Question

Assertion : When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow
Reason: Product of radius of meniscus and height of liquid in the capillary tube always remain constant

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

Both assertion and reason are true and reason is the correct explanation of assertion
From equation $hR=\frac{2S}{\rho g}=$ a finite constant
Hence when the tube is of insufficient length, radius of curvature of the liquid meniscus increases, so as to maintain the product $hR$ a finite constant, i.e., as $h$ decreases, $R$ increases and the liquid meniscus becomes more and more flat, but the liquid does not overflow