Give reasons

(d) We can easily move our hands in the air but to do the same through a solid block of wood we need a karate expert.

 

Answer

(d) The particles of air (gas) have very less force of attraction between them, thus causing large intermolecular spaces whereas the particles of solids are very tightly packed due to very high force of attraction between its particles.

Due to the difference in the amount of space between the particles, we can easily move our hand in air but to do the same through a solid block of wood we need a karate expert (who uses technique and large force).

Moving hand.png

  1. Class 9
  2. Chapter 1 Class 9 - Matter In Our Surroundings

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.