Unit 7 HMH Review

Vanya toasts a piece of bread in a toaster connected to a wall outlet. Which is the source of energy for the toaster?

• Heat Energy

• Electrical Energy

• Light Energy

• Chemical Energy

Cameron pulled his sisters in a wagon on a flat sidewalk. Which is the source of energy that moves the wagon?

• Chemical Energy in Cameron's muscles

• Potential energy from the ground below

• Kinetic energy from the rolling wheels

• Gravitational energy pulling the wagon

A book falls on the floor. Which is the main form of energy that results when the book strikes the floor?

• Heat Energy

• Sound Energy

• Kinetic Energy

• Chemical Energy

Raju cooks a pizza in a gas oven. Which form of energy cooks the pizza?

• Chemical

• Heat

• Electrical

• Light

Solar energy is one type of alternative energy currently being investigated. Which one is a benefit of solar energy?

• Solar energy is not renewable

• Solar energy does not pollute the air

• Solar energy is the most effective fossil fuel

• Solar energy cannot be converted into other forms of energy

A book on the floor was picked up and then dropped. How does the energy of the book compare to before and after it falls?

• The book has the same potential energy before and after it falls

• The book has more kinetic energy after it falls than it has before it is picked up

• The book has more potential energy before it is picked up than it has after it falls

• The book has less potential energy after it falls than it has before it is picked up

When you pluck a rubber band, it makes a sound. What can you do to make the sound softer?

• Stretch the band so it is longer

• Loosen the band so it is shorter

• Stop moving the band when it begins moving

• Stretch the band less to the side before letting go.

When you plucked the band to the left of the pencil, the sound changed. Which has the highest pitch?

• F

• H

• G

• I

What would you claim about the pitch of the sound of rubber band B compared to rubber band A?

• Higher

• Louder

• Lower

• Softer

The boy's guitar makes a higher sound than the girl's drum. Which reasoning best describes why this might happen?

• The drum has a higher pitch than the guitar

• The drum makes a louder sound than the guitar

• The guitar's parts vibrate, but the drum's parts do not

• The guitar's parts vibrate more quickly than the drum's parts