1.

A ball is rising through a liquid with constant speed. The ratio of density of liquid to that of material of ball is 3 : 1. The ratio of viscous force to the weight of the ball is:

Answer»

`1:3`
`2:1`
`1:4`
`4:1`

Solution :Here `6pietarv+4/3pir^(3)PG`
`=4/3pir^(3)3.p.g`
or `6pietarv=4/3pir^(3)g(3p-p)`
`F=6pietarv`
`=4/3pir^(3)xx2p.g=8/3pir^(3)pg`
Ratio `F/W=(8/3pir^(3)pg)/(4/3pir^(3)pg)=2/1`
`therefore` CORRECT CHOICE is (B).


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