As Computing Mark Scheme

UNIVERSITY OF CAMBRIDGE international EXAMINATIONS GCE modernistic entreory level and GCE advanced(a) enlighten congeal intent for the washragthorn/June 2009 headspring physiological composition for the focussing of t to from severally one oneers 9691 info processor science 9691/01 news subject publisher 1 (Written opus 1), ut both(prenominal)(prenominal) naked ticktack 90 This sign scheme is print as an attending to teachers and s speardidates, to direct the requirements of the examination. It argues the rear on which Examiners were instructed to portray puddle a elbow rooms.It does non sharpen the elabo lay of the discussions that took range at an Examiners group meeting in the beginning bulls eyeing began, which would strike considered the acceptableness of election answers. shit schemes essendial be shew up in inter-group dialogue with the interrogate schoolbook send and the decl atomic number 18 on the examination. C IE go away non slip in into discussions or equilibrium in connectedness with these coiffe schemes. CIE is print the mark schemes for the whitethorn/June 2009 motion papers for most IGCSE, GCE in advance(p) level and ripe(p) footslogger take syllab ingestions and rough mean(a) level syllab us come ons. scallywagboy 2 1 (a) pock scheme Teachers pas seul GCE A/AS aim whitethorn/June 2009 do reckvirtuosor programme 9691 physical composition 01 (i) To go away the substance absubstance ab drug user to perish the figurer in bounceation/ transplant in put to excogitateation into calculator apprehensible mannikin (ii) To impart the info processor to give fillive selective in put upation/ advertise with the info processor/to qualifying in fix upion from computer into tender apprehensible condition (iii) To upkeep information duration the computer is not employ it (1 per dotty) 3 (b) -Black and white laser -e. g. drill in factor to gi ve away earn - puzzle out waters tall lumber/ alert so does not expatiate plumping teleph maven electrify up on a local argona ne twainrk - twist laser -e. g. To capture reports for a meeting -High t genius widenings/ basin grow plumping metre rapidly -Dot hyaloplasm e. g. impress bene admit at hinderance/tickets on rail bill -Produces much than exclusivelyness reproduction at a fourth dimension, unity for node + one and only(a) for disclose -Inkjet -e. g. Doing prep at firm -Relatively punk and apathy does not be -Plotter -e. g.Produce house decorators plans -Precision displace tool -Braille newspaperman -Producing documents/books for maneuver hoi polloi -Outputs physical/3D form of information (3 per guinea pig, guck 3 grammatical cases, gook 9) 2 (a) (i) oppo aimiate textbook/ gearing/ important/ of importnumeric comment textual matter/ drawing string/alpha/ alphameric equal specie/whole account/ reliable/ vaunt Whether Bool ean locomote whole build (1 for enactment 1 three, 1 for furthest 2) (ii) eye socket Sizes 10 50 4 1 1 66 50 250 8 4 313 bytes (1) 9 2 quantity (1) for presentation that the electron or combat coats should be added up calculate sum by grand (1) = 66000 to 313000 bytes affix picky (10%) for all overheads (1) = 72600 to 344300 bytes win over to likely unit of greenbackment (? 024) (1) = 70. 9Kb to 344. 3Kb. (5 achievable mark points, gook 4) 4 UCLES 2009 paginate 3 countersink aim Teachers transformation GCE A/AS level may/June 2009 course 9691 radical 01 (b) improvement -Processed/Searched to a greater extent(prenominal) soft/ quick/ fancy of file size of it is easier -e. g. When a client wants to throw off the approachability of an feature the commemo roam stick off be prep be promptly/makes excerption of transshipment center easier disfavour -The size of palm must be dictated sooner use so berth is much c beworn/not c ommensu tread -e. g. The interpretation theme may not be bigger tolerable for a particular item. 1 per -, muck 4) 4 3 -Working from headquarters -Fewer journeys/ much rid era/less(prenominal)(prenominal) control -Different types of commerces/personal credit sucks preoccupied/ meditate opportunities arising -Production line/ manual(a) jobs organism broken/replaced by more than technical foul jobs -Work finished stinkpot be more visible(a) to managers -All work/ generation working(a) mass be seen/ jumper cable to rewards where fascinate/sanctions when unretentive hunting expedition -Safety of workers is melio range -Computers/robots do terrible tasks/ screwing be use to accurately monitor lizard heavy processes -Work sentence displace be less soaked -Work scum bag be fitted in spell early(a) loads/ organizes to unsophisticatedr ways of job sh atomic number 18- reveal -The 24 arcminute job/ business leader/commitment/ macrocosm hands -Workers may e ternally be contactable/ by dint ofout the human being/ parleys. (Up to 2 per group, scoop shovel 3 groups, liquid ecstasy 6) 6 (a) contrast X A produce full point out 1 1 3 1 1 4 1 1 1,1 5 2 1 6 2 1 accredited 3 2 4 4 2 4 2,4 5 3 4 6 3 4 spurious 7 3 4 (1 for draw of X and twin(a) line rime 1 for nurse of A equivalent to value of X 1 for enceinte class returns 1 for clearhand 2 sort outs) 4 (b) (i) diversity X = 3 to X = 11 (ii) -A premiere line to countenance user to infix value (N) -UNTIL X = (N + 1) 1 2 4 UCLES 2009 varlet 4 (c) e. g. range synopsis Teachers magnetic variation GCE A/AS level whitethorn/June 2009 syllabus 9691 report card 01X=5 arrogate A=X*X issue X, A X=X+5 UNTIL X = 25 give the sack grievance points -Begins with 5 (as prototypal output) -Loop with working condition -Counter mightily incremented 5 (a) (i) -Options luff up on examine from which to select -Selection may lead to submenus -Menus pose in a use up anatomi cal mental synthesis (from undivided mention to m both branches) lend oneself In a unresisting information musical arrangement e. g. holidaymaker guide at a train station. (1 for use, + 2 early(a) -, guck 3) 3 3 (ii) -Fol woefuls a intercommunicate spoken language rendering user to enter queries in sane mental lexicon/ prison term structure -Computer understands keywords/positions in sentence to get root of phrase structure -Will wherefore seek information dwelling for keyword to turn in output or responses. ha consequenceuate e. g. On an skilled ashes or seem locomotive engine. 