MEDIUM
7th CBSE
IMPORTANT
Earn 100

Give two methods of preventing the rusting of iron.

Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q B
What are the essential conditions for rusting of iron objects?
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q B
Name the constituent metals of stainless steel.
 
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q A
During which of the following changes are new substances formed?
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q A
Dissolving sugar in water is a/an _____.
MEDIUM
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q A
Carbon dioxide turns lime water _____.
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q A
In galvanisation, iron objects are coated with _____.
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q B

Circle the odd one. Give reasons for your choice:

Stretching of a rubber band,      photosynthesis in plants,      formation of clouds,      melting of wax.

EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 6 - Physical and Chemical Changes>Exercise>Q B

Circle the odd ones. Give reasons for your choice:

Formation of curd from milk,       digestion of food,       spoilage of food,       grinding of a substance.