S4Q3

Which of the following materials is a soft object?

• cotton

• glass

• rock

• wood

What happens when a soft object is squeezed?

A. shatters into pieces

B. changes its shape and size

C. maintains its shape and size

D. becomes harder and more rigid

• A

• B

• C

• D

During an art activity, pupils are using clay to create sculptures. What should they do to the clay to make it easier to shape?

A. chill the clay in the refrigerator

B. expose the clay under the sunlight

C. add a small amount of water into the clay

D. let the clay dry out completely before working with it

• A

• B

• C

• D

Ben places a piece of sponge, metal spoon and an eggshell on a table. He applied the same amount of force to each object. Which object is expected to deform the most, and why?

A. The eggshell, because it is soft and will change easily under force applied.

B. The metal spoon, because it is hard and will deform more under force applied.

C. The sponge, because it is soft and absorbs the force leading to deformation of object.

D. All objects will deform equally because they are subjected to the same amount of force.

• A

• B

• C

• D

In a classroom activity, you need to select two objects to show which one is easier to move and which one is harder to move based on the rigidity and softness of the object. Which statement is most accurate for selecting the objects?

A. Choose the sponge and rubber ball to show that both are easy to move regardless of their rigidity.

B. Choose the wooden block and metal rod to show that both are hard to move and do not change shape easily.

C. Choose the rubber ball and wooden block to show that the rubber ball is easy to move and wooden block is hard to move.

D. Choose sponge and metal rod to show that the sponge is easy to move and changes shape easily while metal rod is hard to move and does not change shape easily.

• A

• B

• C

• D

Which object can be attracted by a magnet?

A. iron rod

B. glass bottle

C. rubber band

D. bamboo stick

• A

• B

• C

• D

You have two magnets placed on the table and you place a metal paper clip between the two magnets. If magnet A is moved closer to a metal paperclip, while magnet B is kept at a distance, what will happen to the paperclip? The paperclip will ________.

A. not move

B. move towards magnet A

C. move towards magnet B

D. move away from both magnet A and B

• A

• B

• C

• D

Ana is conducting an experiment on how many thumbtacks will be attracted to her magnet. On her first try, 6 thumbtacks were attracted to the magnet. What should Ana have to do to if she plans to increase the number of thumbtacks attracted to the magnet?

A. use bigger size magnet

B. use smaller size magnet

C. break the magnet into half

D. increase the distance of magnet from the object

• A

• B

• C

• D

A pupil places a bar magnet above a steel paperclip without touching it. The paperclip moves towards the magnet and sticks to it. The pupil then tries the same with a plastic spoon but the spoon did not move towards the magnet. Why does the paperclip move towards the magnet, but the plastic spoon does not?

A. The paperclip is too large for the magnet to attract.

B. The magnet can only attract objects that are very close to it.

C. The plastic spoon is heavier than the paperclip, so it is not affected by the magnet.

D. The magnet attracts the paperclip because it is made of metal, while the plastic is not magnetic

• A

• B

• C

• D

The Grade 4 pupils perform an experiment with two bar magnets. They noticed that when they bring the north pole to one magnet close to the north pole of the other magnet, the magnets push apart. When they bring the north pole of one magnet close to the south pole of the other magnet, the magnets attract each other. What is the best explanation why magnets repel in one case and attract in the other?

A. Opposite poles of magnets attract, while like poles repel each other.

B. The magnets repel each other because they are made of the same materials.

C. Magnets always repel each other but attraction occurs only when the magnets touch to each other.

D. Magnets always attract to each other, but the force is weaker when they are farther apart.

• A

• B

• C

• D