PSLE Science Physics Topics 4

Question 1

What is the unit used to measure electrical energy consumption at home?

Accepted Answer

Kilowatt-hour

Answer

Electrical energy consumption is measured in kilowatt-hours (kWh). Your electricity bill is based on how many kWh you use.

Question 2

Which of the following materials allows light to pass through completely?

Accepted Answer

Transparent glass

Answer

Transparent materials like clear glass allow light to pass through completely, so you can see clearly through them.

Question 3

What is the effect of increasing the number of batteries in a circuit (connected in series)?

Accepted Answer

The bulb gets brighter

Answer

Adding more batteries in series increases the total voltage, which pushes more current through the circuit, making the bulb brighter.

Question 4

What type of simple machine is a seesaw?

Accepted Answer

Lever

Answer

A seesaw is a type of lever — it has a fulcrum (pivot point) in the middle and loads on either end.

Question 5

What happens to water when it is heated from 0°C to 100°C?

Accepted Answer

It changes from solid to liquid to gas

Answer

At 0°C, ice melts to water (solid to liquid). As heating continues, at 100°C water boils to steam (liquid to gas).

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