1. 5.50 What do the initials UEL stand for?1) a. Upper environmental level
2) b. Unknown environmental level
3) c. Upper explosive limit
4) d. Unknown explosive levels
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2. 5.56 What is the current exposure limit for benzene (8 hour time weighted average)?1) a. 10 ppm
2) b. 3 ppm
3) c. 5 ppm
4) d. 1 ppm
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3. 5.28 Why is it important to wear gloves while sampling?1) a. So that the sample is not contaminated
2) b. To prevent your hands becoming dirty
3) c. To prevent hazardous substances being absorbed through the skin
4) d. Answers a., b. and c. are all correct
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4. 5.81 What is the maximum permissible 8 hour TWA (time weighted average) exposure level of H2S?1) a. 30 ppm (60 ppm in USA)
2) b. 25 ppm (50 ppm in USA)
3) c. 15 ppm (20 ppm in USA)
4) d. 5 ppm (10 ppm in USA)
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5. 5.77 What are the characteristics of hydrogen sulfide?1) a. It is a pale yellow gas with a sweetish taste and strong pungent odour
2) b. It is a pale yellow gas with the odour of rotten eggs
3) c. It is a colourless gas with a sweetish taste and the odour of rotten eggs
4) d. It is a colourless gas with little or no odour
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