Energy Review

The toy oven shown uses a light bulb to bake small cakes. What types of energy does the toy oven use to bake the cakes?

• Electrical and Thermal

• Mechanical and Electrical

• Thermal and Mechanical

• Light and Sound

An old fashioned metal toy is shown below. When the candle is lit, the carousel of horses begins to turn. Which of these correctly describes the energy that makes the carousel turn?

• Heat from the candle produces currents of warm air

• Heat from the candle produces electrical energy

• Light from the candle produces mechanical energy

• Light from the candle produces wind currents.

When a bat searches for prey at night, it makes sounds as it flies, and it uses the sounds echos to find its prey. When the bat flies and listens to echos to locate prey, it is using--

• thermal energy and light energy

• sound energy and thermal energy

• mechanical energy and sound energy

• light energy and mechanical energy

The diagram shows an electrical circuit with four bells that the student plans to build. When the student connects the wires as shown, which of the bells will ring?

• Bell 1 only

• Bells 1 and 4 only

• Bells 3 & 4 only

• Bells 1, 2, 3 and 4

In some circuits that are used for decorating, one burned out light bulb with prevent all the other light bulbs from lighting. In other circuits, one burned out lightbulb will have no effect on the other light bulbs. In which of these circuits will the other light bulbs still light even if one bulb is burned out?

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This circuit has three light bulbs and a bell. Which procedure will result in only the blue light bulbs operating?

• Close switches 1 and 2 and leave switch 3 open.

• Close switch 3 and leave switches 1 and 2 open.

• Close switches 2 and 3 and leave switch 1 open.

• Close switch 2 and leave switches 1 and 3 open.

A string of lights with small bulbs is shown below. The bulbs are connected by wire that is covered with an insulator. When the lights are on, electricity travels in --

• a complete circuit

• a sound wave

• a light ray

• an incomplete path

A teacher takes the top and side off a box. She cuts a hole in another side and puts a candle outside the box, as shown below. When the teacher lights the candle in a dark room, some of the candle light shines through the hole. Which diagram best shows how the light appears on the opposite wall of the box?

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The picture below show a child standing in a swimming pool. Why does the lower part of the child appear so much different in size than the upper part?

• The light rays that travel through water and then into air are refracted.

• The light rays that travel through water and then into air are enlarged.

• The light rays that travel through air and then into water are reflected.

• The light rays that travel through air and then into water are reduced.

Some students paint the inside of several boxes. They paint each box a different color. They observe that the inside of the box painted white looks brighter than the others. What is the most likely reason this box looks brighter?

• More light is reflected off white paint.

• More light is refracted by white paint.

• More light passes through white paint.

• More light is absorbed by white paint.