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9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
Given below are two statements:

$Statement$ $I$ : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.

$Statement$ $II$ : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water.

In the light of the above statements, choose the most appropriate from the options given below

  • A
     Both Statement $I$ and Statement $II$ are true
  • B
     Both Statement $I$ and Statement $II$ are false
  • ✓
     Statement$I$ is true but Statement $II$ is false
  • D
     Statement $I$ is false but Statement $II$ is true
✓

Answer

Correct option: C.
 Statement$I$ is true but Statement $II$ is false
c
Surface tension will be less as temperature increases

$\mathrm{h}=\frac{2 \mathrm{~T} \cos \theta}{\rho \mathrm{gr}}$

Height of capillary rise will be smaller in hot water and larger in cold water.

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