Changes Around Us: Physical and Chemical — Practice Quiz
CBSE · Class 7 · Science
Try a 4-question quiz on Changes Around Us: Physical and Chemical for CBSE Class 7 Science: tap an answer to check it and see why.
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Quick Quiz: Changes Around Us: Physical and Chemical
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What type of change occurs when ice melts to form water?
When lime water turns milky, it indicates the presence of which gas?
What happens when vinegar is mixed with baking soda?
The minimum temperature at which a substance catches fire is called:
Sample Questions
Which of the following are examples of chemical changes?
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Rusting of iron, Burning of paper, Curdling of milk
Rusting forms iron oxide, burning creates ash and gases, and curdling produces new substances. Folding cloth and boiling water are physical changes as no new substances form.
For combustion to occur, which three things are essential?
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Combustible substance (fuel), Oxygen, Heat to reach ignition temperature
The fire triangle shows that combustion requires fuel, oxygen, and heat. Remove any one of these and the fire will extinguish. CO2 and water are not required for combustion.
True or False: All physical changes are reversible.
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False
Not all physical changes are reversible. For example, cutting paper or breaking glass are physical changes that cannot be easily reversed to get the original form back.
Which of the following changes can be reversed?
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Melting of ice, Folding paper, Inflating a balloon
Ice can be refrozen, paper can be unfolded, and balloon can be deflated. Burning wood and cooking food create new substances and cannot be reversed.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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