Answers to KS3 level 6 questions
19. (a)
any two from
2
· oil
accept ‘petrol
· gas
· uranium or nuclear
accept ‘geothermal’
or ‘peat’
do not accept
‘fossil fuel’ or ‘coal’
(b)
can be grown
accept ‘can be replaced’
1
or more trees can be planted
do not accept ‘can be used again’
or ‘can be recycled’
(c)
any two from
2
· wind
· wave
do not accept
‘water’
· tidal
· solar
accept ‘the Sun’ or ‘sunlight’
· biomass or a stated biomass,
such as straw
accept ‘alcohol’
do not accept
‘wood’
accept ‘hydroelectric’
accept ‘geothermal’ unless
used as the answer to (a)
do not accept
‘nuclear’
(d)
any one from
1
· thermal
accept ‘heat’
· radiant
· light
[6]
20. (a)
(i) While
the book was falling,
ie a Ö
in the second box down
1
its potential energy was
if more than one box is ticked award no
being transformed into
mark
kinetic energy.
(ii)
7.5 or just under 7.5
1
(b)
any one from
1
· transferred to the surroundings
accept ‘goes into the floor or atmosphere’
or spread out into the surroundings
· turned to thermal energy
accept ‘sound’
do not accept
‘light’
do not accept
‘it has changed’
[3]
21.
if more than
one box is ticked in any row award no mark for that row
[5]
22. (a)
larger force on more massive pieces
accept ‘bigger force on bigger pieces’
1
or smaller force on less massive
or ‘smaller
force on little pieces’
pieces
(b) it
increased
accept ‘pulled more’ or ‘got stronger’ 1
or ‘got bigger’
or ‘got greater’
(c) there
was an attractive force
if more than one box is ticked award
1
no mark
(d)
all parts of the comet were pulled
ie a
in
the second box down;
1
towards Jupiter, but the side facing
if more than one box is ticked award
towards the planet was pulled
no mark
more strongly
an attractive force
if more than one box is ticked award
1
no mark
[5]
23.
(a)
there is current in the coil
accept ‘a current flows’ or ‘electricity
1
flows’ or ’circuit
completed’
it becomes an electromagnet
1
or iron core becomes magnetised
iron bolt is attracted to the
accept ‘iron core’ or ‘magnet’ for
1
electromagnet
electromagnet
(b)
any two from
2
· the current stops
do not accept ‘electricity switched off’
or ‘circuit breaks’
· there is no more magnetism
·
bolt pushed back by spring
[5]
24. (a)
(i) C
if more than one box is ticked,
1
award no mark
(ii)
B
if more than one box is ticked,
1
award no mark
(iii)
D
if more than one box is ticked,
1
award no mark
(b)
any one from
1
· the brakes or wheels or tyres
· the surroundings
· the air
· the ground
accept ‘lost as heat’
or ‘soles of shoes’
do not accept
‘the bike’ or ‘the cyclist’
[4]
25. (a)
(i) any
one from
1
· because the ball is positive
accept ‘it has the same charge’
· because it is positive
do not accept ‘it is repelled’
or ‘positive only attracts negative’
· like charges repel
(ii)
a reference to both types of charge should be made or implied
positive charge is attracted
accept ‘the ball is positive so is
1
to negative charge or
attracted by the negative’ or ‘negatives
opposite charges attract
attract positives’ or ‘opposites attract’
(b)
the ball becomes negatively charged
accept ‘the ball loses its positive and
1
becomes negative’ or ‘its charge changes’
any one from
1
· negative charges repel each other
· it is attracted to the positive plate
· it is repelled
accept ‘the ball and
plate neutralise each other and the ball falls away’ for both marks
(c)
any one from
1
· charge cannot flow away
· copper would let the charge flow away
accept ‘it stops the
charge from going’ or ‘it keeps the charge on
the ball’
accept ‘electricity
cannot flow away’
do not accept
‘current cannot flow’
do not
accept ‘insulators do not conduct’
[5]
26. (a)
like charges repel
accept ‘the positive charges would repel 1
or unlike charges attract
each other' or ‘the negative charges
would repel each other' or ‘positive
and negative charges attract'
(b)
(i) award
no mark unless both positive and negative charges are drawn
|
|
the first mark is for
drawing the majority, six or more, of the –ve charges on the right hand
side the second mark is for
drawing at least ten +ve charges distributed uniformly accept the +ve charges
concentrated on the left hand side i.e. accept the following for both
marks
|
2 |
(ii)
the answer must refer to the forces on the charges and not merely
describe how they move
the negative charges are
accept ‘like charges repel' or ‘negative
1
repelled
charges are forced away from each
other'
accept ‘the positive charges are attracted and the negative charges are
repelled'
do not accept ‘the
positive charges are attracted'
do not accept
‘negative charges go away from each other' or ‘the positive charges
do not move'
(c)
the positive charge or the end
accept ‘the negative charge or the
1
which is attracted is closer to the
end which is repelled is further from
negatively charged object
the object'
[5]
27. (a)
(i) oxygen
®
carbon dioxide + water
1
all three substances are required for the mark the products may be in either order
(b)
(i) 200
1
(ii)
any one from
1
· for growth
· for producing meat
· for storage
· for making fat
accept 'for active transport' or ‘for keeping internal organs
running' or ‘for metabolism'
do not accept ‘for keeping
the hen warm’
or 'for breathing'
(c) keep the
hens warm
accept ‘keep them inside ‘or ‘keep
1
them cooped up ‘or ‘stop them moving’
or ‘keep them in deep litter'
or ‘keep them all together'
(d)
any two
from
2
· more energy is available
accept ‘get more eggs’ or ‘get bigger eggs'
for producing eggs
· more energy is available
accept ‘get more meat’ or ‘get bigger hens'
for growth
· the hens do not have to be
accept ‘they can use smaller buildings
fed so much
for the same number of hens'
