Science 4 _PT REVIEWER

Which statement is NOT true about force?

• Slicing a banana changes its shape and size.

• A rolling ball on a surface will continue moving unless a force is applied on it.

• A ball moving on top of the table stops when you apply force opposite to the direction of its motion.

• In order to slow down or stop a heavy object, the force applied must be lesser than the mass of that given object.

What would happen if you applied more force on an object in motion?

• An object will begin moving slower.

• An object will begin moving faster.

• An object will begin moving at a constant speed.

• An object will begin moving at a lesser speed.

Suppose you push a door and your friend on the other side of the same door is also pushing it. How will you describe the force and the effect of your actions to the door?

• The door pushes you and your friend.

• The door pushes your friend away from you.

• The force is unbalanced and the door may break.

• The force is balanced and the door does not move.

Which statement correctly describes the picture at the left?

• The two poles are attracted to each other.

• The iron filings formed a shape around the magnet.

• The iron filings show that magnetic field is strongest at both poles.

• The North pole of one bar magnet attracts the south pole of another bar magnet.

What do you think will happen to the speed of the object when the force is applied in the opposite direction to the direction of motion?

• increases

• decreases

• remains the same

• None of the these.

What happens when you focus a pen light through a hole of a thick cloth?

• Light becomes brighter.

• Light changes direction.

• Light passes through the hole.

• Light is blocked.

Which of these describes how light travels through an empty space?

• It travels in a straight line without stopping.

• It comes to a stop after it travels a certain distance.

• It changes direction often even if there are no objects.

• It travels straight but may change direction to avoid objects.

Which nonluminous objects is a natural light source?

• candle

• fire

• moon

• star

Which of the following would be most likely to transmit sound the best?

• steel in cabinet

• air in your classroom

• water in the ocean

• water in a swimming pool

On which place will we not be able to hear any sound?

• a theatre

• in a spaceship

• a closed room

• in the outer space