Sinking and floating - Refraction

What force pulls objects down into the water?

• Friction

• Upthrust

• Gravity

• Air pressure

What force helps objects float in water?

• Gravity

• Magnetic force

• Friction

• Upthrust

What happens when the upthrust is equal to the weight?

• The object will sink

• The object will float

• The object will vibrate

• The object will melt

Who discovered the principle explaining buoyancy?

• Newton

• Archimedes

• Einstein

• Galileo

What is refraction?

• Bending sound

• Bending light when it moves to a different medium

• Reflecting light from a mirror

• Spreading water waves

A spoon looks bent in a glass of water because:

• The spoon is broken

• Water reflects light

• Light is refracted

• There is no air in the water

What happens to light when it moves from air into water?

• It speeds up

• It stops

• It bends

• It reflects back

Which of the following is an example of an optical illusion?

• Rainbow after rain

• The moon changing color

• A pencil looks bent in water

• A shadow on the wall

Which part of the circuit provides energy?

• Light bulb

• Wire

• Switch

• Battery

In which type of circuit does the bulb shine brighter?

• Open circuit

• Faulty circuit

• Series circuit

• Parallel circuit