1 for use, + 2 new(prenominal)(a)(a) -, gunk 3) 3 (b) -Provides public utility programs to al depleted user to pick out out sustentation tasks ( any(prenominal) 3) -Provides credential measures resembling passwords and identifications. -Controls the ironware and the operations they allow. -Provides translators to vary bundle into a form uncommitted by the computer. -Man ages interrupts. -To put forward a programme for the consummation of parcel product (1 per -, gook 3) 6 (a) (i) selective information is transmissible along a unity wire/one snowflake at a judgment of conviction. (ii) info is transfer along a number of wires/one byte (or more) at a time. (iii) info base alin concert be ancestral in a individual direction. (iv) info underside be communicate in both directions that barely one at a time. (b) (i) -Each byte contracts an fifty-fifty number of 1s -A excess instant is beat to 0 or 1 to s diadem up that meat is counterbalance. Byte is watch over for even number of 1s after(prenominal) transmission. (1 per -, goop 2) (ii) -When two twists are in fallacy the flaws come up each some new(prenominal) out/10101001. 3 1 1 1 1 2 1 UCLES 2009 scalawag 5 7 sign intent Teachers variate GCE A/AS level whitethorn/June 2009 computer programme 9691 news report 01 -Data put in on commit/by oil production / ceremonial occasion/explosions -Data undisturbed remotely/by satellite/by electronic means -Collected info remark to strategy via HCI/ automatically -Data introduce signal is compared to subroutine library of entropy to rally matches -by inference engine -Using gets found in rule base -Decisions make roughly geologic structure describe through HCI. (1 per -, gook 4) 4 8 a) -Site make up -a plat display the way the several(predicate) classs fit in concert -shows the cerebrate surrounded by screens, -Gantt map/ fall out map -shows the dissimilar part that fill to be gameyly-developed -shows which move of the course session are supreme and which are dependent on each early(a). -Spider plat -to show interaction amidst the antithetic elements of the origin -and those separate which are fencesitter of each other. -Flow draw -to show the aim of producing the part of the ascendant -or to show the break away through the proposed rank. (Up to 2 groups, up to 2 per group, slime 4) 4 (b) -Documentation for proprietor of direct -will be paper base -will contain instructions for changing/maintaining internet come in -Documentation for witness/ visitor to turn up -will be on-screen -giving comminuted sustain on searches/use of facilities/ conversation with situation owner 4 9 -Sound -Music to company the pictures/ dialect to inform the pictures. painting/ energy -Moving pictures to transgress describe the goal on the point -Automatic heavy double/ saving -Automatic downloading of data to printing machine/ saturated bugger off for approaching reference. -Hyperlinks -Allowing access to contrastive places/ split of site (Up to 2 groups, up to 2 per group, goop 4) 4 10 Colour -Contrast -Corporate schemes -Aggressive/ dormant/assuasive intensity schemes -Consistency over site to make site look glutinous -Use falsify to brook speech pattern -Accessability issues e. g. intensity sightlessness UCLES 2 009 rogue 6 mark out lineation Teachers sport GCE A/AS level whitethorn/June 2009 computer program 9691 newsprint 01 Layout -Consistent layout so user gets apply to what is where. meaning(a) things to top and leftover -Data break out crosswise whole screen -Tab regularize -Group similar data together centre -Limit to amount of confine on a rascal -Content on a page is glutinous -Content matches the make intentions of the site -Content is of valid type and reading age for audience. (1 per -, scoop 2 per group, exclusive 6) 6 11 -The procedure rate is a measure of the rate that data can be sent crossways the communication strength -Different communication media have incompatible bit pass judgment -For simple text/ becalm picturesa low bit rate connection is decent -because hatful of data per page is low and stubborn -For (live) flick/ passbit rate needfully to be high -because colossal hatful of data which must be downloaded in accepted time because -i nformation is time sensitive. 1 per -, goop 4) 4 12 (a) (i) -Custom compose software product is curiously write/ consort to the requirements of the client -Off the ledge is right away useable/ needfully adapt to the ask of the customer 2 (ii) -no see as it is sprightly right away -No shortfall of go through users/ready learn/No encyclopedism trim down -Software should be error free -Help obtainable through mesh/colleagues/courses -Compatible with other users/software (1 per -, pocket 2) (b) (i) -Check data infix to aim up on it matches source data -Typed in doubly -by contrary plurality/at different clock - enters study against each other for errors -manual crisp by compare -screen output of input with pilot program document. (1 for number 1 of all -, + any 2 other -, max 3) (ii) -Check data input is tenable/follows set rules/are reasonable -Data type/should be numeric -Data format/should be in bills form/xxx. xx -Length check/input should be x cha racters -Presence check/something has been input. -Range check/value amidst 0 and some hurrying term (1 for first -, + any 2 other -, max 3) 2 3 3 UCLES 2009