Statement I: If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.

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Q.
Given below are two statements:

Statement I: If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.

Statement II: If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water.

In the light of the above statements, choose the most appropriate from the options given below [2024]

1 Both Statement I and Statement II are true

2 Both Statement I and Statement II are false

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans.
(3)

Surface tension decreases with increase in temperature

The height of capillary rise is $h = 2 T$ $\cos$ $θ / ρ g r$

The height of capillary rise will be smaller in hot water and larger in cold water.

Solution

1 Both Statement I and Statement II are true

2 Both Statement I and Statement II are false

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans.
(3)

Surface tension decreases with increase in temperature

The height of capillary rise is $h = 2 T$ $\cos$ $θ / ρ g r$

The height of capillary rise will be smaller in hot water and larger in cold water.

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Solution

1 Both Statement I and Statement II are true

2 Both Statement I and Statement II are false

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans. (3) Surface tension decreases with increase in temperature The height of capillary rise is h=2T cos θ/ρgr The height of capillary rise will be smaller in hot water and larger in cold water.

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Ans.
(3)

Surface tension decreases with increase in temperature

The height of capillary rise is $h = 2 T$ $\cos$ $θ / ρ g r$

The height of capillary rise will be smaller in hot water and larger in cold water.