Statement I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0°.

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Q.
Given below are two statements:

Statement I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0°.

Statement II: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.

In the light of the above statement, choose the correct answer from the options given below. [2024]

1 Both Statement I and Statement II are true

2 Statement I is true and Statement II is false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are false

Ans.
(3)

Statement I is false because capillary rise is zero for angle of contact 90°

Capillary rise, $h = \frac{2 T \cos θ}{ρ g r},$ If $θ = 0^{o}$ then rise is non-zero

Statement II is true because angle of contact depends on both liquid and solid.

Solution

1 Both Statement I and Statement II are true

2 Statement I is true and Statement II is false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are false

Ans.
(3)

Statement I is false because capillary rise is zero for angle of contact 90°

Capillary rise, $h = \frac{2 T \cos θ}{ρ g r},$ If $θ = 0^{o}$ then rise is non-zero

Statement II is true because angle of contact depends on both liquid and solid.

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Solution

1 Both Statement I and Statement II are true

2 Statement I is true and Statement II is false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are false

Ans. (3) Statement I is false because capillary rise is zero for angle of contact 90° Capillary rise, h=2Tcosθρgr, If θ=0o then rise is non-zero Statement II is true because angle of contact depends on both liquid and solid.

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Ans.
(3)

Statement I is false because capillary rise is zero for angle of contact 90°

Capillary rise, $h = \frac{2 T \cos θ}{ρ g r},$ If $θ = 0^{o}$ then rise is non-zero

Statement II is true because angle of contact depends on both liquid and solid.