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The time for a particle to settle, of diameter 0.06 through a height of 10 cm is_________

a) 25.8 s
b) 42 m 59 s
c) 3 m 52 s
d) 42.8 s

Answer: a
Explanation: Based on the time of settlement of particles of various diameters it is found that minimum time of 25.8 s is needed for a particle to settle of diameter 0.006 mm.

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