1. The train is speeding down the track. The faster the train moves the more diesel fuel the train uses. That means the faster the train goes, the more _________ it needs.

• a. force
• b. energy
• c. time
• d. cars

24. Look at the data shown in the pie chart below. Which renewable energy resource was used the most in California in 2016?

• a. wind
• b. geothermal
• c. hydro
• d. solar

29. Why are oil, gas, and coal known as fossil fuels?

• a. Because they are very old
• b. Because they are very dirty and made of rubbish
• c. Because they are very old and made of material that was once alive
• d. Because they are very expensive

30. How is the energy released from materials such as wood, petroleum, or coal?

• a. By shaking the material
• b. By burning the material
• c. By cooling the material
• d. By mixing the material with air

31. Different types of vehicles are powered by different sources of energy. Which of the energy resources powers a bicycle?

• a. food
• b. battery
• c. gas

32. Different types of vehicles are powered by different sources of energy. Which of the energy resources powers an electric car?

• a. food
• b. battery
• c. gas

33. Different types of vehicles are powered by different sources of energy. Which of the energy resources powers a helicopter?

• a. food
• b. battery
• c. gas

34. The following statements describe how a wind turbine works. Which statement is not correct?

• a. The wind pushes the blades of a wind turbine, transferring its motion energy to the turbine.
• b. The turbine stores the energy.
• c. The turbine then drives the generator to create electricity.
• d. The generator produces harmful waste products.

35. Which covering will cause the ice cubes to melt the least?

• a. beaker 1
• b. beaker 2
• c. beaker 3
• d. beaker 4

Hydropower does not cause pollution of the air, as fossil fuels do.

• Advantage

• Disadvantage