Question : The potential for air pollution increases when the ventilation coefficient is:
Option 1: > 11,000 m2/s
Option 2: > 7,600 m2/s
Option 3: < 3,600 m2/s
Option 4: < 6,000 m2/s
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Correct Answer: < 6,000 m2/s
Solution : The correct answer is < 6,000 m2/s.
When the ventilation coefficient reaches 6,000 m2/s, the possibility of air pollution increases. The ventilation coefficient measures the capacity of the atmosphere to diffuse and dilute pollutants. It is computed by multiplying the mixing depth by the average wind speed. A low ventilation coefficient indicates that the environment is not as effective in dispersing and diluting pollutants, which can result in a buildup of pollutants in the air, and raise the danger of air pollution.
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Question : Find $\frac{1}{21}$th of the volume of a hemisphere whose radius is 4.2 m.
Option 1: 6.6 m3
Option 2: 7.3 m3
Option 3: 8.2 m3
Option 4: 7.1 m3
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Option 1: 2 m2
Option 2: 1 m2
Option 3: 9 m2
Option 4: 4 m2
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Option 2: 1873.487 m3
Option 3: 1693.563 m3
Option 4: 1783.723 m3
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Option 1: 1278 m3
Option 2: 1872 m3
Option 3: 1827 m3
Option 4: 1728 m3
Question : The ambient air quality standards (24 hours average) for lead in industrial areas are:
Option 1: 0.65 µg/m3
Option 2: 0.75 µg/m3
Option 3: 1.0 µg/m3
Option 4: 1.5 µg/m3
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