Edu Bright Pages - Properties of Materials — Class 7 | Quiz

20 optional multiple-choice questions from Chapter Properties of Materials.

1. Which property allows metals to be beaten into thin sheets?

Correct: Malleability — Malleability is the property by which materials can be beaten into thin sheets (e.g., aluminium foil, silver foil).

2. Which of the following describes ductility?

Correct: Ability to be drawn into wires — Ductility refers to drawing metals into thin wires (e.g., copper wires).

3. Which property makes a metal produce a ringing sound when struck?

Correct: Sonority — Sonorous materials (usually metals) produce a ringing sound (e.g., bells, coins).

4. Which material will most likely break into pieces when hammered?

Correct: Coal piece — Coal is brittle and breaks into pieces under hammering; metals like copper or iron become flat.

5. Which of these metals is liquid at room temperature?

Correct: Mercury — Mercury is a metal that is liquid at room temperature and used in some thermometers.

6. Which metals are known to be very soft and can be cut with a knife?

Correct: Sodium and potassium — These alkali metals are soft and can be cut with a knife; they react quickly with air and water.

7. A metal spoon and wooden spoon are kept in hot water. Which will feel hotter at the handle and why?

Correct: Metal spoon — Metals conduct heat well, so the metal spoon becomes hotter than the wooden spoon.

8. Which of these materials is a poor conductor of electricity?

Correct: Rubber — Rubber is an insulator (poor conductor); metals like copper, iron, aluminium are good conductors of electricity.

9. What is the brown deposit formed on iron exposed to moist air called?

Correct: Rust — The brown deposit on iron is called rust; rusting requires both air and water (moisture).

10. Which of the following prevents iron from rusting by forming a protective layer of zinc?

Correct: Galvanisation — Coating iron with zinc (galvanisation) protects iron by acting as a sacrificial/protective layer.

11. Which of the following is NOT typically a property of metals?

Correct: Brittleness — Metals are usually not brittle; brittleness is typical of non-metals like coal or sulfur.

12. Why are the handles of many cooking utensils made of wood or plastic?

Correct: Because wood/plastic are poor conductors — Using poor conductors for handles prevents burns when metal parts get hot.

13. Which ancient iron structure in India is famous for resisting rust?

Correct: Iron Pillar of Delhi — The Iron Pillar (over 1600 years old) shows remarkable resistance to rust, highlighting ancient metallurgy skills.

14. Which of these materials would make the bulb glow in a simple tester circuit?

Correct: Copper wire — Copper is a good conductor and will complete the circuit to light the bulb; coal, wood and rubber do not conduct well.

15. Which of the following is an alloy made from iron and carbon often used for strong ropes and bridges?

Correct: Steel — Steel is an alloy of iron and carbon, used for strong cables and structural components.

16. Which practice helps reduce rust on iron tools stored outside?

Correct: Painting or oiling — Painting or oiling forms a protective layer that prevents moisture and air reaching iron and reduces rusting.

17. Which example shows metallic lustre?

Correct: A copper coin — Metals like copper show metallic lustre (shiny surface), unlike coal or wood.

18. Why are metal vessels commonly used for cooking?

Correct: Metals are good conductors of heat — This allows even heating and efficient cooking; handles are often made of poor conductors to prevent burns.

19. Which of the following materials would you expect to be non-lustrous and not ductile?

Correct: Sulfur — Sulfur is a non-metal: non-lustrous, brittle, and not ductile.

20. Which statement about corrosion is true?

Correct: Corrosion is gradual deterioration — Corrosion affects many metals (not just iron) and results from reactions with air, water or other chemicals; it weakens metals.

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