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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