A U-tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water. Is poured into one side until it stands at a distance of `10 mm` above the water level on the other side. Meanwhile the water rises by `65mm` from its original level (see diagram). The density of the oil is:

Options

A. 650 kg `m^(-3)`
B. 425 kg `m^(-3)`
C. 800 kg `m^(-3)`
D. 928 kg `m^(-3) `

Answer

D

Explanation

`h_(oil) rho_(oil)g=h_("water") rho_("water") g`
`140xx rho_(oil)=130xx rho_("water")`
`rho_(oil)=(13)/(14)xx1000 kg// m^(3)`
`rho_(oil)=928 kg" "m^(-3)`