$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:
- Amore than $17 \ ppm$
- Bequal to $10 \ ppm$
- Cequal to $5 \ ppm$
- Dless than $5 \ ppm$
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Similar Questions
The irritant red haze in traffic and congested places is due to the presence of which of the following?
$(i)$ Oxides of sulphur
$(ii)$ Oxides of nitrogen
$(iii)$ Carbon dioxide
$(iv)$ Mists,smoke and dust
$(v)$ Smog
$(i)$ Oxides of sulphur
$(ii)$ Oxides of nitrogen
$(iii)$ Carbon dioxide
$(iv)$ Mists,smoke and dust
$(v)$ Smog
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View SolutionWhich one of the following depletes the ozone layer?
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View SolutionMatch the particulate pollutants given in List-$I$ with their descriptions given in List-$II$.
List-$I$ List-$II$ $(A)$ Smoke $(1)$ Formed by condensation of vapours during chemical reactions. $(B)$ Dust $(2)$ Fine solid particles. $(C)$ Mist $(3)$ Produced by particles of spray liquids and by condensation of vapours. $(D)$ Fumes $(4)$ Mixture of solid and liquid particles formed by combustion of organic matter.
| List-$I$ | List-$II$ |
|---|---|
| $(A)$ Smoke | $(1)$ Formed by condensation of vapours during chemical reactions. |
| $(B)$ Dust | $(2)$ Fine solid particles. |
| $(C)$ Mist | $(3)$ Produced by particles of spray liquids and by condensation of vapours. |
| $(D)$ Fumes | $(4)$ Mixture of solid and liquid particles formed by combustion of organic matter. |
Oxides of sulfur and nitrogen are pollutants of which of the following?
Easy
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