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The angle of contact for pure water and ...

The angle of contact for pure water and clean glass surface is

A

acute

B

obtuse

C

`90^(@)`

D

`0^(@)`

Text Solution

Verified by Experts

`(d) 0^(@)`
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The value of the angle of contact for pure water and mercury with the surface of glass respectively-

Water rises up in a glass capillary upto a heigh 10 cm, while mercury falls down by 3.5 cm in the same capillary. If the angles of contact for water-glass and mercury-glass are taken as 0^(@) and 135^(@) respectively, compare the surface tensions of water and mercury. [Given density of water = 10^(3) kg m^(-3) , density of mercury = 13.6 xx 10^(3) kg m^(-3) ]

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Water rises up in a glass capillary upto a height of 9.0cm , while mercury falls down by 3.4 cm in the same capillary. Assume angles of contact for water glass and mercury glass 0^(@) and 135^(@) respectively. Determine the ratio of surface tension of mercury and water (cos 135^(@)=-0.71) .

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GURUKUL PUBLICATION - MAHARASHTRA PREVIOUS YEAR PAPERS- OCTOBER 2015-SECTION-1
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