Class 9 science question answer of chapter number 1

Class 9 science question answer of chapter number 1 

Question 1:Which of the following are matters? 
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of  perfume.  Solution: Any things which have some weight and occupy space will  come under category of matter.Chair, air, smell, almonds, cold-drink and smell of perfume: Matter.

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.
Solution: Evaporation is directly proportional to temperature, means hot food evaporates easily.Diffusion of hot food vapor with air becomes very fast and can reach to a distant place within a very short time.

Question 3:A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Solution: The phenomena of cutting the water by the diver show that matter has space between its particles. 


Question 4:What are the characteristics of the particles of matter?
Solution: Characteristics of particles of matter are given below: 
1. Particles of matter have space between them. 
2. Particles of matter are continuously moving. 
3. Particles of matter have an attraction force between them. 
4. Particles of matter are very small in size

Class 9 science question answer of chapter number 1 

Question 1:Which of the following are matters? 
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of  perfume.  Solution: Any things which have some weight and occupy space will  come under category of matter.Chair, air, smell, almonds, cold-drink and smell of perfume: Matter.

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.
Solution: Evaporation is directly proportional to temperature, means hot food evaporates easily.Diffusion of hot food vapor with air becomes very fast and can reach to a distant place within a very short time.

Question 3:A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Solution: The phenomena of cutting the water by the diver show that matter has space between its particles. 


Question 4:What are the characteristics of the particles of matter?
Solution: Characteristics of particles of matter are given below: 
1. Particles of matter have space between them. 
2. Particles of matter are continuously moving. 
3. Particles of matter have an attraction force between them. 
4. Particles of matter are very small in size. . 



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