computer science marked exemplars for website
TRANSCRIPT
Exemplar Pack:Components 1 and 2
GCSE (9-1) Computer Science
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science (1CP1)
Contents:
Exemplar Pack GCSE Computer Science (9-1)
Component 1 Candidate 1 marked
Component 1 Candidate 9 marked
Component 1 Mark Scheme
Component 2 Candidate 15 marked
Component 2 Candidate 17 marked
Component 2 Mark Scheme
1
3
9
15
19
26
33
Exemplar Pack GCSE Computer Science (9-1)
About this exemplar pack
This pack has been produced to support Computer Science teachers delivering
the new GCSE Computer Science (9-1) specification (first assessment summer
2018).
The pack contains exemplar student responses to GCSE Computer Science (9-1)
Components 1 and 2. It shows real student responses to a selection of
questions taken from the sample assessment materials. Examiners’ comments
are included.
The students were AS students in the fourth month of their course who had not
done GCSE Computer Science, so there were some topics which they had not
covered at that stage.
Assessment Objectives
There are three Assessment Objectives which are assessed in this qualification.
Assessment Objective Weighting
A01 Demonstrate knowledge and understanding of the
key concepts and principles of computer science
30%
A02 Apply knowledge and understanding of key concepts
and principles of computer science
40%
A03 Analyse problems in computational terms:
• To make reasoned judgements
• To design, program, evaluate and refine
solutions
30%
These Assessment Objectives are spread over the three components as follows:
Component
Assessment Objectives Total for all
Assessment
Objectives A01 % A02 % A03 %
Component 1: Principles of
Computer Science
22 18 0 40
Component 2: Application of
Computational Thinking
8 17.5 14.5 40
Component 3: Project 0 4.5 15.5 20
Total for GCSE 30 40 30 100%
1
Question Types
A selection of questions have been chosen as exemplars to cover different
command words, styles of questions and topics.
Mark Schemes
This pack includes mark schemes for the exemplar questions only. It is
important to note that these questions and mark schemes are from the Sample
Assessment Materials; for live papers additional answers may be added during
moderation.
The complete Sample Assessment Materials can be found at Sample Assessment
Materials Computer Science.
2
3
4
5
6
7
8
9
10
11
12
13
14
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
4(a
) A d
escr
iption
tha
t m
akes
ref
eren
ce t
o th
e fo
llow
ing
poin
ts:
•th
e pr
otoc
ol a
llow
s th
e de
vice
s on
a n
etw
ork
to c
omm
unic
ate
with
each
oth
er (
1)•
by t
he u
se o
f a
com
mon
set
of
rule
s (1
)(2
)
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
4(b
) An
expl
anat
ion
that
mak
es r
efer
ence
to
the
follo
win
g po
ints
: •
A p
atch
will
fix
any
kno
wn
secu
rity
issu
es (
1)•
so t
he m
achi
ne r
unni
ng t
he a
pplic
atio
n is
less
vul
nera
ble
to s
ucce
ssfu
lcy
bera
ttac
ks (
1)(2
)
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
4(c
) A d
escr
iption
tha
t m
akes
ref
eren
ce t
o th
e fo
llow
ing
poin
ts:
•de
vice
B p
uts
the
addr
ess
of d
evic
e C
into
a p
acke
t/m
essa
ge t
o se
nd (
1)•
then
dev
ice
A r
eads
tha
t ad
dres
s an
d se
nds
the
pack
et t
o de
vice
C (
1)(2
)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
36
15
Que
stio
n N
umbe
r In
dica
tive
con
tent
M
ark
4(d
) In
dica
tive
con
tent
: •
The
scho
ol/t
echn
ical
tea
m w
ill b
e re
spon
sibl
e fo
r ba
ckin
g up
/dis
aste
r re
cove
ry if
the
dat
a is
sto
red
on h
ard
disc
s(c
onne
cted
to
the
scho
ol's
ser
vers
) •
The
stor
age
prov
ider
is r
espo
nsib
le f
or b
acku
p/di
sast
er r
ecov
ery
if th
e sc
hool
sto
res
its
data
in t
he 'c
loud
'•
The
scho
ol's
file
s ar
e av
aila
ble
witho
ut a
n in
tern
et c
onne
ctio
n if
data
is s
tore
d on
har
d di
scs
(con
nect
ed t
o th
esc
hool
's s
erve
rs)
•An
inte
rnet
con
nect
ion
is r
equi
red
to a
cces
s th
e sc
hool
's f
iles
if th
ey a
re s
tore
d in
the
'clo
ud'
•Sta
ff a
t th
e sc
hool
can
acc
ess
thei
r fil
es a
nyw
here
by
usin
g m
obile
dev
ices
if t
he s
choo
l's f
iles
are
stor
ed in
the
'clo
ud'
•Th
e st
aff
can
acce
ss t
heir
file
s at
sch
ool o
nly
if th
e da
ta is
sto
red
on h
ard
disc
s (c
onne
cted
to
the
scho
ol's
ser
vers
)•
The
scho
ol w
ill b
e re
spon
sibl
e fo
r m
aint
aini
ng t
he s
erve
rs,
repl
acin
g th
em w
hen
they
age
/tec
hnol
ogy
beco
mes
outd
ated
•Th
e st
orag
e pr
ovid
er is
res
pons
ible
for
upd
atin
g th
e st
orag
e sy
stem
in t
he c
loud
and
pro
vidi
ng n
ew t
echn
olog
y as
it e
volv
es•
The
scho
ol w
ill b
e re
spon
sibl
e fo
r in
crea
sing
the
sto
rage
cap
acity
of t
heir
ser
vers
as
dem
ands
evo
lve
•Th
e st
orag
e pr
ovid
er is
abl
e to
pro
vide
add
itio
nal s
tora
ge s
pace
on
dem
and.
