Hamad Chemical Environmental Engineering 24/09/2020 A. Sterilisation B. Aeration C. Disinfection D. None of these Related Mcqs: The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?A. 20 B. 230 C. 750 D. 1500... 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... World’s worst radioactive pollution was caused by nuclear reactor disaster which occured in ___________________?A. Arizona (U.S.A.) B. Chernobyl (undivided U.S.S.R.) C. Pennsylvania (U.S.A.) D. Moscow (U.S.S.R.)... TLV of lead for public sewer/waste water is about ______________ ppm?A. 1 B. 25 C. 150 D. 650... Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________?A. Blood poisoning B. Anaemia C. Nervous system disorder D. All A., B. and C....
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