Nature of Matter: Elements, Compounds, and Mixtures — Practice Quiz
CBSE · Class 8 · Science
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Quick Quiz: Nature of Matter: Elements, Compounds, and Mixtures
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Which of the following is the best definition of a mixture?
When water is heated and converted to steam, and then cooled back to water, what type of change occurs?
Sugar is heated and it turns brown, then black, leaving behind carbon and water. This shows that sugar is a:
A sprout salad with green gram, chickpeas, onion, and tomato is an example of:
Sample Questions
Air is composed of several gases. Which of the following are major components of air?
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Nitrogen, oxygen, argon, carbon dioxide, and water vapour
Air is a uniform mixture made mainly of nitrogen, oxygen, argon, carbon dioxide, and water vapour. Nitrogen is the largest component, about 78% of air, and it does not take part in combustion. Dust particles may be present in air, but they are not treated as major components of air.
Which of the following correctly describes elements?
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Cannot be broken down into simpler substances, Are building blocks of all matter, Made up of identical atoms
Elements are the simplest substances that cannot be broken down further, serve as building blocks of matter, and consist of identical atoms. However, some elements like hydrogen and oxygen exist as molecules, not single atoms.
When calcium hydroxide (lime water) is exposed to air, it turns milky. This indicates the presence of:
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Carbon dioxide
Lime water turns milky when it reacts with carbon dioxide to form calcium carbonate (white precipitate). This is a standard test for detecting carbon dioxide in air.
Which of the following are examples of alloys?
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Stainless steel, Brass, Bronze
Alloys are uniform mixtures of metals. Stainless steel (iron + nickel + chromium), brass (copper + zinc), and bronze (copper + tin) are all alloys. Pure gold and pure iron are elements, not alloys.
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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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