Unit 7 - Energy Quiz (ADV)

1. This flashlight uses three different forms of energy. Which of these shows the energy transformations in the correct order?

• Mechanical → thermal → chemical
• Thermal → chemical → electrical
• Chemical → electrical → radiant
• Electrical → mechanical → radiant

2. Jane puts some water into an electric kettle and then she connects it to the power source. She observes that after some time, the water inside the kettle heats up and begins to boil. What is happening?

• Light energy is transforming into thermal energy
• Thermal energy is transforming into electrical energy
• Electrical energy is transforming into thermal energy
• Electrical energy is transforming into light and sound energy.

3. The purpose of a nuclear power plant is to transform nuclear energy into electrical energy. This is done in steps starting with a nuclear reaction (fission) which generates heat to produce steam. The steam turns a generator to produce electricity. Which answer best illustrates these energy transformations?

• nuclear --> mechanical --> chemical --> electrical
• thermal --> nuclear --> mechanical --> electrical
• mechanical --> thermal --> nuclear --> electrical
• nuclear --> thermal --> mechanical --> electrical

4. Determine which scenario below best fits the graph below of potential energy and time.

• a car accelerating on the highway
• a roller coaster ride, from the start to the finish
• an apple falling from a tree
• a bird flying at a constant velocity with no change in elevation

5. Wind turbines can generate a great deal of electricity, and have become popular because there is no cost to use wind, wind turbines don't emit greenhouse gases and have several other benefits. A typical wind turbine has an efficiency of 30%, calculated as the amount of electrical energy generated divided by the maximum potential energy. What is the most likely source of "wasted" energy?

• thermal
• potential
• nuclear
• chemical

6. As a pendulum swings back and forth, some of the energy of the pendulum is ___________________________.

• kinetic
• potential
• elastic
• kinetic and some is potential.

7. Which is the best example of kinetic energy?

• a car parked on a steep hill
• a tennis ball rolling across the court
• a picture hanging on the wall
• a piece of coal before it's burned

8. Conservation of energy means....

• energy can be created but not destroyed
• energy can be destroyed but not created
• energy can both be created and destroyed
• energy can neither be created nor destroyed

9. In the image, kinetic energy is being transformed into potential energy at which points?

• point A to point B
• point B to point C
• At point A only
• At point C only

10. In the image, potential energy is being transformed into kinetic energy at which points?

• point A to point B
• point B to Point C
• At point B only
• At point A only and Point B only