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9.2 , surface tension — Physics STD 11 Science — Question

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

Statement-I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be $0^{\circ}$.

Statement-II: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well :

In the light of above statement, choose the correct answer from the options given below.

  • ✓
    Statement-$I$ is false but Statement-$II$ is true.
  • B
    Both Statement-$I$ and Statement-$II$ are true.
  • C
    Both Statement-$I$ and Statement-$II$ are false.
  • D
    Statement-$I$ is true and Statement-$II$ is false.
✓

Answer

Correct option: A.
Statement-$I$ is false but Statement-$II$ is true.
a
Capillary rise

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

If $\theta=0^{\circ}$ then rise is non-zero

$\therefore$ Statement- $1$ is incorrect.

Option$(1)$ is correct

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