EDEXCEL GCSE Paper 1 (2017)  exam paper can be downloaded here


EDEXCEL GCSE Paper 1 (2017) mark scheme can be downloaded here
1Ai Answer
0000 1100

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1aii answer
5

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1b answer


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1ci answer


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1cii answer


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1ciii answer
4

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1civ answer
fibre='wool'

Allow ‘IS’ for ‘=’
Allow ‘==’ for ‘=’​

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1di answer


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1dii answer
(When reaching the end of the alphabet), the algorithm does not go back to the beginning of the alphabet

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1ei answer
Any two of:
 An automated system can run 24/7 (1)
 An automated system n automated system does not need to be paiddoes not need to be paid (1)
 Shouldn’t make mistakes / more reliable / safer (1)
 Cheaper than employing people (1)
 Leaves road workers free to do other tasks (1)​

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1eii answer
 Naming a suitable sensing device for this situation (1) (including pressure, light, ultrasonic, distance, motion)
 Concept of detection / input (1)
 Concept of the microprocessor having a process / program (1)
 Microprocessor generating an output / signal change (1)​

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2ai answer
Any one of:

 Predict weather patterns/storms/hurricanes/etc.
 Investigate scientific hypotheses/climate change/etc.(1)
 Run experiments because they can’t change the weather for real (1)​

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2aii answer
Any one of:

 rainfall amounts
 hours of sunshine
 wind direction/speed
 temperatures
 humidity
 at mospheric pressure (air density)
 elevation (above sea level)​

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2aiii answer
Any two of:

 Very large amounts of data are collected (1)
 Algorithms are mathematically complex/intensive (1)
 Algorithms may need Algorithms may need more more CPU cycles as the amount of data grows (1)
 To be of value, the results must calculated as quickly possible (1)​

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2bi answer


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2bii answer
Q = R AND L AND W​

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2c answer
Any 2 of:
 Chemical on surface of the disc (1)
 The magnetic state (of the chemical) represents data (1)
 The heads  move in and out (1)
 Heads change/detect the (magnetic) state (1)​

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2di answer
Any 2 of:

 Indentation (1) 
 Meaningful/sensible variable names
 Comments (1)
 White space/spaces between sections of code (1) ​


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2dii answer
Either 16 or 17 (1) ​

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2diii answer
Either 20 - 24 or 20 only (1)​


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2e answer
Any 2 of:
 Code is easier to read (1)
 Code only needs to be written once / reduces the need to copy/paste code multiple times / shortens the code (1)
 Code only needs to be debugged once / easier to find errors (1)
 Reduces the size of the executable file (1)
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2f answer
  • A global variable can be accessed from anywhere in the whole program (1), local variable can only be accessed from the subprogram/block of code in the which it is declared (1)
  • Globals are persistent while program is running (1), locals are created/destroyed with each call of the subprogram (1)
  • Globals can only have one instance (1), locals can have instance for each (running) subprogram (1)


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3a answer
 ASCII ASCII ASCII / American Standard Code for Information Interchange
 UTF-8 (1)​

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3B answer
b3r2y3r2
3b2r3y2r
One incorrect character or digit is maximum 1 mark
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3c answer
 Input value taken in trapezoid box (1)
 Two decision boxes, one for red and one for blue; contents must be answerable by yes/no (1)
 Two process boxes, which follow the decision box and have an indication of an increment to the vote count (1)
 An indication of some type of error output, like printing or file (1)​

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3d answer
 Four or five numbers from the nodes (1)
 (40, 20) or (20) as first item (1)
 (45, 10) in the correct sequence (1)
 30 as last number (1)​

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3ei answer
D (Label D)

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3eii answer
any value in the range of 13.7 to 14.0

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3eiii answer
Analogue signals are all continuously variable / change all the time (1)
Digital signals have only two states (0 or 1, high or low, on or off) (1) Digital signals represent analogue signals by sampling (1)

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3fi answer
  • One mark for multiplying by 1000
  • One mark for multiplying 44.1 x 16 x 2 

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3fii answer
  • One mark for (3 x 60 x128000)
  • One mark for dividing by (8 x 1024 x 1024) 

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4a answer
User support available:
  • Open source software is supported usually by a group of volunteers on on-line forums (1)
  • Experienced programmers like these probably don’t need much support (1)
 
Ability to customise the program solution
  • Open source code is available to be changed in any way to suit the charities (1)
Changed code can be redistributed by charities because it is open source (1)​

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4bi answer
Any 1 of:

  • Describes/defines the layout/formatting of (the content of) a web/HTML page (1)
Assigns properties to HTML tags (1) tyle='letter-spacing:-.1pt'> (1)
 
4bii answer
 B ({ font-weight:bold; text-align:center; })


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4biii answer
 C (It takes the user to a different web page on this website. )

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4c answer
Any two of:
 
  • To share data (documents, pictures, files, chat, etc.)
  • To share hardware/peripherals (printers, scanners)
  • To share an Internet connection (including services WWW, email, FTP, etc.)
  • To distribute data or workload across different computers
  • To centralise support and maintenance of software
  • To allow remote access to machines
  • To allow collaboration / working together
To allow communication between users / email / instant messaging / VOIP​

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4d answer
  • Wireless (Wi-Fi, Li-Fi, IR, IrDA, microwave, Bluetooth)
  • Copper cable (accept copper alone)
  • Fibre optic cable (accept fibre alone)

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4e answer
One mark for a description:
  • A cookie is a piece of text or a small file (stored on a user’s hard disc by a web server) (1)
  • A cookie records/tracks/monitors data/activities (1)
 
AND one mark for any of:
  • Which can be retrieved on a following visit to the web site (1)
  • Which uniquely identifies the visitor to the web site (1)
Any example of how a web site might use the information identified via the cookie, such as provide customised experience (1), target advertisement (1)​

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4f answer
•    A checksum number is calculated at the sending end (1) (based on the content of the data)
•    A checksum is appended to the packet (1)
•    The checksum is recalculated at the receiving end (1)
•    If the new checksum and the one in the packet do not match (1), there is an error

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4gi answer
•    A MAC address is a unique identifier for a device (1), assigned by the manufacturer (when the device is made) (1), and cannot be changed (1).​

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4gii answer
•    Domain name system / Domain name server / DNS

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