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Properties of Matter question

2017 · Q155
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Properties of Matter question

2017 · Q155

NEETPhysicsProperties of MatterMCQ+4 / −1
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 65 mm from its original level (see diagram). The density of the oil is

NEET 2017 Physics - Properties of Matter Question 78 English
  1. A
    425 kg m−-−3
  2. B
    800 kg m−-−3
  3. C
    928 kg m−-−3
  4. D
    650 kg m−-−3
View written solutionFree

Correct answer: C

Here, hoil×ρoil×g=hwater×ρwater×g{h_{oil}} \times {\rho _{oil}} \times g = {h_{water}} \times {\rho _{water}} \times ghoil​×ρoil​×g=hwater​×ρwater​×g

ρ0g×140×10−3=ρwg×130×10−3{\rho _0}g \times 140 \times {10^{ - 3}} = {\rho _w}g \times 130 \times {10^{ - 3}}ρ0​g×140×10−3=ρw​g×130×10−3

ρoil=130140×103≈928 kg/m3{\rho _{oil}} = {{130} \over {140}} \times {10^3} \approx 928\,kg/{m^3}ρoil​=140130​×103≈928kg/m3
[∵ρw=1 kgm−3]\left[ \because {{\rho _w} = 1\,kg{m^{ - 3}}} \right][∵ρw​=1kgm−3]

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