2210_s16_qp_12
A paper of Computer Science, 2210
Questions:
11
Year:
2016
Paper:
1
Variant:
2
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3
Convert the following hexadecimal number into 12-bit binary: 4 A F The 2016 Olympic Games will be held in Rio de Janeiro. A timer that counts down to the opening of the Games is shown on a microprocessor-controlled display. The number of hours, minutes and seconds until the Games open are held in three 8-bit registers. The present register values are: 105 hours 32 minutes 20 seconds The timer will count down in seconds. Show the values in each 8-bit register 30 seconds after the time shown above: hours minutes seconds Write the hexadecimal value of the minutes register from part .
1. Data representation  →  1.1. Number systems
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5
Six descriptions and six devices are shown below. Draw a line to link each description to the correct device. Allows a user to write on a surface using a pen; text and drawings are then captured electronically and stored for later use. Interactive whiteboard Description Converts sound into an electrical signal/voltage. Uses thermal bubble and piezoelectric technology to produce a hard copy. Uses a bright white light source and micro mirrors (on a chip) to produce an image to be shone onto a wall or screen. Converts a hard copy document into an electronic form to be stored as a file on a computer. Uses negatively charged images on a rotating drum and positively charged toner to output a hard copy. Inkjet printer Digital Light Projector Laser printer Microphone Scanner (2D) Device
3. Hardware  →  3.2. Input and output devices
Open
6
Three descriptions of data transmission are given below. Tick (✓) the appropriate box in each table to show the: • type of transmission • method of transmission Description 1: Data is transmitted several bits at a time down several wires in both directions simultaneously. Type Tick (✓) Method Tick (✓) simplex serial half-duplex parallel full-duplex Description 2: Data is transmitted in one direction only, one bit at a time, down a single wire. Type Tick (✓) Method Tick (✓) simplex serial half-duplex parallel full-duplex Description 3: Data is transmitted one bit at a time down a single wire; the data is transmitted in both directions but not at the same time. Type Tick (✓) Method Tick (✓) simplex serial half-duplex parallel full-duplex Give two reasons why serial transmission, rather than parallel transmission, is used to connect devices to a computer.
2. Data transmission  →  2.1. Types and methods of data transmission
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8
Five statements and three types of software are shown below. Draw lines to connect each statement with the correct type of software. Free software Freeware Shareware Type of software Users have the freedom to pass on the software to friends and family as they wish. Users can download this software free of charge, but they cannot modify the source code in any way. Users are allowed to try out the software for a trial period only before being charged. Users can study the software source code and modify it, where necessary, to meet their own needs, without breaking copyright laws. Users can obtain a free trial version of the software, but this often does not contain all the features of the full version. Statement Describe three ethical issues that should be considered when using computers. Security of data is very important. Three security issues are viruses, pharming and spyware. Explain what is meant by each issue. Viruses: Pharming: Spyware: Describe three tasks carried out by a firewall.
5. The internet and its uses  →  5.3. Cyber security
4. Software  →  4.1. Types of software and interrupts
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9
In the following barcode, each binary number is made up of seven bars. Each bar is black or grey. A black bar is interpreted as a “1” and a grey bar is interpreted as a “0”. Write the binary numbers that would be produced from this barcode: %LQDU\QXPEHU$ %LQDU\QXPEHU% Binary number A: Binary number B: This barcode system uses odd parity. Write the parity bit for each of the binary numbers in part : Parity bit Binary number A: Binary number B:
1. Data representation  →  1.1. Number systems
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10
There are six descriptions in the table below. Complete the table below by writing the correct storage device or media in the box next to each description. Description Storage device or media Non-volatile memory that can only be read from and not written to. Optical storage media that allows very high storage capacity by using blue/violet laser technology. Volatile memory that stores data, programs and the parts of the operating system that are currently in use. Optical storage media that uses a single spiral track and uses dual layer technology, allowing high data storage capacity. Device that stores data by controlling the movement of electrons within a microchip; there are no moving parts. Optical storage media that uses concentric tracks allowing writing and reading to take place at the same time.
3. Hardware  →  3.3. Data storage
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