w

w
w
.X
tr
me
eP
CAMBRIDGE INTERNATIONAL EXAMINATIONS

ap
er
GCE Ordinary Level

s.c
om
MARK SCHEME for the October/November 2012 series

7010 COMPUTER STUDIES

7010/13 Paper 1, maximum raw mark 100

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of
the examination. It shows the basis on which Examiners were instructed to award marks. It does not
indicate the details of the discussions that took place at an Examiners’ meeting before marking began,
which would have considered the acceptability of alternative answers.

Mark schemes should be read in conjunction with the question paper and the Principal Examiner
Report for Teachers.

Cambridge will not enter into discussions about these mark schemes.

Cambridge is publishing the mark schemes for the October/November 2012 series for most IGCSE,
GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level
components.
 Page 2 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

1 1 mark for each benefit and 1 mark for each drawback

Stand alone computer:
benefits:
– sound
– animation/graphics
– no need for Internet access
– more secure (less likely to be hacked)

drawbacks:
– not up-to-date
– expensive multimedia equipment
– need to take multimedia presentation file(s) and back-up(s)

Internet website:
benefits:
– use of pop ups/pop-unders (to advertise on other websites)
– ability to use hyperlinks
– available world wide both ways

drawbacks:
– expensive to maintain a website
– Internet security issues (hacking into (company) website; phishing; pharming)
– poor Internet access can make video/sound unacceptable [4]

2 Any three benefits from:

– several programmers can work on same software package
– it is easier to debug modules than a whole program
– it is easier to test modules than test the whole program
– can use modules from a bank of routines (saving time and money)
– enable large tasks to be broken down into more manageable smaller tasks [3]

© Cambridge International Examinations 2012

 Page 3 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

3 1 mark per correct arrow connecting left with right

use of synthesisers to
combine simple wave animation
forms to produce more
complex sounds

use of compression
software and echo
cancellation software to MP3
allow effective
communications

use of avatars in the

sequence of images one music generation
after the other to produce
special effects

audio compression
technology to compress
large files into smaller files
simulation
which can be played back
without loss of quality

imitation of a real event

using a set of
mathematical formulas to video-conferencing
create a model
[5]

4 (a) Any four from:

– use of video-conferencing/webcams
– use of emails (and attachments)
– use of VoIP systems
– instant messaging
– chat rooms
– social networking sites
– bulletin boards
– blogs
– (on-line) gaming with others [4]

© Cambridge International Examinations 2012

 Page 4 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

(b) Any two from:

– easier access to inappropriate material
– poor internet connection can cause delays/lag/drop outs
– more open to people who may wish to harm you
– security issues/viruses
– too much time spent on the computer/health and safety issues [2]

(c) Any four from (for example):

– GPS
– MP3/music files
– game playing
– camera/video
– calendar function
– calculator/utility functions
– Bluetooth
– SMS/MMS/text messaging [4]

5 (a) – format check

– length check [2]

(b) name: reason:

– range check – mixture of letters & digits
– character/type check – mixture of letters & digits
– check digit – it contains letters
– existency check – does not check format/length
– cross field check – only 1 field present [2]

6 1 mark per correct stage

Description of stage Order

of
stage

The message travels over the Internet and arrives at recipient’s ISP 5
mail server

Message sent to sender’s ISP mail server 2

Recipient logs on to read his messages 7

The sender composes his message and activates the send 1

command

Message held in recipient’s electronic mail box 6

ISP mail server examines address associated with message 3

Message retrieved and sent to recipient’s computer to be opened 8

and read

Sender’s ISP mail server decides how to route the message 4

[7]

© Cambridge International Examinations 2012

 Page 5 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

7 (a) use of chip and PIN technology

– introduction of EMV (international standard for smart card payments)
– tighter checks on usage (automated phone checks/card readers/the use of ‘verisafe’
concept) [1]

(b) 1 mark for name and 1 mark for corresponding description

phishing: – fraudster sends out email

– user thinks email is legitimate
– clicks on link and is taken to bogus website

pharming:
– malicious code installed on user’s computer or server
– code mis-directs user to fraudulent website without their knowledge

keylogging/spyware:
– program installed on a computer tp monitor all key presses and sends data
back to writer of spyware

or spyware:
– scan files on hard drive
– ‘snoop’ applications

hacking: – unauthorised access to computer system

– often to do malicious harm (e.g delete files)

shoulder surfing:
– the act of watching a person key in secure data (e.g. PIN, password, etc)
– stealing security data by using binoculars, CCTV near ATMs etc. to watch key
presses etc.

war driving
– locating a wireless network by touring around an area
– requires a laptop [6]

8 (a) Any two from:

– can’t pick up semantics (e.g. incorrect use of the words weather/whether)
– could be set to wrong version (e.g. US/UK/other English etc.) [2]

(b) Any one from:

- simple translators do literal translations/use incorrect syntax
- can’t pick up the nuances/colloquial words in a language
- problems with grammar
- no equivalent words in other language [1]

© Cambridge International Examinations 2012

 Page 6 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

(c) Any two from:

e.g.
- change font size/type
- change font colour/type
- use of columns
- search and replace words [2]
9

C H T1 T2 T3 number OUTPUT

1 0 0 0 0 1500

2 1500 1 1000

3 2 100

4 1 10

5 1 999

6 2 99

7 2 2000

8 2000 3 5

9 3 -3

10 4 0

11 5

5, 2, 3, 2000
1 mark 1 mark 1 mark 1 mark 1 mark < - - - - - 1 mark - - - - - > [6]

