PSLE Science Physics Topics 3

Question 1

How does sound travel?

Accepted Answer

Through vibrations in a medium

Answer

Sound travels through vibrations that pass through a medium (solid, liquid, or gas). It cannot travel through a vacuum.

Question 2

Which of the following objects would be attracted to a magnet?

Accepted Answer

Steel paper clip

Answer

Steel is a magnetic material (it contains iron) and would be attracted to a magnet. Wood, plastic, and glass are not magnetic.

Question 3

What is the process called when a liquid changes to a gas?

Accepted Answer

Evaporation

Answer

Evaporation is when a liquid changes to a gas, usually at the surface of the liquid. When heated to boiling point, it is called boiling.

Question 4

What does a thermometer measure?

Accepted Answer

Temperature

Answer

A thermometer measures temperature, which indicates how hot or cold something is.

Question 5

Which of the following is a non-renewable source of energy?

Accepted Answer

Coal

Answer

Coal is a non-renewable energy source — it takes millions of years to form and will eventually run out.

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