PSLE Science Chemistry Topics 3

Question 1

Which property of a material describes how well it transfers heat?

Accepted Answer

Thermal conductivity

Answer

Thermal conductivity describes how readily a material allows heat energy to pass through it — metals generally have high thermal conductivity.

Question 2

Which of the following materials is the best conductor of electricity?

Accepted Answer

Copper

Answer

Copper is an excellent electrical conductor, which is why it is widely used in electrical wires and circuits.

Question 3

What does it mean when a material is described as 'magnetic'?

Accepted Answer

It is attracted to a magnet

Answer

A magnetic material is one that is attracted to a magnet — examples include iron, steel, and nickel.

Question 4

Which material is most suitable for making a waterproof raincoat?

Accepted Answer

Rubber

Answer

Rubber is waterproof and flexible, making it ideal for raincoats and waterproof gear that must keep water out.

Question 5

A material that allows light to pass through it so that objects behind it can be seen clearly is called:

Accepted Answer

Transparent

Answer

Transparent materials such as clear glass allow light to pass through completely, making objects behind them clearly visible.

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