HARD
7th CBSE
IMPORTANT
Earn 100

Match the following.

1. Freezing of water (a) Depletion of the ozone layer
2. Endothermic reaction (b) Physical change
3. Burning of crackers (c) Heat absorbed
4. Chlorofluorocarbon (d) Prevents rusting
5. Galvanisation (e) Chemical change

Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 1
Name the gas that comes out when baking soda is mixed with vinegar. (Oxygen/Carbon dioxide)
MEDIUM
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 2
What kind of change takes place when you are setting curd?
HARD
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 3
Name a process through which you can save iron objects from rusting. (Oxidation / Galvanisation / Electrolysis)
HARD
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 4

Write the name of the gas which can cause holes in the ozone layer? (Oxygen / Nitrogen / CFC)

HARD
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 5
Name the process through which we get pure substances like common salt? (Filtration/ Sublimation/ Crystallisation)
HARD
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 1
What are physical and chemical changes?
MEDIUM
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 2
What is an alloy?
MEDIUM
7th CBSE
IMPORTANT
Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 3
Give two changes produced by chemical reactions.