1. Matter in Our Surroundings – Class 9 Science | NCERT Chapter-wise Important Questions and Answers (CBSE)

Chapter 1: Matter in Our Surroundings – Class 9 Science NCERT | Chapterwise Important Questions and Answers (CBSE)

Chapter 1 : Matter in Our Surroundings

Internal Question :

1. Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume.
Answer: The items that are considered matter are chair, air, almonds, cold, and lemon water. Matter refers to anything that has mass and occupies space. Love, smell, hate, thought, and the smell of perfume are not considered matter as they do not have mass or occupy physical space.

Or The items that are considered matter are chair, air, almonds, cold, lemon water, and the smell of perfume. Love, smell, hate, and thought are not considered matter as they do not have mass or occupy physical space.

2. Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Answer:

The smell from hot sizzling food can travel far because its tiny particles move around quickly due to the heat, reaching us from a distance. Cold food doesn't release as many particles, and they move slower, so we have to get closer to smell it.

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Posted 4 months ago