Chemical Environmental Engineering

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?

Byadmin March 11, 2019August 29, 2021

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?

A. Natural aeration of water stream
B. Photosynthetic action of algae
C. Both A. & B.
D. Neither A. nor B.

Chemical Environmental Engineering

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?

A. 0.002
B. 0.2
C. 1.2
D. 4.8

Read More Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
Chemical Environmental Engineering

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?

A. By chemical coagulation
B. In sedimentation tanks equipped with mechanical scrapper
C. In vacuum filter
D. In clarifiers

Read More Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
Chemical Environmental Engineering

Fresh domestic sewage is _______________ in color?

Fresh domestic sewage is _______________ in color?

A. Grey
B. Dark brown
C. Red
D. Black

Read More Fresh domestic sewage is _______________ in color?
Chemical Environmental Engineering

From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?

From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?

A. 5
B. 50
C. 500
D. 5000

Read More From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
Chemical Environmental Engineering

Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?

Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?

A. Hydrogen sulphide
B. Mercury
C. Cadmium
D. Asbestos

Read More Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?
Chemical Environmental Engineering

The biological decomposition of organic substances in wastes controlled conditions is called_________________?

The biological decomposition of organic substances in wastes controlled conditions is called_________________?

A. Incineration
B. Biological oxidation
C. Composting
D. None of these

Read More The biological decomposition of organic substances in wastes controlled conditions is called_________________?

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