NEET2018PhysicsMechanical Properties of FluidsActual
Find density of ethyl alcohol
Options
- A0.83 gm cm ^3
- B0.5 gm cm ^3
- C1.83 gm cm ^3
- D0.12 gm cm ^3
Correct answer
A. 0.83 gm cm ^3
Step-by-step solution
Pressure at left hand of U-tube, p₁=p₀+ ₁ g h₁=p₀+ ₁ g (10 10⁻² ) or p ₁= p ₀+ ₁ Pressure at right hand of u-tube, aligned & p₂=p₀+ ₂ g h₂=p₀+ ₂ g (12 10⁻² ) & or p ₂= p ₀+1.2 ₂ & aligned The mercury column in both arms of U -tube are at same level, therefore pressure in both arms will be same. or p ₁= p ₂ p ₀+ ₁= p ₀+1.2 ₂ Density of ethyl alcohol, ₂= ₁ 1.2 = 1000 1.2 =833.3 ~kg / m ^3=0.83 gm / cm ^3