10 1 mark for device + 1 mark for reason

backing memory device:
– memory stick/flash memory – portable, very small device/large memory
– CD/DVD-RW drive – common media/large memory/portable
– (external) hard disk drive – very large memory/portable
– solid state memory – no moving parts/lightweight/portable
– floppy disc drive – portable

printer type:
– dot matrix printer – can operate on dirty/damp atmospheres
– 3D printer – can produce working prototypes
– laser printer – high quality, fast output for multiple copies
– inkjet printer – high quality, low volume output
– (graph) plotter – producing very large, accurate drawings

© Cambridge International Examinations 2012

 Page 7 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

input device (for e.g.):

– keyboard – for keying in data into W/P, S/sheet, etc.
– light pen – used with CAD packages
– mouse/trackerball – pointing device for selecting options
– touch screen – easy to use, suitable when limiting options
– joystick – easier to control pointer
– specialist CAD devices – specific to engineering company
– microphone – easier for disabled people to enter data
– webcam – video conferencing [6]

11 (a) 15 records [1]

(b) FR, QE, NO, TI, MA

(-1 mark for each error or omission) [2]

(c) (Gross Tonnage > 80 000) OR (Country of Registration = “UK”)

< - - - - - - - 1mark - - - - - - > < - - - - - - - - - - - 1 mark - - - - - - - - - - >

or

(Country of Registration = “UK”) OR (Gross Tonnage > 80 000)

< - - - - - - - - - 1mark - - - - - - - - > < - - - - - - - - - 1 mark - - - - - - - -> [2]

12 (a) (i) (=) (A3 * A3 + B3 * B3) – (C3 * C3) OR

(=) (A3 ^ 2 + B3 ^ 2) – (C3 ^ 2) [1]

(ii) = IF (D3 = 0, “Yes”, “No”)

Quotes essential [1]

(iii) Any two from:

– draw graphs (e.g. line graph)
– make use of graph to find c
– insert formula to calculate c values/
( a2 + b2 ) gives c values
– add another column [2]

(b) Any three from (for e.g.):

– can draw graphs (e.g. line graph)
– cell merging
– cell formatting (e.g. date, numerical, text, string, etc.)
– cell locking
– cut/copy/paste/replicate formulae
– automatic recalculation
– goal seek [3]

© Cambridge International Examinations 2012

 Page 8 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

13 (a) - lift 7
- presently on 56th floor
- going down [2]

(b)

0 1 1 0 1 0 1 1 0 1
< - - - - - - - 1 mark - - - - - - > < - - - - - - - - - - 1 mark - - - - - - - - > [2]

(c) (i) Any two from:

– is lift in service?
– is a lift already on the 14th floor?
– is the ultimate destination of a lift in motion the 14th floor?
– which lift is nearest 14th floor?
– which lifts are going up?
– which floor is the lift on?
– which lifts are below 14th floor? [2]

(ii) D [1]

(d) Any pair of points from:

– lift is on floor 000 } 1 mark
– going down } 1 mark

– lift is on floor 60 } 1 mark

– going up } 1 mark

– floor number > 60 } 1 mark

– going up/down } 1 mark

– lift out of commission } 1 mark

– going up/down } 1 mark [2]

© Cambridge International Examinations 2012

 Page 9 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

14 (a)
START

INPUT reading from

temperature sensor

(1 mark)
1

Yes
6/7 11/10
pairs
No MUST
match up:

Yes 6 with 11
7/6 10/11 and
(1 mark) 7 with 10
No

3
(1 mark)

8/9 4/5 (1 mark)

pairs
Yes No MUST
match up:

4 with 8
9/8 5/4 (1 mark)
and

5 with 9
Yes No

[5]

© Cambridge International Examinations 2012

Page 10 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

(b)

input readings from

the humidity sensors
1 mark

convert humidity sensor readings into 1 mark

digital signals using an ADC

send signal to (open Yes is humidity

valve and) spray reading 1 mark for both correct
water into the air < 40?

No

send signal (to is humidity

Yes
motor) to open the reading 1 mark for both correct
windows > 90?

No

[4]

© Cambridge International Examinations 2012

 Page 11 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

15 (a)
A B C X

0 0 0 1
1 mark
0 0 1 0

0 1 0 1
1 mark
0 1 1 0

1 0 0 1
1 mark
1 0 1 0

1 1 0 1
1 mark
1 1 1 1
[4]

(b) 1 mark for gate name + 1 mark for each pair of outputs in truth table.

NAND gate NOR gate

A B X A B X

0 0 1 0 0 1

0 1 1 0 1 0

1 0 1 1 0 0

1 1 0 1 1 0
[3]

© Cambridge International Examinations 2012

 Page 12 Mark Scheme Syllabus Paper
GCE O LEVEL – October/November 2012 7010 13

16 sample program:

x = 0: tbun = 0: tcoffee = 0: tcake = 0: tsand = 0: tdessert =0 1 mark

repeat 1 mark
input item 1 mark
if item = “bun” then tbun = tbun + 0.5
else if item = “coffee” then tcoffee = tcoffee + 1.20
else if item = “cake” then tcake = tcake + 1.50 2 marks
else if item = “sandwich” then tsand = tsand + 2.10
else if item = “dessert” then tdessert = tdessert + 4.00
else print “error”
until item = “end”
if tbun > x then x = tbun
if tcoffee > x then x = tcoffee
if tcake > x then x = tcake 2 marks
if tsand > x then x = tsand
if tdessert > x then x = tdessert
total = tbun + tcoffee + tcake + tsand + tdessert 1 mark
print total, x 1 mark

marking points:
– complete initialization
– correct loop structure (could be while – end while or do – until loop.)
– input item INSIDE the loop
– check on which item has been input
– *summation of value of each item input
– check if each item total is the largest value
– variable (e.g. x) takes on the highest total value
– total value of ALL five totals
– correct output OUTSIDE the loop [6]

© Cambridge International Examinations 2012