Question

Previous Yeals Que
1.
In a u-tube as shown in the fig. water and oil are
in the left side and right side of the tube
respectively. The heights from the bottom for water
and oil columns are 15 cm and 20 cm
respectively. The density of the oil is
(take pwater = 1000 kg/m] [NEET-2019 (Odisha)]
20 cm
15 cm
oil
water
(1) 1333 kg/m3
(3) 750 kg/m3
(2) 1200 kg/m3
(4) 1000 kg/m3
be​

Answer 1

Answer: option (3): 750 kg/m³

Explanation:

The height from the bottom of water column, hw = 15 cm = 0.15 m  

The height from the bottom of oil column, ho = 20 cm = 0.2 m  

The density of water, dw = 1000 kg/m³

We know that the pressure of the static fluid depends only upon the depth of the fluid, density of the fluid, and the acceleration of the gravity. So,  

P = h * d * g ….. (i)

Let the density of oil be denoted as “do”.

Now,  

[The pressure  of water on the left side] = [The pressure of oil on the right side]

⇒ hw * dw * g = ho * do * g

based on the formula (i) and substituting the given values, we get  

⇒ 0.15 * 1000 * g = 0.2 * do * g

⇒ do = [0.15 * 1000] / 0.2  

⇒ do = 750 kg/m³

Thus, the density of oil is 750 kg/m³.

Answer 2

Explanation:

hope it is right...........