A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :

1. 2.5 g

2. 5.0 g

3. 10.0 g

4. 20.0 g

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 3. 10.0 g

Capillary rise: \(h=\dfrac{2T\cos\theta}{r\rho g}\), so \(h\propto\dfrac1r\).

Mass of water in the tube \(m=\rho\pi r^2h\propto r^2\cdot\dfrac1r=r\).

Radius doubled gives mass doubled: \(2\times5=10\) g. Answer: option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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