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NCERT Solutions For Class 9 Science Chapter 1 Matter in Our Surroundings are prepared by CBSE student eCARE expert to score good marks in class 9. This chapter contain many topics which are very important to score good in class 9. There are some important topic/Activity mentioned below-
Topics and Sub Topics in Class 9 Science Chapter 1 Matter in Our Surroundings:
1. Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume.
Solution:
The following substances are matter:
Chair
Air
Almonds
Lemon water
Smell of perfume (Smell is considered as a matter due to the presence of some volatile substances in air that occupy space & have mass.)
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:
Particles in the air, if fueled with higher temperatures, acquire high kinetic energy which aids them
to move fast over a stretch. Hence the smell of hot sizzling food reaches a person even at a distance
of several meters.
3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Solution:
The diver is able to easily cut through the water in the swimming pool because of the weak forces of
attraction between water molecules. It is this property of water that attributes to easy diving.
4. What are the characteristics of the particles of matter?
Solution:
The characteristics of particles of matter are:
(a) Presence of intermolecular spaces between particles
(b) Particles are in constant motion
(c) They attract each other