Statement I: Pressure of a fluid is exerted only on a solid surface in contact as the fluid-pressure does not exist everywhere in a still fluid. [2026]

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Q.
Given below are two statements:

Statement I: Pressure of a fluid is exerted only on a solid surface in contact as the fluid-pressure does not exist everywhere in a still fluid.

Statement II: Excess potential energy of the molecules on the surface of a liquid, when compared to interior, results in surface tension.

In the light of the above statements, choose the correct answer from the options given below. [2026]

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

Ans.
(4)

According to Pascal’s law, pressure at any point in a liquid at rest is the same in all directions.

It exists at every point in the liquid, not just at the boundaries. So statement (1) is false.

For an interior molecule, the net cohesive forces are zero. Hence statement (2) is correct.

Solution

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

Ans.
(4)

According to Pascal’s law, pressure at any point in a liquid at rest is the same in all directions.

It exists at every point in the liquid, not just at the boundaries. So statement (1) is false.

For an interior molecule, the net cohesive forces are zero. Hence statement (2) is correct.

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Solution

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

Ans. (4) According to Pascal’s law, pressure at any point in a liquid at rest is the same in all directions. It exists at every point in the liquid, not just at the boundaries. So statement (1) is false. For an interior molecule, the net cohesive forces are zero. Hence statement (2) is correct.

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