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JEE Main 20139 AprilOnline
Exam
JEE Main
Year
2013
Date
9 April
Mode
Online
Subject
Physics
Chapter
Mechanical Properties of Fluids

JEE Main 2013 · 9 April · Online · Physics · Mechanical Properties of Fluids

This question has Statement-1 and Statement- 2 . Of the four...

This question has Statement-1 and Statement- 2 . Of the four choices given after the Statements, choose the one that best describes the two Statetnents. Statement-1: A capillary is dipped in a liquid and liquid rises to a height hh in it. As the temperature of the liquid is raised, the height hh increases (if the density of the liquid and the angle of contact remain the same). Statement-2: Surface tension of a liquid decreases with the rise in its temperature.

Options

  1. AStatement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation for Statement-1.
  2. BStatement-1 is false, Statement- 2 is true.
  3. CStatement-1 is true, Statement- 2 is false.
  4. DStatement-1 is true, Statement-2 is true; Statement-2 is the correct explanation for Statement-1.

Correct answer

B. Statement-1 is false, Statement- 2 is true.

Step-by-step solution

Surface tension of a liquid decreases with the rise in temperture. At the boiling point of liquid, surface tension is zero. Capillary rise h=2 Tcos⁡θrdgh=\frac{2 \mathrm{~T} \cos \theta}{\mathrm{rdg}} As surface tension T\mathrm{T} decreases with rise in temperature hence capillary rise also decreases.
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