3rd:B8: Exploring materials

Which of the following objects is made of one material only?

• Pencil

• Handkerchief

• Computer

• Tyre

Mrs Tan wants to make a bag to carry 1 kilogram of rice.

Which one of the following is a reason for not using paper to make the bag?

• Paper is too light.

• Paper creases easily.

• Paper is not waterproof.

• Paper does not allow light to pass through.

Select the characteristics of rubber band and plastic sheet.

• flexible

• hard

• rigid

• all of the above

Select the odd object which differ in material.

• needle

• eraser

• balloon

Plastic is usually used to make water bottles. Which property of plastic is suitable for making water bottles?

• flexible

• waterproof

When we need an object to be strong and allow most light to pass through, we should use _____ .

• paper

• metal

• glass

• wood

To choose the right materials to make an object, we must know the properties of the materials and the uses of the object.

• True

• False

Which one of the properties of materials is important when making a dining chair?

• flexible

• able to float

• Hard (strength)

• able to allow most light to pass through

To make a door of the bathroom, which one of the properties of materials is important?

• flexible

• able to sink in water

• waterproof

Which one of the following is NOT suitable for making a window?

• wood

• glass

• metal

• rubber