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Chemical Engineering Objective Questions { Environmental Engineering in Chemical Engineering }



92. Ozone level is generally found to be depleted in India in the month of
A. February
B. July
C. April
D. December
Discussion
93. Infective bacteria in water is killed by the __________ process.
A. Sterilisation
B. Aeration
C. Disinfection
D. None of these
Discussion
94. Hydrogen ion concentration in distilled water is
A. 10-7
B. 7 × 10-7
C. 107
D. 7 × 107
Discussion
95. Pick out the correct statement.
A. Deforestation helps in controlling the green house effect
B. Global warming is detrimental for increase in food productivity and may cause flood and cyclone
C. Lightening discharges are natural source of production of SO2 & H2S pollutant
D. Sulphur dioxide causes death by asphyxiation
Discussion
96. Pick out the correct statement.
A. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water
B. COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time
C. COD 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
D. All of the above
Discussion
97. Insufficient washing of sand grains in a rapid sand filter causes
A. Air binding
B. Shrinkage of filtering media
C. Mud balls
D. Expansion of filtering media
Discussion
98. Presence of high concentration of ozone and smog in atmospheric air causes the
A. Embrittlement & decrease of folding resistance of paper
B. Cracking of rubber products
C. Fading of dye on textiles
D. Damage of electrical insulator on high tension power line
Discussion

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