Hamad Chemical Environmental Engineering 29/05/2020 A. 0.1 B. 1 C. 5 D. 25 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... 80% less than 200 mesh size particles are called____________________?A. Smoke B. Powder C. Grit D. Aggregates... 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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