Physical And Chemical Changes CLASS 7 (BASED ON 'NCERT BOOK'

Which of the following is a Reversible Physical Change?

• A. Burning of candle Wick

• B. Cutting of Paper

• C. Bursting of a balloon

• D. Melting of wax in a candle

Properties of Physical changes are _________ , ________ , __________ and _______________.

A change in which one or more new substance is formed is called a-

• A. PHYSICAL CHANGE

• B. CHEMICAL CHANGE

• C. REVERSIBLE CHANGE

• D. IRREVERSIBLE CHANGE

For rusting, the presence of both ____________ and ____________ is essential.

• Oxygen

• Carbon Dioxide

• Water (water vapour)

• Heat (warmth)

Are Physical Changes always reversible?

• True

• False

If you leave a piece of Iron in the open for some time it acquiresa film of ____________ substance.

• Brownish

• Yellow

• Reddish

• Blackish

Which 2 of the following are Chemical Changes?

• A. Rusting Iron

• B. Cutting of Trees

• C. Melting of Wax

• D. Digestion of food in our body.

Which type of Change is this " Fermentation of grapes"?

If you heat up and melt an Iron Rod. Can you Reverse the change?

• Yes

• No, we can't

• Maybe, but not sure

• Impossible

When carbon dioxide is passed through lime water, it turns milky due to the formation of ______________.