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Important Questions Chapter 4 Class 7 Science Curiosity NCERT

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The World of Metals and Non-metals


Short Questions

1. What is the property of metals that allows them to be beaten into thin sheets?

Answer: Malleability

2.Which metal is used in thermometers because it is liquid at room temperature?

Answer: Mercury

3.What is the ringing sound produced by metals called?

Answer: Sonority

4.Which non-metal is essential for breathing?

Answer: Oxygen

5.What is the process called when iron develops brown deposits in moist air?

Answer: Rusting

6.Which property allows metals to be drawn into wires?

Answer: Ductility

7.Are non-metals good or poor conductors of electricity?

Answer: Poor conductors

8.What is the nature of metal oxides?

Answer: Basic

9.Which non-metal is used in water purification?

Answer: Chlorine

10. What is the gradual deterioration of metal surfaces called?

Answer: Corrosion


Long Questions

1. Why are metals like copper and aluminium used for making cooking vessels?

Answer: Metals like copper and aluminium are good conductors of heat, so they heat up quickly. Their handles are made of wood or plastic to prevent burning hands.

2.How does rusting happen on iron objects, and what conditions are needed?

Answer: Rusting happens when iron reacts with both air and water, forming brown deposits. Moist air is essential for rusting to occur.

3.Why are non-metals like sulfur and coal not used to make wires?

Answer: Non-metals like sulfur and coal are not ductile, so they cannot be drawn into wires. They are also poor conductors of electricity.

4.What is the difference between the oxides of metals and non-metals?

Answer: Metal oxides are basic and turn red litmus blue. Non-metal oxides are acidic and turn blue litmus red.

5. How do the properties of metals make them suitable for making jewellery?

Answer: Metals like gold and silver are malleable and ductile, allowing them to be shaped easily. Their lustrous appearance makes them attractive for jewellery.

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