The World of Metals and Non metals Class 7 Short Question Answer

The World of Metals and Non metals Class 7 Short Question Answer

The World of Metals and Non metals Class 7 Short Question Answer

Question 1.

Explain the difference between metals and non-metals in terms of conductivity.

Answer:

Metals are good conductors of heat and electricity, while non-metals are generally poor conductors.

Question 2.

Describe the process of rusting and its environmental conditions.

Answer:

Rusting is the corrosion of iron that occurs when it comes into contact with moisture and oxygen, leading to the formation of iron oxide.

Question 3.

What are alloys, and why are they important?

Answer:

Alloys are mixtures of two or more metals or a metal and a non-metal, and they are important because they often have enhanced properties compared to pure metals, such as increased strength and resistance to corrosion.

Question 4.

Describe the physical properties of metals.

Answer:

Metals are shiny, sonorous, malleable, ductile, and good conductors of heat and electricity. These traits make them suitable for industrial and household applications like wires, cookware, and tools.

Question 5.

Why do non-metals differ from metals in their physical properties?

Answer:

Non-metals are usually dull, brittle, and poor conductors because they lack free moving electrons. This makes them unsuitable for tasks involving heat transfer or structural strength.

Question 6.

What causes rusting in iron objects?

Answer:

Rusting occurs when iron reacts with oxygen and water, forming iron oxide. This weakens the metal over time and affects its appearance and strength.