MEDIUM
9th CBSE
IMPORTANT
Earn 100

Explain the following:
Naphthalene balls disappear with time without leaving any solid.
 

Important Questions on Matter in Our Surroundings

HARD
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 9
Explain the following:
A desert cooler cools better on a hot dry day. 
 
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 10
 What is evaporation? In what way is it different from boiling?
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 10
Define latent heat of vaporisation. 
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 11
Arrange solids, liquids and gases in order of increasing inter-particle forces.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 11
Arrange solids, liquids and gases in order of fluidity.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 11
Arrange solids, liquids and gases in order of compressibility.
 
HARD
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 12
Enumerate the changes that take place inside the matter during the change of states.
HARD
9th CBSE
IMPORTANT
Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 1 - Matter in Our Surroundings>TEST YOURSELF>Q 12
When a solid melts, its temperature remains constant. Why?