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9.2 , surface tension — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
A false statement is
  • A
    Angle of contact $\theta < 90^\circ $, if cohesive force < adhesive force
  • B
    Angle of contact$\theta > 90^\circ ,$, if cohesive force > adhesive force
  • C
    Angle of contact $\theta $$= 90°$, if cohesive force = adhesive force
  • ✓
    If the radius of capillary is reduced to half, the rise of liquid column becomes four times
✓

Answer

Correct option: D.
If the radius of capillary is reduced to half, the rise of liquid column becomes four times
d
(d) If radius of capillary is reduced to half, the rise of liquid column will be two times. ${\rm{as }}h \propto 1/r$

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