Benchmark 4 Review

What would happen if you increased the amplitude of a wave?

• The wave's frequency would decrease.
• The wave's frequency would also increase.
• The wave's energy would decrease.
• The wave's energy would also increase.

Which of the following is the best example of heat transfer by convection?

• boiling water
• ironing a shirt
• the Sun warming the Earth
• cooking eggs on a pan

The line running from the left end of the wave across to the right is called:

• resting point/line of origin
• crest
• wavelength
• amplitude

Grass appears green because:

• green light is absorbed.
• green light is refracted.
• green light is scattered.
• green light is reflected.

A rise in the temperature inside a kitchen means there is an increase in the __________.

• density of the air molecules
• number of air molecules
• average size of the air molecules
• kinetic energy of the air molecules

The diagram shows a generator powered by windmills. Wind blows across the windmills to turn the blades of the turbine which spin the generators. What energy conversion takes place in the wind turbine generator?

• electrical energy is converted to mechanical energy
• solar energy is converted to thermal energy
• thermal energy is converted to electrical energy
• kinetic energy is converted to electrical energy

What happens when parallel rays of light strike a rough or bumpy surface?

• They reflect off the surface.
• They scatter in different directions.
• They refract through the surface.
• They are absorbed.

The law of refraction states that:

• light does not change
• as light enters a more dense medium, it slows down and bends toward the normal
• as light enters a more dense medium, it speeds up and bends toward the normal
• light reflects off of smooth surfaces

A car battery allows an engine to crank. The engine then allows the car to move from one location to another. Trace the energy transformations shown in the diagram below.

• chemical → mechanical → electrical
• electrical → chemical → mechanical
• chemical → electrical → electrical
• chemical → electrical → mechanical

Nuclear power produces energy without releasing greenhouse gases. While this helps the environment, nuclear power can be harmful. Which of the following is a harmful effect of nuclear power?

• Nuclear power releases carbon dioxide into the atmosphere.
• Nuclear power causes global temperatures to rise.
• Nuclear power produces high levels of air pollution.
• Nuclear power produces high levels of toxic waste.