Metals and non‑metals Quiz - ICSE Class 7 Science
Free practice quiz: Metals and non‑metals (ICSE Class 7 Science). 52 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following non-metals is essential for respiration in most living organisms?
- Nitrogen
- Oxygen
- Carbon
- Sulfur
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Answer: B. Oxygen
Oxygen is a vital non-metal that is used by most living organisms, including humans, for cellular respiration to produce energy.
Which non-metal is a solid at room temperature and is known for its allotropes, such as diamond and graphite?
- Sulfur
- Phosphorus
- Carbon
- Silicon
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Answer: C. Carbon
Carbon (C) is a solid non-metal at room temperature. It exhibits allotropy, meaning it can exist in different forms in the same physical state. Diamond and graphite are famous allotropes of carbon.
Which non-metal is essential for the formation of bones and teeth in humans and animals?
- Sulfur
- Phosphorus
- Calcium
- Magnesium
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Answer: B. Phosphorus
Phosphorus is a non-metal that, along with calcium, is a major component of bones and teeth, contributing to their strength and structure.
Which property of metals is essential for their use in making electrical wires?
- Malleability
- Sonorousness
- Conductivity
- Brittleness
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Answer: C. Conductivity
Electrical conductivity is the ability of a material to allow electric current to flow through it. Metals like copper and aluminum are excellent conductors of electricity.
Which metal is very resistant to corrosion and is often used to coat other metals to protect them from rusting, such as in galvanized iron?
- Copper
- Iron
- Zinc
- Aluminum
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Answer: C. Zinc
Zinc (Zn) is a metal that forms a protective oxide layer on its surface, making it highly resistant to corrosion. This property is utilized in galvanization.