PSLE final revision 2021

A cup is used to fill water.

The material for making the cup must be _____________?

• transparent and strong

• transparent and able to float

• waterproof and strong

• waterproof and flexible

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Two unknown materials, P and Q, are placed near to each other. There is no interaction between the two materials.

What could material P be?

• non-magnetic material only

• non-magnetic material or magnetic material only

• magnet or magnetic material only

• magnet, magnetic material or non-magnetic material

In the set-up below, a steel bar was held at position A and a strong magnet was held at position B. The steel bar was attached to a spring which was attached to a fixed support.

When the steel bar was released, the steel bar slide along the table top from position A towards position B.

Which forces acted on the sliding steel bar at position C?

• magnetic force, gravitational force and frictional force only

• magnetic force, elastic spring force and gravitational force only

• frictional force, magnetic force and elastic spring force only

• frictional force, magnetic force, elastic spring force and gravitational force

• 10^oC

• 30^oC

• 90^oC

• 110^oC

Wen Xuan set up the experiment above in a dark room. The light sensor attached at the top of the screen indicated a reading of 100 units.

Wen Xuan moved one item and caused the reading of the sensor to increase to 120 units and the shadow on the screen to become bigger.

Which object did Wen Xuan move and in which direction?

• Move the torch nearer to the screen.

• Move the screen nearer to the torch.

• Move the metal plate nearer to the torch.

• Move the screen further away from the torch.

Jovie set up the experiment below.

After a while, some water droplets were formed on the underside of the glass lid of container.

Which could she do to increase the amount of water droplets formed on the under side of the lid?

• Increase the temperature of water and decrease the number of ice.

• Increase the temperature of water and use a thinner glass lid.

• Increase the size of the container and decrease the number of ice.

• Decrease the size of the container and increase the thickness of the lid.

Which of the following is an example of the effects of a force?

• A balloon gets bigger.

• A beam of light shines on a wall.

• A long shadow casts on the floor.

• Heat flows along a metal rod.

Object X is placed on top of object Y.

Object X became colder after some time.

Which statement below explains why object X became colder?

• Gravity pulled the heat downwards.

• X has a higher temperature than Y.

• X has less mass than Y.

• X is a better heat conductor than Y.

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