(6)
Leve
l M
ark
Des
crip
tor
0 N
o re
war
dabl
e co
nten
t.
Leve
l 1
1–2
A c
ompa
riso
n m
ay b
e at
tem
pted
but
with
limited
app
licat
ion
of k
now
ledg
e an
d un
ders
tand
ing
of k
ey c
once
pts
of
com
pute
r sc
ienc
e to
the
the
oret
ical
con
text
.
The
com
pari
son
will
con
tain
bas
ic in
form
atio
n w
ith
som
e at
tem
pt m
ade
to li
nk k
now
ledg
e an
d un
ders
tand
ing
to
the
give
n co
ntex
t.
Leve
l 2
3–4
A c
ompa
riso
n w
ill b
e gi
ven
with
adeq
uate
app
licat
ion
of k
now
ledg
e an
d un
ders
tand
ing
of k
ey c
once
pts
of
com
pute
r sc
ienc
e to
the
the
oret
ical
con
text
. Are
occ
asio
nally
sup
port
ed t
hrou
gh a
link
age.
The
com
pari
son
show
s so
me
linka
ges
and
lines
of
reas
onin
g w
ith
som
e st
ruct
ure.
Le
vel 3
5–
6 A c
ompa
riso
n w
ill b
e gi
ven
with
com
preh
ensi
ve a
pplic
atio
n of
kno
wle
dge
and
unde
rsta
ndin
g of
key
con
cept
s of
co
mpu
ter
scie
nce
to t
he t
heor
etic
al c
onte
xt.
Line
(s)
of r
easo
ning
are
sup
port
ed t
hrou
ghou
t by
sus
tain
ed
appl
icat
ion
of r
elev
ant
evid
ence
.
The
com
pari
son
show
s a
wel
l-de
velo
ped
and
sust
aine
d lin
es o
f re
ason
ing
whi
ch is
cle
ar,
cohe
rent
and
logi
cally
st
ruct
ured
.
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
37
16
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
6(a
) A s
tate
men
t th
at in
clud
es:
•an
alg
orithm
is a
seq
uenc
e of
ste
ps/s
tep-
by-s
tep
inst
ruct
ions
(1)
•w
hich
(if
follo
wed
exa
ctly
) w
ill p
erfo
rm a
spe
cific
tas
k (1
)(2
)
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
6(b
) Tw
o re
ason
s:
•En
cryp
ted
data
is e
ncod
ed/s
cram
bled
so
that
it c
anno
t be
und
erst
ood
(1)
•Th
e un
auth
oris
ed p
erso
n w
ould
not
hav
e th
e ke
y to
dec
rypt
the
dat
a (1
)
•D
isre
gard
res
pons
esin
dica
ting
‘acc
ess’
;en
cryp
tion
onl
y m
akes
the
data
uni
nter
pret
able
.•
Do
not
awar
d se
cure
/sec
ret
alon
e.(2
)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
40
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
6(c
) •
App
lyin
g a
doub
le s
hift
to
‘pin
k’ t
o ob
tain
uns
p (1
)•
Iden
tify
ing
+5
as t
he e
quiv
alen
t si
ngle
shi
ft t
o ob
tain
uns
p (1
)•
Rec
ogni
se t
hat
both
shi
fts
give
the
sam
e re
sult,
so t
he d
oubl
e sh
ift is
no
mor
ese
cure
tha
n th
e si
ngle
shi
ft (
1)
pink
pi
nk
+7
wpu
r +
5 un
sp
-2
unsp
Oth
er f
orm
s of
dia
gram
s ar
e ac
cept
able
. A s
impl
e st
atem
ent
to s
ay t
hat
the
doub
le s
hift
is n
ot a
s se
cure
can
sco
re a
mar
k on
ly if
ex
plai
ned
in f
ull.
