- A. Catalytic conversion
- B. Green house effect
- C. Global warming
- D. Both B and C
Environmental Engineering in CE
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The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the_____.
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The earth’s atmosphere is an envelope of gases present upto a height of about _____ kms.
- A. 10
- B. 200
- C. 1000
- D. 2000
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Permissible safe limit (TLV) of _____ toxic gas is 100-1000 parts per million (ppm).
- A. Highly
- B. Moderately
- C. Extremely
- D. Very extremely
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_____ substances present in sewage are removed in grit chamber during sewage treatment.
- A. Organic
- B. Fatty
- C. Inorganic
- D. Dissolved
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Oil and grease present in an emulsified state in waste water discharged from industries can be removed by_____.
- A. Biological oxidation
- B. Skimming off
- C. Settling out using chemical reagents
- D. Chlorination
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Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?
- A. NOx
- B. Hg
- C. SO₂
- D. F
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Higher concentration of nitrogen dioxide in atmospheric air causes_____.
- A. Cancer
- B. Bronchitis
- C. Asphyxiation
- D. Corrosion
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The most commonly used chemical coagulant in water treatment is_____.
- A. Ferrous sulphate
- B. Alum
- C. Lime
- D. Hydrazine
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Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?
- A. I-131
- B. Sr-90
- C. Au-198
- D. Ra-226
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Maximum allowable concentration of CO₂ in air for safe working is _____ ppm (parts per million).
- A. 50
- B. 1000
- C. 2000
- D. 5000