MEDIUM
7th CBSE
IMPORTANT
Earn 100

How painting on an iron gate prevents it from rusting ? 

Important Questions on Changes Around Us

EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q VI
Is evaporation of water is a physical change?
MEDIUM
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>EXERCISES>Q VI
Explain why should we not play with fireworks.
EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>Brain Teasers
Tearing of a paper is a physical change but burning of paper does not. Why?
EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>Brain Teasers
When we cut an apple into pieces, the surface of the pieces turns brown. Why?
MEDIUM
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>Brain Teasers
Desert area usually do not face problem of rusting. Why?
EASY
7th CBSE
IMPORTANT
SCIENCE ROUTE 7>Chapter 9 - Changes Around Us>Brain Teasers
Meeta saw that the volume of perfume in her bottle had become less after a few days. Probably the perfume had evaporated. Is the evaporation of perfume a physical change or a chemical change?