Unit test review

Which energy transformation takes place when using a power drill?

• heat to mechanical
• chemical to electrical
• mechanical to chemical
• electrical to mechanical

The primary function of a doorbell circuit is to convert electrical energy into

• sound
• motion
• radiant energy
• chemical energy

Riding a bicycle produces several forms of energy. Which form of energy is produced in the greatest amount by pedaling a bicycle down the sidewalk?

• chemical
• radiant
• kinetic
• sound

A wire is wrapped around a metal nail and connected to a battery. If the battery is active, the nail will

• vibrate
• create sound
• produce heat
• become magnetic

A hurricane is a heat engine which converts one kind of energy into another. Hurricanes convert most of the heat energy into

• chemical energy
• electrical energy
• mechanical energy
• potential energy

Which device can change mechanical energy into electrical energy?

• wind turbine
• hair dyer
• light switch
• solar panel

Which of the following is the best example of potential energy?

• a fallen rock
• a burning match
• a liter of gasoline
• a red-hot piece of iron

Which is an example of a form of electrical energy?

• lightning
• windmill
• radio waves
• sound waves

Joseph hypothesizes that a new type of light bulb uses about half the energy of regular light bulbs. To test his hypothesis, Jospeh uses a regular light bulb in a reading lamp for one month. Then, he uses the new light bulb in the same lamp the next month. How can Joseph make sure his investigation is fair?

• use both light bulbs for the same number of minutes
• conduct the investigation for two months instead of one
• conduct the investigation again with a different hypothesis
• replace more regular light bulbs in his house with the new light bulb

When a family returned home from a vacation, they observed that their lawn was brown, but the neighbor's lawn was still green. What most likely happened while the family was away?

• an insecticide was sprayed in the neighborhood
• deer came in and grazed their lawn down to the roots
• the neighbors scattered grass seed each time it rained
• the neighbors watered their lawn because there was no rain