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Byju's Answer

Standard XII

Physics

Lens Maker's Formula

The angle of ...

Question

The angle of contact at the interface of water-glass is $0^{o}$ , Ethylalcohol-glass is $0^{o}$ , mercury-glass is $140^{o}$ and Methyliodide-glass is $30^{o}$ . A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is then

water

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ethylalcohol

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mercury

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methyliodide.

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Solution

The correct option is C mercury
The meniscus of liquid in a capillary tube will be convex upwards if the angle of contact is obtuse. It is so when one end of a glass capillary tube is immersed in a trough of mercury.

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Similar questions

Q. The angle of contact at the interface of water-glass is

0^{\circ}

. Ethyl alcohol-glass is

0^{\circ}

. Mercury-glass is

140^{\circ}

and Methyl iodide-glass is

30^{\circ}

. A glass capillary is put in trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is:

Q. The angle of contact at the interface of water glass is

0^{\circ}

, Ethyl-alcohol glass is

0^{\circ}

Mercury glass is

140^{\circ}

and Methyl iodide is

30^{\circ}

. A glass capillary is put in a trough containing one of these for liquids it is observed that the meniscus is convex. the liquid in the trough is :

Q. Mercury has an angle of contact equal to

140^{o}

with soda lime glass. A narrow tube of radius

1.00 m m

made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside ? Surface tension of mercury at the temperature of the experiment is

0.465 N m^{- 1}

. Density of mercury

= 13.6 \times 10^{3} k g m^{- 3}

Q. Match List I with List - II

List - I	List - II
a) Meniscus of water in a glass Capillary tube	e) convex
b) Meniscus of water in silver capillary tube	f) do not over flow
c) Meniscus of mercury in glass capillary tube	g) flat
d) Water in glass capillary tube of insufficient length	h) concave

The correct match is :

Explain why

(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.

(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)

(d) Water with detergent dissolved in it should have small angles of contact.

(e) A drop of liquid under no external forces is always spherical in shape

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The angle of contact at the interface of water-glass is 0o, Ethylalcohol-glass is 0o, mercury-glass is 140o and Methyliodide-glass is 30o. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is then

The correct option is C mercuryThe meniscus of liquid in a capillary tube will be convex upwards if the angle of contact is obtuse. It is so when one end of a glass capillary tube is immersed in a trough of mercury.

The correct option is C mercury
The meniscus of liquid in a capillary tube will be convex upwards if the angle of contact is obtuse. It is so when one end of a glass capillary tube is immersed in a trough of mercury.