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Physics · Mechanical Properties of Matter

JEE Main 2024 — 5 April, Shift 1 — Question 33

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

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∘0^{\circ}.

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 above statement, choose the correct answer from the options given below.

  1. Option A:

    Statement-I is false but Statement-II is true.

    Correct
  2. Option B:

    Both Statement-I and Statement-II are true.

  3. Option C:

    Both Statement-I and Statement-II are false

  4. Option D:

    Statement-I is true and Statement-II is false.

Answer: A

Step-by-step solution

Statement I is false because for contact angle θ=0∘\theta = 0^\circ,

h=2Tcos⁡θρgr>0,h=\frac{2T\cos\theta}{\rho g r}>0,

so the liquid rises in the capillary and does not remain at the same level.

Statement II is true since the contact angle depends on the nature of both the solid and the liquid.

Answer key and solution verified before publishing.

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Exam
JEE Main 2024
Paper
5 April, Shift 1
Subject
Physics
Chapter
Mechanical Properties of Matter
Topic
Contact Angle and Capillarity

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