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Chapter 7: Problem 1022

Read the assertion and reason carefully and mark the correct option given below. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not the correct explanation of the assertion. (c) If assertion is true but reason is false. (d) If the assertion and reason both are false. Assertion: The concept of surface tension is held only for liquids. Reason: Surface tension does not hold for gases. (A) a (B) \(b\) (C) \(\mathrm{c}\) (D) \(\mathrm{d}\)

Short Answer

Expert verified
The correct option is (a) because both the assertion and reason are true, and the reason is the correct explanation of the assertion. Surface tension is held only for liquids due to the attractive forces between liquid molecules, while gases do not have a well-defined surface and no significant cohesive forces between their molecules.

Step by step solution

01

Defining surface tension

Surface tension is a property of liquids that relates to the cohesive forces between liquid molecules at the surface of a liquid. At the surface, the attractive forces of the liquid molecules cause the surface to contract, creating a force that appears as if the surface were covered by a stretched elastic film.
02

Surface tension in liquids

Surface tension is an important property in liquids because it causes liquids to contract to form spherical shapes, which minimizes their surface area. Surface tension plays a crucial role in various everyday phenomena, such as the formation of water droplets and soap bubbles.
03

Surface tension in gases

Gases do not have a well-defined surface, and their molecules are in constant motion with no significant cohesive forces between them. Due to the lack of attractive forces between gas molecules, surface tension is not a relevant concept in gases.
04

Evaluating the assertion and reason

The assertion is correct—the concept of surface tension is held only for liquids. The reason is also correct—surface tension does not hold for gases. The reason provides a correct explanation for the assertion.
05

Choosing the correct option

Since both the assertion and reason are true, and the reason is the correct explanation of the assertion, the correct option is (a).

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Most popular questions from this chapter

Eight drops of a liquid of density 3 and each of radius a are falling through air with a constant velocity \(3.75 \mathrm{~cm} \mathrm{~S}^{1}\) when the eight drops coalesce to form a single drop the terminal velocity of the new drop will be (A) \(15 \times 10^{-2} \mathrm{~ms}^{-1}\) (B) \(2.4 \times 10^{-2} \mathrm{~m} / \mathrm{s}\) (C) \(0.75 \times 10^{-2} \mathrm{~ms}^{-1}\) (D) \(25 \times 10^{-2} \mathrm{~m} / \mathrm{s}\)

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