PSLE Science revision 2018

Mingfen hung a wet towel in the bathroom.

Which of the following ways would help to dry the towel faster?

A: fold the towel in half

B: open the door of the bathroom

C: use a hairdryer to blow the towel

• A and B only

• A and C only

• B and C only

• A, B and C

Which of the following is not a matter?

• air

• soil

• light

• water

What would happen after large areas of forests are removed?

• more rain would fall

• more soil would be eroded

• more oxygen would be given out to the air

• more carbon dioxide would be absorbed from the air

Butterflies visit flowers. The butterflies benefit directly by _________.

• dispersing the seeds

• pollinating the flowers

• feeding on the nectar

• laying eggs on the flower

What is generally common among insects and birds?

• They have three body parts

• They reproduce by laying eggs

• Their young look like the adults

• They have the same type of body covering

A bicycle tyre is fully inflated by Ben is still able to pump more air into it. Why is this possible?

• Air has mass

• Air occupies space

• Air does not have a definite shape

• Air does not have a definite volume

Ryan placed a cup of hot water on a wooden table. What could he do to cool the water faster?

• Wrap the cup with a cloth

• Place the cup in a plastic bag

• Place the cup on a metal plate

• Cover the top of the cup with a wooden lid

Which of the following is not an example of energy conversion?

• climbing up a ladder

• cooling hot water in a cup

• lighting a candle with a matchstick

• generating electricity in a power station

Which of the following feature(s) would be most likely found in plants growing in a hot and dry place?

A: swollen stems

B: short roots

C: broad leaves

• A only

• B only

• A and C only

• B and C only

A scientist observed that the temperature of the air on Earth has increased over the last ten years.

Which of the following activities could have caused the increase in the temperature?

A: An increase in the planting of trees

B: An increase in the use of air-conditioners

C: An increase in the use of solar energy

D: An increase in the number of vehicles on the road

• A and B only

• B and D only

• A and C only

• C and D only