KS3 Physics revision worksheet 3 - Energy Resources, Energy Transfers

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					         KS3 Physics revision worksheet 3 - Energy Resources, Energy Transfers, Light, Sound
                                      Exam Question Answers

1.    (a)    (i)    light                                                                   1 (L4)
             (ii)   ripples on water or ripples                                             1 (L4)


      (b)    Sound cannot travel through a vacuum.                                        1 (L4)
                                                 if more than one box is ticked, award no
                                                 mark
                                                                                                     [3]




2.    (a)    • coal                                                                         1 (L4)
             • gas                                                                          1 (L4)
                                                  accept ‘coal fire’ or ‘A’
                                                  accept ‘gas boiler’ or ‘D’
                                                  answers may be in either order
                                                  accept ‘petrol’ or ‘petrol generator’ or ‘C’
                                                  or ‘oil’
                                                  answer may be in either order
                                                  ‘fire’ is insufficient
                                                  ‘boiler’ is insufficient
                                                  ‘generator’ is insufficient

      (b)    (i)    • the Sun                     1 (L4)
                                                  accept ‘solar energy’ or ‘solar’
                                                  accept ‘light’ or ‘sunlight’
                                                  references to heat are insufficient


             (ii)   any one from                                                            1 (L3)
                    • it is dark
                    • no light
                    • the Sun has set
                                                  accept ‘it needs light’
                                                  accept ‘no Sun’
                                                  references to heat are insufficient


      (c)    • wind                                                                         1 (L3)
                                                  accept ‘moving air’ or ‘air’
                                                  accept ‘air currents’




Ballard School                                                                                        1
      (d)    any one from                                                                       1 (L4)
             • Sun or solar energy
             • waves
             • wind
                                                    accept ‘solar panel’ or ‘E’
                                                    accept ‘wave turbine’ or ‘F’
                                                    accept ‘wind turbine’ or ‘turbine’ or ‘B’
                                                    ‘water’ is insufficient
                                                                                                          [6]




3.    (a)    they reflect or scatter light          accept ‘light reflects off it’              1 (L5)
                                                    or ‘light reflects on it’
                                                    do not accept ‘light reflects onto it’
                                                    or ‘light shines on them’
             from the Sun                                                                       1 (L5)


      (b)    it goes into the shadow of the Earth   accept ‘it is eclipsed’ or ‘it is not in the 1 (L6)
                                                    sunlight’ or ‘it is no longer reflecting the
                                                    sunlight’
                                                    accept ‘it goes into the shadow of the Moon’
                                                    or ‘it goes in front of the Moon’
                                                    do not accept ‘it goes behind the Moon’
                                                    or ‘the Moon gets in the way’
                                                    or ‘the satellite tumbles’


      (c)    any one from                                                                       1 (L5)
              weather forecasting
              navigation or position finding
              communications
                                                    accept ‘satellite TV’ or ‘TV’ or ‘telephone’
                                                    or ‘radio’
              astronomy or looking at the stars
              to take pictures of the Earth
                                                    accept ‘spying’ or ‘surveillance’ or ‘to see
                                                    changes in the environment or in land-use’
                                                    accept ‘for defence’ or ‘as weapons’
                                                                                                          [4]




Ballard School                                                                                             2
4.    (a)    pluck them harder                                                              1 (L5)
                                                   ‘make the strings vibrate more or move more
                                                   do not accept ‘make the strings vibrate more
                                                   quickly’


      (b)    The sound has a higher pitch                                                         1 (L5)
                                                   if more than one box is ticked, award no
                                                   mark


      (c)    the sound from the thicker string     accept ‘it has a lower pitch or a lower 1 (L5)
             has a lower pitch or a lower          frequency’
             frequency                             accept ‘the sound from the thicker string is
                                                   louder or ‘it is louder’
                                                   answers must include a comparison ‘it is
                                                   lower’ is insufficient

      (d)    (i)    the sound in A has a           accept’ it has a higher pitch or higher        1 (L6)
                    higher pitch or a higher       frequency’
                    frequency
                                                   answers must show a comparison
                                                   ‘the vibrations are quicker’ is insufficient
                                                   ‘it is higher’ is insufficient


             (ii)   the sound in A is louder       accept ‘it is louder’                      1 (L6)
                                                   accept ‘the sound in C is quieter’
                                                   accept ‘it has a greater amplitude’
                                                   ‘the vibrations are stronger or of greater
                                                   amplitude’ is insufficient
                                                   do not accept ‘it is higher’
                                                                                                           [5]




5.    (a)    (i)    electrical to chemical                                                        1 (L5)
                                                   if more than one box is ticked, award no
                                                   mark
             (ii)   chemical to electrical to sound                                           1 (L5)
                                                  if more than one box is ticked, award no mark


      (b)    Q                                                                                    1 (L6)
             R                                                                                    1 (L6)
             P                                                                                    1 (L6)
                                                                                                           [5]




Ballard School                                                                                              3
6.    (a)    answers must give a definition of biomass and not just provide examples
             material from living things or plant matter                                         1 (L6)



