Science Fair Quiz-Junior High School

Diagram 1 shows a measuring cylinder containing water.

Five identical steel balls are now lowered into the measuring cylinder.

Diagram 2 shows the new water level in the cylinder.

What is the volume of each steel ball?

• 6 cm³

• 14 cm³

• 30 cm³

• 70 cm³

The diagram shows a force being applied to a lever to lift a heavy weight.

Which change would enable the heavy weight to be lifted with smaller force?

• Move the force to the right

• Move the heavy weight to the right

• Move the force to the left

• Move the pivot to the left

A cylindrical can is rolled along the ruler shown in the diagram.

The can rolls over twice.

What is the circumference (distance all round) of the can?

• 13 cm

• 14 cm

• 26 cm

• 28 cm

Passengers are NOT allowed to stand on the upper deck of double-Decker buses.

Why is this?

• They would cause the bus to become less stable.

• They would cause the bus to slow down.

• They would increase the kinetic energy of the bus.

• They would lower the center of mass of the bus.

A telephone engineer connects a wire between two poles when the weather is very cold.

He makes the wire very loose.

The wire passes over a road.

The weather change and it becomes very hot.

What could happen to the wire and why?

• The wire breaks because it contracts

• The wire breaks because it expands

• The wire sags and touches cars on the road because it contracts

• The wire sags and touches cars on the road because it expands

A boy wears a shirt with a letter F on the front.

He stands in front of a plane mirror.

What does he see in the mirror?

• 
• 
• 
• 

When does solar eclipse take place?

• the sun is between the moon and the earth

• the earth is between the moon and the sun

• the moon is between the sun and the earth

• the moon does not lie on the line joining the sun and the earth

This planet is the Roman God of the Sea.

In Greek, it is also called Poseidon.

What is the name of this planet?

• Mercury

• Venus

• Saturn

• Neptune

Astronaut 1 uses a hammer to mend a satellite in space.

Astronaut 2 is nearby.

There is no atmosphere in space.

Compared with the sound heard if they are working on Moon, what does astronaut 2 hear?

• no sound at all

• quieter sound

• a sound of the same loudness

• a louder sound

A heavy table has six legs.

The area of cross-section of each leg is X.

The legs of the table make marks in the carpet.

These marks become deeper with increases pressure.

What would reduce the depth of the marks for the table of a fixed weight?

• using three legs, each of an area smaller than X

• using four legs, each of an area the same as X

• using six legs, each of an area smaller than X

• using eight legs, each of an area the same as X