EASY
7th Tamil Nadu Board
IMPORTANT
Earn 100

_____ is an example of a periodic change.

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Important Questions on Changes Around Us

EASY
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q I
_____ is not a chemical change.
EASY
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q III
Cutting of cloth is an example of a periodic change.
EASY
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q III
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
MEDIUM
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q III
A bean plant collecting sunlight and turning it into bean seeds is an example of physical and non-periodic change.
EASY
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q III
If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.
MEDIUM
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q III
Tarnishing of silver is an example of endothermic change.
HARD
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q IV

Match the following:

A B C
1. Melting Change of state from liquid to solid Ticking of clock
2. Condensation Change of state from liquid to gas Formation of ice cube
3. Evaporation Change of state from solid to liquid Collecting flowers
4. Freezing Change of state from gas to liquid Ice cube to water
5. Periodic change Occurs at irregular time intervals Water to steam
6. Non-periodic change Occurs at regular time intervals Steam to water drops
HARD
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 3 - Changes Around Us>Evaluation>Q V

Classify the following changes as physical and chemical changes:

A rough piece of wood is sanded and polished resulting in change in texture, Rusting of an iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.

Physical changes Chemical changes