The surface tension of a liquid<br/>

Name: The surface tension of a liquid
Uploaded: 2021-01-01T18:41:02.000Z
Duration: 2 min
Description: The surface tension of a liquid

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Class 11 Physics Mechanics Mechanical Properties of Fluids

The surface tension of a liquid

(a)

increases with area

(b)

decreases with area

(c)

increase with temperature

(d)

decrease with temperature

Correct answer: (d)

Solution:

The surface tension of a liquid decreases with temperature.

T = T_{0} (1 - α t)

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The pressure of air inside a soap bubble of diameter

0.7 c m

8 m m

of water above atmospheric pressure, the surface tension of soap solution is :

Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :

Assertion :Surface tension of oil drop is same whether placed on glass or water surface.
Reason :Surface energy is dependent only on the properties of oil.

The pressure inside a small air bubble of radius

0.1 m m

situated just below the surface of water will be equal to
[Take surface tension of water

70 * 1 0^{- 3} N m^{- 1}

and atmospheric pressure

1.013 * 1 0^{5} N m^{- 2}

]

The osmotic pressure at

1 7^{\circ} C

of an aqueous solution containing

1.75 g

of sucrose per

150 m l

solution is:-

Two soap bubbles of radius

r_{1} = r

and

r_{2} = 2 r

coalesce to form a double as shown, then angle

p j i

, is equal to

A water drop is divided into 8 equal droples. The pressure difference between innere outer sides of the log drop:

Assertion :A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube.
Reason :The excess pressure inside bubble (or drop) is inversely proportional to the radius.