(3)
Que
stio
ns 6
(d)
and
6(e)
hav
e be
en d
elet
ed.
17
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
6(f
) An
expl
anat
ion
that
mak
es r
efer
ence
to
the
follo
win
g po
ints
: •
The
set-
top
box
mus
t pr
oces
s da
ta q
uick
ly (
1)•
so a
com
pile
r is
use
d be
caus
e co
mpi
led
code
run
s fa
ster
tha
n in
terp
rete
d co
de(1
)
•D
isre
gard
ref
eren
ce t
ocr
oss-
plat
form
s; q
uest
ion
cont
ext
is a
new
chi
p.(2
)
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
6(g
) A s
tate
men
t th
at in
clud
es:
•(A
bstr
acting
mea
ns)
rem
ovin
g un
nece
ssar
y de
tail/
sim
plify
ing
(1)
•so
tha
t w
e ca
n fo
cus
on t
he e
ssen
ce/r
eal p
art/
impo
rtan
t pa
rt o
f th
e pr
oble
m (
1)(2
)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
42
Que
stio
n N
umbe
r Add
itio
nal G
uida
nce
Mar
k
6(h
)(i)
Ans
wer
A s
tate
men
t th
at in
clud
es:
•Th
e pu
rpos
e of
‘rol
l’ is
to
gene
rate
a s
ingl
e nu
mbe
r, c
hose
n ra
ndom
ly,
betw
een 2
and
12,
incl
usiv
e (1
) O
R
•Tw
o nu
mbe
rs b
etw
een
1 an
d 6
•Acc
ept
betw
een
1 an
d 12
•D
o no
t aw
ard
‘sim
ulat
e a
roll
of d
ice’
or
equi
vale
nt.
(1)
Que
stio
n N
umbe
r Add
itio
nal G
uida
nce
Mar
k
6(h
)(ii
)
Ans
wer
One
of
the
follo
win
g re
ason
s:
•‘R
oll’
is a
n ab
stra
ctio
n be
caus
e it a
llow
s th
e pr
ogra
mm
er t
o fo
cus
on t
he r
esul
t of
a ro
ll, r
athe
r th
an o
n ho
w t
o im
plem
ent
the
roll
algo
rith
m (
1)
OR
•
‘Rol
l’ is
an
abst
ract
ion
beca
use
it is
a m
odel
/sim
ulat
ion/
repr
esen
tation
of
are
al/p
hysi
cal a
ctiv
ity/
action
(1)
(1)
18
19
20
22
23
24
25
26
27
28
29
30
31
32
Pap
er 2
Mar
k sc
hem
e
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
1(a
) Any
tw
o fr
om:
•D
ate/
tim
e of
last
ser
vice
(1)
.•
Tota
l run
ning
tim
e si
nce
last
ser
vice
(1)
•D
etai
ls o
f la
st s
ervi
ce (
1)•
Ove
rall
tota
l of
runn
ing
tim
e si
nce
car
boug
ht (
lifet
ime)
(1)
•C
ar n
umbe
r (1
)
•Acc
ept
mea
ning
ful
vari
able
nam
es t
ied
toth
e sc
enar
io,
e.g.
