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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Correct Answer: 1.5 µg/m3
Solution : The correct answer is 1.5 µg/m3.
The ambient air quality standard for lead in an industrial area is specified as 1.5 µg/m³ for a 24-hour average, which means that the concentration of lead in the air should not exceed this limit over 24 hours to comply with the National Ambient Air Quality Standards (NAAQS).
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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
Question : How much air can be held in a closed cubical box, each of whose edges is 12 metres long?
Option 1: 1278 m3
Option 2: 1872 m3
Option 3: 1827 m3
Option 4: 1728 m3
Question : One bar is equal to
Option 1: 103 Pa
Option 2: 100 Pa
Option 3: 105 Pa
Option 4: 104 Pa
Question : If A = 23 × 37, B = 27 × 35 and C = 28 × 34, then what is the least common multiple of A, B and C?
Option 1: 27× 37
Option 2: 26 × 37
Option 3: 28 × 37
Option 4: 29 × 37
Question : The diameter of a sphere is 14.7 metres. What will be the volume of the sphere?
Option 1: 1663.893 m3
Option 2: 1873.487 m3
Option 3: 1693.563 m3
Option 4: 1783.723 m3
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