AQA A-level COMPUTER SCIENCE 7517/2 Paper 2 Version: 1.0 Final *JUN* IB/G/Jun23/E7 7517/2QUESTION PAPER & MARKING SCHEMEJune 2023
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Module
Computer science
Institution
University Of South Africa
Examiners are required to assign each of the candidates’ responses to the most appropriate level according to its overall quality, then allocate a single mark within the level. When deciding upon a mark in a level examiners should bear in mind the relative weightings of the assessment objectives....
AQA A-level
7517/2 PaperCOMPUTER
2 Version: SCIENCE
1.0 Final
*JUN* IB/G/Jun23/E7
7517/2QUESTION PAPER2023
&
MARKING SCHEMEJune
A-level Computer
To Examiners:
• When to award '0' (zero) when inputting marks on CMI+
A mark of 0 should be awarded where a candidate has
attempted a question but failed to write anything credit
worthy.
Insert a hyphen when a candidate has not
attempted a question, so that eventually the
Principal Examiner will be able to distinguish
between the two (not attempted / nothing credit
worthy) in any statistics.
• This mark scheme contains the correct responses
which we believe that candidates are most likely to
give. Other valid responses are possible to some
questions and should be credited. Examiners should
refer responses that are not covered by the mark
scheme, but which they deem creditworthy, to a Team
Leader.
The following annotation is used in the mark
scheme:
; - means a single mark
// - means alternative response
/ - means an alternative word or sub-phrase
A. - means acceptable creditworthy answer
• - means reject answer as not creditworthy
NE. - means not enough
• - means ignore
DPT. - in some questions a specific error
made by a candidate, if repeated, could
result in the loss of more than one
mark. The DPT label indicates that this
mistake should only result in a
candidate losing one mark on the first
occasion that the error is made.
Provided that the answer remains
, understandable, subsequent marks
should be awarded as if the error was not
being repeated.
Examiners are required to assign each of the
candidates’ responses to the most appropriate
level according to its overall quality, then allocate
a single mark within the level. When deciding
upon a mark in a level examiners should bear in
mind the relative weightings of the assessment
objectives.
eg
In the following questions, the marks available are
as follows:
Q Pt Marking T
u guidance a
m
k
01 1 Award
if correct final answer is shown: 16 // 24
If final answer is not given then award if correct
calculation is shown:
400 1000 8
1000 800
2
If final answer is not correct or overall
calculation is not clear then award one for each
of the points listed below:
• multiplying 400 by 1000 // 400 000 shown in
working;
• dividing 3 200 000 or 400 000 or 8000 or 3200
or 400 or 8 by a number;
• multiplying 1000 by 800 // 800 000 shown in
working;
• multiplying by 8 to convert from bytes to bits;
• colour depth calculated as 4;
• showing 2x as the last stage of the working,
where x is the value calculated so far;
,Q Pt Marking T
u guidance a
m
k
01 2
Bitmap images store the colour of each pixel //
vector graphics do not need to store the
colour of each pixel;
A. data about pixel instead of colour, but R. just
storing pixels
The image contains 800 000 pixels // images can
contain lots of pixels;
Vector graphics store information about /
properties of the objects that an image is
composed of;
A. “shapes” for “object”
R. “equations” for “object”
R. “instructions” for “object” unless clear that
instructions are descriptions of objects
A. examples of properties/information instead of
the actual words, if there are at least two valid
examples
NE. vector graphics are composed of
objects without reference to
properties/information
It takes only a small amount of memory to store
the properties of an object;
(Large) images can be composed of relatively few
objects // there will be fewer objects than there
would be pixels // a single object might be
equivalent to many pixels;
Max 3
Q Pt Marking T
u guidance a
m
k
, 01 3 All marks AO1 (understanding)
Individual objects / components / parts of the
image can be manipulated / edited / duplicated /
copied independently;
NE. images are easy to edit
The image / individual objects / components /
parts of the image can be enlarged / scaled
without loss of quality / without becoming
pixelated // vector graphics are resolution
independent;
A. zoomed in” for enlarged
NE. easy to scale
If an object / component is deleted, the
software knows what is behind it // no “hole”
is left in the image;
R. faster transmission times (as a direct
consequence of fewer bytes, given in
question)
Max 2
Q Pt Marking T
u guidance a
m
k
02
What it is
Processing is carried out // applications/programs
are executed on an application server (A. server);
NE. Resources are stored on the server
Why selected
Clients are cheaper to purchase // clients can
have lower hardware specification;
NE. cheaper without further explanation
Less configuration of clients is necessary // easier
to configure/add a new client // easier to replace a
client;
Simpler installation/updating of software (as only
done on server);
R. if implication that software is on client
Impossible to install unauthorised software on
workstations // more secure as fewer settings
can be changed;
Workstations consume less electricity/power;
Licensing can be cheaper (as licence per
active user not per client); Longer MTBF for
workstations // workstations do not
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