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

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

Concept Questions :-

Capillary rise
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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) $\frac{\mathrm{hr\rho g}}{2}$

Concept Questions :-

Capillary rise
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Kerosene oil rises up the wick in a lantern

(a) Due to surface tension of the oil

(b) The wick attracts the kerosene oil

(c) Of the diffusion of the oil through the wick

(d) None of the above

Concept Questions :-

Properties of fluids

Difficulty Level:

Water rises against gravity in a capillary tube when its one end is dipped into water because

(a) Pressure below the meniscus is less than atmospheric pressure

(b) Pressure below the meniscus is more than atmospheric pressure

(c) Capillary attracts water

(d) Of viscosity

Concept Questions :-

Properties of fluids

Difficulty Level:

A capillary tube of radius R is immersed in water and water rises in it to a height H. Mass of water in the capillary tube is M. If the radius of the tube is doubled, mass of water that will rise in the capillary tube will now be

(a) M                                    (b) 2M
(c) M/2                                 (d) 4M

Concept Questions :-

Properties of fluids
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

There is a horizontal film of soap solution. On it, a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the loop be T, then what will be the tension in the thread ?

(a) ${\mathrm{\pi R}}^{2}/\mathrm{T}$                      (b) ${\mathrm{\pi R}}^{2}\mathrm{T}$

(c) $2\mathrm{\pi RT}$                        (d) $2\mathrm{RT}$

Concept Questions :-

Properties of fluids