SSC JE Civil Engineering 23-Sep-2019 Shift 2 Solved Paper

Question : 153 of 200

Marks: +1, -0

Which type of particle has the least self-cleaning velocity?

S.N.	Nature of Material	Self cleansingvelocity (cm/sec)
1.	Angular stones	100
2.	Round pebbles (12 mm to 25 mm dia)	50 – 60
3.	Fine gravel	30
4.	Coarse sand	20
5.	Fine sand and clay	15
6.	Fine clay and slit	7.5

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