HARD
9th CBSE
IMPORTANT
Earn 100

Why is steam at 100°C a more effective heating agent than water at 100°C?

Important Questions on Matter in Our Surroundings

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 20

Define evaporation. Give an example that indicates that evaporation is an endothermic process.

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 21

What are the factors which affect the rate of evaporation?

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 22
Why does ethanol evaporate faster than water?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 23

Why does water evaporate faster in a Petri dish than in a test tube?

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 24
Why does it take longer time for the evaporation process on a rainy day?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 25
Give an example which indicates that evaporation is a cooling process.
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 26

Why does the temperature remain constant during the change of state?

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 27

Why do we feel cool under a fan when we perspire?