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6. energy can be created and destroyed

  • false
  • true

7. biomass/bio fuels are...

  • thermal energy of biological matter- electrical energy
  • chemical energy- thermal energy in burning
  • kinetic energy of biological matter- thermal energy in burning
  • chemical energy- potential energy

8. energy efficiency=

  • useful output energy/ total input energy
  • total input energy/ useful output energy
  • total input energy x useful output energy
  • calories eaten for dinner/ price of fish and chips

9. which one of these is NOT a form of energy

  • electrical
  • nuclear
  • chemical
  • elastic potenial
  • kinetic
  • thermal
  • sound
  • friction
  • light
  • gravitational potential

10. useful and total energy is measured in...

  • millimetres
  • joules
  • kilograms
  • ounces

11. hydroelectric power is...

  • chemical energy of the raised water- thermal energy
  • gravitational energy of the raised water- electrical energy
  • kinetic energy of the raised water- electrical energy
  • gravitational energy of the raised water- thermal energy

12. tidal power is...

  • kinetic energy of the water- thermal energy
  • kinetic energy of the water- electrical energy
  • chemical energy of the water- gravitational potential energy
  • thermal energy of the water-electrical energy

13. payback time=

  • saved money x income
  • cost x savings per year
  • cost / savings per year
  • savings per year / cost

14. what causes energy losses

  • current, drag, potential
  • flying, speed, drinking
  • friction, noise, vibrations
  • air resistance, friction, sound, current
  • pull, drag, chemical

15. wind energy is...

  • chemical energy of the wind-electrical energy
  • kinetic energy of the wind- electrical energy
  • gravitational energy of the wind- thermal energy
  • kinetic energy of the wind- thermal energy

16. power=

  • time it takes to get to school x number of lessons
  • energy transferred/ time taken
  • time taken / energy transferred
  • energy transferred x time taken

17. solar power is...

  • light/thermal energy from the sun- thermal energy of the water/ electrical energy for electricity
  • heat energy of the sun- thermal energy of the water/ electrical energy for electricity
  • light/thermal energy from the sun- electrical energy
  • kinetic energy of the sun- thermal energy

18. what reduces the efficiency of a machine?

  • eating a burger
  • movement
  • energy losses
  • walking away from it

19. wave power is...

  • chemical energy of the water- kinetic potential energy
  • kinetic energy of the water- electrical energy
  • chemical energy of the water- thermal energy
  • kinetic energy of the water- gravitational potential energy