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9th CBSE
IMPORTANT
Earn 100

Why does a desert cooler cool better on a hot dry day?

Important Questions on Matter in Our Surroundings

MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 1
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold drinks, lemon water, smell of perfume.
HARD
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 2
Give reason 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.
HARD
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 3
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
HARD
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 2
How does the water kept in an earthen pot (matka) become cool during summers?
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 3
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Questions>Q 4
Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Exercises>Q 2
Convert the following temperatures to Kelvin scale.
(a) 25°C
(b) 373°C
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 1 - Matter in Our Surroundings>Exercises>Q 3

Give reason for the following observation.

Naphthalene balls disappear with time without leaving any solid.