WBCS.LIVE practice question

A shaving brush is dipped in water. When taken out the hairs of the brush are seen to be drawn together due to

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. surface tension of water.
  2. viscosity of water.
  3. elasticity of the hairs of the brush.
  4. temperature difference between air and water.

Correct answer and explanation

Correct answer: surface tension of water.

Explanation: āœ… Correct Answer: A) surface tension of water. šŸ“š Explanation: Surface tension is the property of a liquid's surface that acts like a thin elastic sheet, trying to minimize its surface area. When a brush is taken out of water, the thin film of water on the hairs pulls them together to reduce the surface area. This is why the brush hairs appear stuck together when wet.