Properties and Sustainable Use of Materials

Which of the following is a non-metallic material?

• Aluminium

• Copper

• Wood

• Steel

Answer explanation

Wood is a non-metallic material, while aluminium, copper, and steel are all metals. Non-metals are typically characterized by their lack of metallic properties, which wood exemplifies.

How do metallic materials cool when put under a shade?

• Cool slowly

• Remain warm

• Cool faster

• Heat up more

Answer explanation

Metallic materials cool faster in the shade because they are no longer exposed to direct sunlight, which reduces heat absorption. This allows them to lose heat more quickly to the surrounding air.

Which characteristic applies to non-metallic materials?

• Sonorous

• Rough texture when not polished

• High heat absorption

• Rust quickly

Answer explanation

Non-metallic materials often have a rough texture when not polished, distinguishing them from metals, which are typically smooth. The other options, like being sonorous or rusting quickly, do not apply to non-metals.

What does the efficient use of raw materials involve?

• Using more resources

• Reducing waste

• Ignoring sustainability

• Overproducing items

Answer explanation

The efficient use of raw materials primarily involves reducing waste. This means optimizing resource use to minimize excess and ensure sustainability, rather than using more resources or overproducing items.

What happens to metallic materials under cold weather?

• Stay the same

• Get warmer

• Get colder

• Rust faster

Answer explanation

Metallic materials contract and lose heat in cold weather, causing them to get colder. This is a physical property of metals, as they are good conductors of heat and will reach the ambient temperature.

What is one key benefit of using renewable resources?

• Increases environmental impact

• Provides a continuous supply

• Requires complex technology

• Uses more chemicals

Answer explanation

One key benefit of using renewable resources is that they provide a continuous supply of energy, unlike fossil fuels which are finite. This ensures a more sustainable and reliable energy source for the future.

1. Which of the following is a non-metallic material?

• 1. Aluminium

• 1. Copper

• 1. Wood

• 1. Steel

Answer explanation

Wood is a non-metallic material, while aluminium, copper, and steel are all metals. Non-metals are typically insulators and do not conduct electricity, which is characteristic of wood.

What differentiates non-metallic materials from metallic ones?

• They rust faster

• They produce a sharp sound

• They are less reflective

• They are more durable

Answer explanation

Non-metallic materials are generally less reflective than metallic ones, which tend to have shiny surfaces due to their electron structure. This property helps differentiate them in various applications.

Why is sustainable sourcing essential?

• Increases material wastage

• Ensures certified practices

• Ignores environmental impact

• Lowers quality standards

Answer explanation

Sustainable sourcing is essential because it ensures certified practices that promote environmental responsibility and ethical standards, helping to reduce negative impacts on the planet and society.

How do metallic materials compare in terms of breakability?

• Easier to break than non-metallic materials

• Not easy to break

• Very brittle

• Always softer than non-metallic materials

Answer explanation

Metallic materials are generally strong and ductile, making them not easy to break compared to non-metallic materials. They can withstand significant stress before failing, unlike brittle materials that break easily.