Question

short answers question chapter 1 science class 9​

Answer 1

Answer:

short answers question chapter 1 science class 9

Explanation:

Why do we see water droplets on the outer surface of a glass containing ice cold water? Answer: The water vapour present in the air comes in contact with cold surface of the glass, loses its energy and gets converted into droplets of water.

Answer 2

Explanation:

Question 1. Which of the following are matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.

Answer: Chair, air, almonds, and cold-drink.

Question 2. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

Answer: The smell of hot sizzling food reaches severed meters away, as the particles of hot food have more kinetic energy and hence the rate of diffusion is more than the particles of cold food.

Question 3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Answer: A diver is able to cut through water in a swimming pool. This shows that the particles of water have intermolecular space and has less force of attraction

Question 4. What are the characteristics of the particles of matter?

Answer. The characteristics of the particles of matter are:

(1) Particles have intermolecular space.

(2) Particles have intermolecular force.

(3) Particles of matter are moving continuously.