      (b)    the Sun                                 accept ‘sunlight’ or ‘the Big Bang’       1 (L6)
                                                     do not accept ‘light’ or ‘photosynthesis’



      (c)    coal                                                                                1 (L5)
             oil
             natural gas or methane                  answers may be in any order
                                                     all three fossil fuels are required for the
                                                     mark accept ‘gas’
                                                     for natural gas
                                                     accept ‘peat’ as one of the three fossil fuels



      (d)    they cannot be replaced or no more can be produced                             1 (L6)
                                                  accept ‘they get used up’
                                                  do not accept ‘they cannot be used again’



      (e)    (i)    any one from                                                                 1 (L6)

                     it is renewable

                     it is widely available
                                                     accept ‘you can grow more of it’
                                                     accept ‘it will conserve fossil fuels’
                                                     do not accept ‘it is cheaper to produce’
             (ii)   any one from                                                                 1 (L6)

                     it takes up less space

                     it is more suitable for use in vehicles

                     it contains more energy per unit mass
                                                   accept ‘it is more concentrated’
                                                   accept ‘it can be transported more easily’




Ballard School                                                                                            4
             (iii)    any one from                                                                   1 (L6)

                       pollution

                       they release greenhouse gases
                                                    accept a specific example of a pollutant
                                                    eg. ’carbon dioxide is released’
                                                                                                              [7]




7.    (a)    (i)      • only red light passes through the filter                                1 (L7)
                                                     accept ‘the other colours are filtered out
                                                     or absorbed’
                                                     ‘red light passes through’ is insufficient
                                                     a mark for this answer may be awarded in
                                                     either a i or a ii provided there is no
                                                     contradiction
                      • the ball reflects red light                                                  1 (L7)
                                                       accept ‘white objects reflect all colours’


             (ii)     black                                                                          1 (L7)
                                                       accept ‘you cannot see it’
                     any one from                                                                    1 (L7)
                      • the green ball does not reflect red light or the light that passes through
                        the filter
                      • the ball absorbs red light
                                                       accept ‘no green light reaches the ball’


      (b)    two red spots                                                                           1 (L7)
                                                       accept ‘red black red’
                                                       ‘two spots’ is insufficient
                                                       ‘red spots’ is insufficient
                                                       do not accept ‘only red light’
                                                                                                              [5]




Ballard School                                                                                                 5
8.    (a)    (i)    Paul                                                                       1 (L7)
                    James
                    Sylvia
                                                   accept ‘light’
                                                   accept ‘vibration’
                                                   accept ‘sound’
                                                   answers must be in the correct order
                                                   all three answers in the correct order
                                                   are required for the mark

             (ii)   3                              accept ' 1020 '                             1 (L7)
                                                             340

      (b)    (i)    the energy or the sound is more spread out                               1 (L7)
                                                    accept ‘some of the sound is absorbed by the
                                                    air’
                                                    accept ‘the amplitude decreases’
                                                    ‘vibrations decrease’ is insufficient


             (ii)                                                                              2 (L7)




                                                   award one mark for a wave with a
                                                   smaller amplitude
                                                   award one mark for a wave with the
                                                   same frequency
                                                   award the marks for a wave with the correct
                                                   amplitude and frequency but which is
                                                   not centred
                                                   on the middle line of the grid or which
                                                   is not in phase with the drawn wave
                                                   the marks may be awarded for a wave drawn
                                                   on Sylvia’s grid
                                                                                                        [5]




9.    (a)    distance travelled by pulse = 7.5m    accept ‘time to sea bed = 0.0025s’              1
             depth of sea = 3.75m                  the unit is required for the mark               1
                                                   consequential marking applies
                                                   accept half the distance travelled by the
                                                   pulse accept the correct answer with no
                                                   working for both marks


Ballard School                                                                                           6
      (b)    any one from                                                                           1
              the energy spreads out                accept ‘it or the signal spreads out’


              the energy is absorbed by the water
                                                     accept ‘it or the signal is absorbed by the
                                                     water’
                                                     accept ‘it is drowned out by noise’
                                                     accept ‘the echo sounder or the signal made
                                                     by the echo sounder is not powerful enough’
                                                     do not accept ‘the signal is not powerful
                                                     enough’


      (c)    because the speed of sound in air is different from that in water                      1
                                                     accept ‘the speed of sound in air is less’
                                                     accept ‘the speed of sound in air is 330m/s’
                                                                                                        [4]



10.   (a)    (i)    oxygen-oxygen or O–O                                                            1


             (ii)   Answers may be in either order
                    carbon-oxygen or C–O             accept ‘oxygen–carbon’                         1
                                                     do not accept ‘carbon dioxide’
                    hydrogen-oxygen or H–O           accept ‘oxygen–hydrogen’                       1
                                                     do not accept ‘water’


      (b)    any one from                                                                           1
              heat is produced                      accept ‘the reaction is exothermic’
              the temperature goes up               do not accept ‘energy is released’
                                                                                                        [4]




Ballard School                                                                                           7