During capillary rise of a liquid in a capillary tube, the surface of contact that remains constant is of

(a) Glass and liquid                (b) Air and glass
(c) Air and liquid                    (d) All of these

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Capillary rise
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A shell having a hole of radius r is dipped in water. It holds the water upto a depth of h then the value of r is

(a) $\mathrm{r}=\frac{2\mathrm{T}}{\mathrm{hdg}}$                             (b) $\mathrm{r}=\frac{\mathrm{T}}{\mathrm{hdg}}$

(c) $\mathrm{r}=\frac{\mathrm{Tg}}{\mathrm{hd}}$                               (d) None of these

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Capillary rise
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In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

(a) 1.2 mm                       (b) 2.4 mm
(c) 0.6 mm                       (d) 0.4 mm

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Capillary rise
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If capillary experiment is performed in vacuum, then for a liquid there capillary rise

(a) It will rise              (b) Will remain same
(c) It will fall               (d) Rise to the top

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Capillary rise
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If liquid level falls in a capillary then radius of capillary will

(a) Increase                     (b) Decrease
(c) Unchanged                 (d) None of these

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Capillary rise
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Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be
(a) 6h                           (b)$\frac{1}{6}\mathrm{h}$
(c) h                             (d) Zero

Concept Questions :-

Capillary rise
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Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively Ratio of heights of liquids in the two tubes $\frac{{\mathrm{h}}_{1}}{{\mathrm{h}}_{2}}$ is

(a) $\frac{10}{9}$                     (b) $\frac{3}{10}$

(c) $\frac{10}{3}$                     (d) $\frac{9}{10}$

Concept Questions :-

Capillary rise
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Water rises in a vertical capillary tube upto a height of 2.0 cm . If the tube is inclined at an angle of $60°$ with the vertical, then upto what length the water will rise in the tube ?

(a) 2.0 cm                              (b) 4.0 cm
(c) $\frac{4}{\sqrt{3}}\mathrm{cm}$                             (d) $2\sqrt{2}\mathrm{cm}$

Concept Questions :-

Capillary rise
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The surface tension for pure water in a capillary tube experiment is

(a) $\frac{\mathrm{\rho g}}{2\mathrm{hr}}$                    (b) $\frac{2}{\mathrm{\rho ghr}}$

(c) $\frac{\mathrm{r\rho g}}{2\mathrm{h}}$                     (d) $\frac{\mathrm{hr\rho g}}{2}$

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Capillary rise
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In a capillary tube experiment, a vertical 30 cm long capillary tube is dipped in water. The water rises up to a height of 10cm due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes-
(a) 10 cm                             (b) 20 cm
(c) 30 cm                             (d) Zero

Concept Questions :-

Properties of fluids