O-LevelComputer ScienceHardware2210/12 · Oct/Nov 2022 · Q127 Marks

A bus station has a ticket machine. A customer can use the ticket machine to select and pay for their ticket. One input device built into the ticket machine is a touch screen.

(a)Identify two other input devices that could be built into the ticket machine. Input device 1 Input device 2[2]
(b)The ticket machine has a help icon that a user can touch to contact customer support. The ticket machine has an output device that allows the user to hear the customer support person. Identify an output device that would be used for this purpose.[1]
(c)(i)The touch screen for the ticket machine uses resistive technology. Describe how resistive touch screen technology operates to recognise a user's touch.[4]
(c)(ii)Give two benefits of using resistive touch screen technology for the ticket machine. Benefit 1 Benefit 2[2]
(c)(iii)Give two drawbacks of using resistive touch screen technology for the ticket machine. Drawback 1 Drawback 2[2]
(c)(iv)Identify one other touch screen technology that could have been used.[1]
(d)The computer in the ticket machine uses the stored program concept. Describe the stored program concept.[2]
(e)The computer in the ticket machine has an operating system. One function of the operating system is to provide an interface for the user. State three other functions of the operating system. Function 1 Function 2 Function 3[3]
(f)(i)The computer uses 12-bit binary registers to store data whilst it is being processed. Customers are given a denary ticket number. Give the 12-bit binary value that is stored in the register for each denary ticket number. 100 235 301 Working space[3]
(f)(ii)Show the denary ticket number that would be given to the customer for each 12-bit binary value. 000000010110 000001110111 001101011001 Working space[3]
(f)(iii)Binary values can also be represented as hexadecimal values. Show the hexadecimal value that represents each of the two 12-bit binary values. 000010010101 101011010001 Working space[4]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

[2] 1(a) Any two from: Keyboard // Trackpad // Trackball // Microphone // Keypad // Sensor // Button // Barcode/QR scanner/reader // Webcam/digital camera
[1] 1(b) Any one from: Speaker // Headphones
[4] 1(c)(i) Any four from: The screen is made up of (two) layers/multiple layers // The user pushes the top layer into the bottom layer // The user pushes the layers together // The layers create a circuit (when pushed together) // causing electricity to flow // allowing the co-ordinates/location of the users touch to be calculated
[2] 1(c)(ii) Any two from: Cheap to manufacture/buy // Can still be used whilst wearing gloves // Waterproof // Can be used in bad weather // Does not easily shatter // Low power consumption // (Can) support multitouch
[2] 1(c)(iii) Any two from: Does not (normally) support multitouch // Screen visibility can be poor in sunlight // Longevity issues // (Normally) lower resolution // Not very sensitive to touch // Lower response time (than capacitive) // Prone to scratches
[1] 1(c)(iv) Any one from: Capacitive // Infrared
[2] 1(d) Any two from: Data and instructions are stored in the same memory // and can only be fetched one at a time
[3] 1(e) Any three from: Multitasking // Multiprogramming // Input and output control // Running software // Memory management // Processor management // File management // Handling interrupts // Providing security // Managing user accounts // Batch / real-time processing
[3] 1(f)(i) 000001100100 // 000011101011 // 000100101101
[3] 1(f)(ii) 22 // 119 // 857
[4] 1(f)(iii) One mark for two correct characters in the correct place, two marks for three // 095 // AD1