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What will be the maximum capillary rise at 4°C, if the diameter of the capillary tube is 1 cm?

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in Geotechnical Engineering I by (102k points)
What will be the maximum capillary rise at 4°C, if the diameter of the capillary tube is 1 cm?

(a) 0.1234 cm

(b) 0.2975 cm

(c) 0.3857 cm

(d) 0.3084 cm

This question was posed to me in an interview for internship.

Origin of the question is Capillary Siphoning in division Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

1 Answer

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Best answer
The correct choice is (d) 0.3084 cm

The best explanation: Given,

Diameter d=1cm

(hc)max=4Ts/(γwd)

At 4°C,

Ts=75.6 dynes/cm and  γw=9.807kN/m^3

∴ (hc)max=4*75.6 *10^-8/(9.807*10^-6* d)

∴ (hc)max=0.3084/d

At d=1cm,

(hc)max=0.3084/1

∴ (hc)max=0.3084 cm.

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