JEE Main 2020 (Online) 3rd September Morning Slot | Properties of Matter Question 169 | Physics

A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 Nm^–1, density = 667 kg m^–3) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60^o with one another. Then h is close to (g = 10 ms^–2)

0.049 m

0.087 m

0.137 m

0.172 m

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

-1

A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as shown in the figure. The radius of vessel is 5 cm and the angular speed of rotation is $$\omega $$ rad s^–1. The difference in the height, h (in cm) of liquid at the centre of vessel and at the side will be : JEE Main 2020 (Online) 2nd September Morning Slot Physics - Properties of Matter Question 173 English

JEE Main 2020 (Online) 2nd September Morning Slot Physics - Properties of Matter Question 173 English

$${{2{\omega ^2}} \over {25g}}$$

$${{5{\omega ^2}} \over {2g}}$$

$${{25{\omega ^2}} \over {2g}}$$

$${{2{\omega ^2}} \over {5g}}$$

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

A small spherical droplet of density d is floating exactly half immersed in a liquid of density $$\rho $$ and surface tension T. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet) :

$$r = \sqrt {{T \over {\left( {d - \rho } \right)g}}} $$

$$r = \sqrt {{{2T} \over {3\left( {d + \rho } \right)g}}} $$

$$r = \sqrt {{T \over {\left( {d + \rho } \right)g}}} $$

$$r = \sqrt {{{3T} \over {\left( {2d - \rho } \right)g}}} $$

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