Dissolved oxygen content in river water is around __________ ppm.

More Questions from Environmental Engineering

• World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
• Industrial workers working in leather tanning & manufacturing units are prone to suffer from
• Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
• Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
• Nitrogen oxides (NOx) is not produced in the __________ industry.
• Peroxyacyl nitrate (PAN), a pollutant is found in the
• Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
• Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
• Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
• Presence of bacteria in potable (drinking) water causes

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