Car
Num
ber
(2)
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
1(b
) An
expr
essi
on t
hat
incl
udes
:
•C
alcu
lation
sho
win
g ag
e in
yea
rs (
1)•
30 m
in +
(10
min
* a
geIn
Year
s) (
1)
Exam
ple:
30 +
(10
* (
toda
yYea
r –
purc
hase
Year
))
(tod
ayYe
ar –
pur
chas
eYea
r) *
10
+ 3
0 30
min
+ (
10 m
in *
(to
dayY
ear
– pu
rcha
seYe
ar))
•U
nits
not
req
uire
d
(2)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
79
33
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
3(a
) O
ne m
ark
for
each
cor
rect
ans
wer
in t
he la
st c
olum
n:
Inp
ut
Ou
tpu
t d
isp
laye
d
nu
mA
du
lts
nu
mC
hil
dre
n
8 0
smal
l-gr
oup
disc
ount
(1)
2 2
fam
ily d
isco
unt
(1)
12
0 la
rge-
grou
p di
scou
nt (
1)
•In
thi
s or
der
only
inla
st c
olum
n
(3)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
81
34
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
3(b
) O
ne m
ark
for
each
cor
rect
row
:
Req
uir
emen
ts
Inp
ut
nu
mA
du
lts
nu
mC
hil
dre
n
A c
ondi
tion
gen
erat
ing
‘reg
ular
pri
cing
’ 1/
2/3/
4 0
Sm
alle
st g
roup
qua
lifyi
ng
for
‘fam
ily d
isco
unt’
2 1
(2)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
82
35
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
7
An
amen
ded
proc
edur
e sh
owin
g:
•Pa
ram
eter
inse
rted
(1)
•Le
ss t
han
(<)
test
usi
ng t
he n
ew p
aram
eter
(1)
•D
escr
iptive
var
iabl
e na
me
for
the
para
met
er r
elat
ive
to c
onte
xt (
1)
Exam
ple:
•D
o no
t pe
nalis
e sy
ntax
,if
disc
erni
ble
(3)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
89
36
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
10
(a)
A c
ompl
eted
flo
w c
hart
tha
t in
clud
es:
•C
orre
ct e
llips
e sy
mbo
l for
flo
w c
hart
sta
rt (
1)•
Cor
rect
wor
d ‘S
tart
’ or
‘Beg
in’ i
n sy
mbo
l (1)
•C
orre
ct d
iam
ond
sym
bol f
or d
ecis
ion
(1)
•C
orre
ct t
est
‘new
Pos
< o
ldPo
s’ in
sym
bol (
1)•
Cor
rect
labe
l ‘ye
s’ o
n bo
ttom
arr
ow (
1)•
Cor
rect
labe
l ‘no
’ on
righ
t ar
row
(1)
•Sym
bol a
nd c
onte
nts
are
awar
ded
inde
pend
ently
(6)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
91
37
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
10
(a)
(co
nti
nu
ed)
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
92
38
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
10
(b)
A f
low
char
t th
at in
clud
es t
he f
ollo
win
g as
pect
s:
Asp
ect
of
So
luti
on
M
arks
0
1
2
3
Fu
nct
ion
alit
y N
o aw
arda
ble
cont
ent
Ther
e ar
e si
gnifi
cant
err
ors
in lo
gic,
lead
ing
to a
n ov
eral
l so
lution
tha
t is
no
n-fu
nction
al
Ther
e ar
e m
inor
er
rors
in lo
gic,
le
adin
g to
an
over
all s
olut
ion
that
is n
ot
com
plet
ely
func
tion
al
Ther
e ar
e no
err
ors
in
logi
c,
lead
ing
to
an o
vera
ll so
lution
tha
t is
ful
ly
func
tion
al
Acc
ura
cy o
f N
ota
tio
n
No
awar
dabl
e co
nten
t
Not
atio
n fo
llow
s a
broa
dly
unre
cogn
isab
le
conv
ention
tha
t is
app
lied
inco
nsis
tent
ly,
alth
ough
asp
ects
of
it a
re
disc
erni
ble
Not
atio
n fo
llow
s a
reco
gnis
able
co
nven
tion
whi
ch
is b
road
ly
disc
erni
ble
but
is
appl
ied
inco
nsis
tent
ly
Not
atio
n fo
llow
s a
reco
gnis
able
co
nven
tion
an
d is
ap
plie
d co
nsis
tent
ly
thro
ugho
ut
Ther
e ar
e a
max
imum
of
3 m
arks
for
fun
ctio
nalit
y.
Ther
e ar
e a
max
imum
of
3 m
arks
for
acc
urac
y of
not
atio
n.
The
mar
ks f
or f
unct
iona
lity
and
accu
racy
are
aw
arde
d in
depe
nden
tly.
Exam
ple:
•D
isre
gard
use
of
‘sto
p’in
stea
d of
loop
as
show
n in
exam
ple
•D
o no
t pe
nalis
e us
e of
pla
inre
ctan
gle
inst
ead
ofin
put/
outp
ut f
low
cha
rtsy
mbo
l, if
disc
erni
ble
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
93
39
Que
stio
n N
umbe
r Ans
wer
Add
itio
nal G
uida
nce
Mar
k
10
(b)
(Co
nti
nu
ed)
(6)
No
Ye s
No
Ye s
Star
t
Ye s
No
Swit
ch
up?
Swit
ch
off?
Turn
rig
ht
lam
p of
f
Turn
rig
ht
lam
p on
Wai
t 0.
5
Ye s
No
Swit
ch
dow
n?
Swit
ch
off?
Turn
left
la
mp
off
Turn
left
la
mp
on
Wai
t 0.
5
Pearson Edexcel Level 1/Level 2 GCSE (9-1) in Computer Science – Sample assessment materials (SAMs) – Issue 2.0 – December 2015 © Pearson Education Limited 2015
94
40