//`are the hazardous pollutant(s) present in automobile exhaust gases ?A. (ii) and (iii)B. (i) and (ii)C. (ii) and (iv)D. (i) and (iii)
The automobile vehicle pollutant isA. `H_(2)O`B. `NO_(2)`C. ParticulateD. Hydrocarbons
Which is not a pollutant from exhaust of motor vehicle?A. HydrocarbnsB. Fly ashC. `NO_(x)`D. CO
Assertion: The marble structure reacts with traces of `H_(2)SO_(4)` present in acid rain. Reason: Taj Mahal is being slowly damaged by acid rain.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
In the last decades, most serious nuclear reactor accident created MIC gas tragedy inA. Russia (1990) and Bhopal (1996)B. Ucraine (1986) and Bhopal (1984)C. Bhopal (1994) and Russia (1990)D. Ucraine and USA (1984)
Identify the wrong statement in the followingA. Greenhouse effect is responsible for global warmingB. Ozone layer does not permit infrared radiation from the sun to reach on the earthC. Acid rain is mostly because of oxides of nitrogen and sulphurD. Chlorofluorocarbons are responsible for ozone layer depletion

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment