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A capillary tube is dipped in water. What is the shape of the water surface insi

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Question: A capillary tube is dipped in water. What is the shape of the water surface inside the tube?

Options:

  1. Flat
  2. Concave
  3. Convex
  4. Irregular

Correct Answer: Concave

Solution: 

The water surface inside the capillary tube is concave due to the adhesive forces between water and the tube material being stronger than the cohesive forces among water molecules.

A capillary tube is dipped in water. What is the shape of the water surface insi

Practice Questions

Q1
A capillary tube is dipped in water. What is the shape of the water surface inside the tube?
  1. Flat
  2. Concave
  3. Convex
  4. Irregular

Questions & Step-by-Step Solutions

A capillary tube is dipped in water. What is the shape of the water surface inside the tube?
Correct Answer: Concave
  • Step 1: Understand what a capillary tube is. It is a very thin tube that can draw liquids up into it.
  • Step 2: Know that when the tube is dipped in water, the water tries to move up into the tube.
  • Step 3: Learn about adhesive forces. These are the forces that attract water molecules to the material of the tube.
  • Step 4: Learn about cohesive forces. These are the forces that attract water molecules to each other.
  • Step 5: Compare the adhesive forces and cohesive forces. In this case, the adhesive forces between the water and the tube are stronger than the cohesive forces among the water molecules.
  • Step 6: Because the adhesive forces are stronger, the water will climb up the sides of the tube and create a curve.
  • Step 7: This curve in the water surface is called a concave shape, meaning it dips down in the middle.
  • Capillarity – The phenomenon where liquid rises or falls in a narrow space due to adhesive and cohesive forces.
  • Adhesive Forces – The attractive forces between the liquid molecules and the surface of the tube.
  • Cohesive Forces – The attractive forces between the molecules of the liquid itself.
  • Meniscus – The curve in the surface of a liquid in a container, which can be concave or convex depending on the balance of adhesive and cohesive forces.
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