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6. which statement is correct

  • dark colours are good emitters and absorbers of radiation
  • light colours are good emitters and absorbers of radiation
  • dark colours are good emitters and poor absorbers of radiation
  • dark colours are poor emitters but good absorbers of radiation

7. the surface of which material would reflect infrared radiation the best

  • white and shiny
  • grey and dull
  • white and dull
  • black and shiny

8. how can you find the power of an appliance

  • see what voltage it needs
  • look for the power rating on the label
  • see how hot it gets when switched on
  • look for the efficiency label

9. which statement about evaporation is not true

  • when some of a liquid evaporates, it is the particles moving the fastest that escape and form a gas
  • sweating cools us down when the sweat evaporates
  • when some of a liquid evaporates the liquid left is warmer than before
  • evaporation can happen at any temperature at which the substance is a liquid

10. which kind of appliances transfer the most energy

  • heaters and cookers
  • lights
  • tvs and radios
  • computers

11. which list of materials shows only insulating materials

  • iron, copper, steel
  • plastic, aluminium foil, wood
  • feathers, wood, carpets
  • wool, feathers, copper

12. why does cold air near an ice lolly move downward

  • it is colder and denser than the air further away from it
  • it is warmer and denser than the air further away from it
  • it is colder and less dense than the air further away from it
  • it is warmer and less dense than the air further away from it

13. if you leave a cup of hot tea standing in the kitchen for a whole day, what will happen

  • energy will be transferred from the tea to the air in the kitchen, so the tea will end up colder than the air in the kithcen
  • no energy will be transferred
  • energy will be transferred from the tea to the air until the tea is the same temperature as the air
  • it will gain energy from the air in the kitchen

14. what are the units for measuring energy

  • degrees celsius
  • degrees fahrenheit
  • joules
  • newtons

15. when one of a piece of metal is heated

  • the energy does not move through the metal
  • the particles vibrate more and the vibrations are passed from particle to particle
  • the particles vibrate less and so the particles get closer together
  • the particles get bigger

16. what does 'payback time' mean

  • the time it takes to save enough money on energy bills to pay for a change
  • the time it takes to pay of the loan on a new appliance
  • how long a new appliance will last without needing repairs

17. the efficiency of an appliance is calculated by

  • comparing the useful energy transferred to the total energy supplied
  • comparing the wasted energy transferred to the total energy supplied
  • comparing the useful and wasted energies
  • measuring how much energy is transferred

18. infrared radiation can travel through

  • empty space and transparent materials
  • empty space only
  • transparent objects only
  • opaque objects

19. solids are better heat conductors than liquids or gases because

  • the particles in a solid cannot move
  • the particles are closer together in gases
  • the particles are closer together in solids
  • the particles are closer together in liquids