Chemical Engineering MCQs

Page No. 51

Which of the following pollutants, if present in atmosphere is detectable by its odour ?


aCO

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bSO2

✓


c NO2

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dCO2

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View Answer SO2

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?


aLagooning

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bActivated carbon adsorption

✓


cBiological oxidation pond

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dChemical coagulation

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Pick out the correct statement ?


aChemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

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bCOD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time

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cCOD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre

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dAll A., B. and C.

✓


View Answer All A., B. and C.

When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?


a 0.01

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b0.1

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c1

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d4

✓


View Answer 4

Which is the most practical and economical method for removal of suspended solid matter from polluted water ?


aSedimentation

✓


bSkimming off

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cChlorination

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dBiological oxidation

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View Answer Sedimentation

Iron & manganese present as pollutant in water cannot be removed by__________________?


aIon exchange process

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b Oxidation followed by settling & filtration

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c Lime soda process or manganese zeolite process

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dChlorination

✓


View Answer Chlorination

In the context of the chemical process industries, the term BOD is normally associated with the_____________________?


aCharacterisation of solid wastes

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bOrganic concentration in gaseous effluents

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cCharacterisation of liquid effluents

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dCharacterisation of boiler feed water

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Pick out the wrong statement pertaining to ‘green house’ for the plants ?


a‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

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bThe emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed

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cGreen house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where

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d‘Green house’ is colder than the outside atmosphere

✓



In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?


at = 15 – 0.0065h

✓


bt = 15 + 0.0065h

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ct = 0.0035h -15

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dt = 15 – 0.0035h

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View Answer t = 15 – 0.0065h

Which of the following is the most severe air pollutant ?


aHydrocarbons

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bNOx

✓


cSO2

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dCO

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View Answer NOx

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