1.

When 8 droplets of water of radius 0.5 mm combine to form a single droplet. The radius of it is ..........

Answer»

4 mm
2 mm
1 mm
8 mm

Solution :Volume of 8 droplets of WATER = `8xx 4/3 pi (0.5)^(3)`
When each DROPLET combine to form one volume remains conserved
`R^(3) = 8 xx (0.5)^(3)`
`R^(3) = (8 xx (0.5)^(3))`
`R = 2 xx 0.5` = 1 mm


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