0478_w15_qp_11
A paper of Computer Science, 0478
Questions:
13
Year:
2015
Paper:
1
Variant:
1
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1
Four hardware items are shown in the table below. For each hardware item: • name a suitable application • state how it is used in the application Give a different application in each case. Hardware item Application How the hardware item is used Barcode reader Microphone Touch screen Infrared sensor Describe two differences between Blu-ray discs and DVDs. Describe two differences between DVD-R and DVD-RAM.
3. Hardware  →  3.2. Input and output devices
4. Software  →  4.1. Types of software and interrupts
Open
3
Three statements about cookies are shown below. Study each statement. Tick (9) to show whether the statement is true or false. Statement True False Cookies can destroy or modify data in a computer without the user’s knowledge Cookies generate website pop-ups Cookies allow a website to detect whether a viewer has viewed specific web pages Two features of Von Neumann architecture are the use of registers and the use of buses. Give the names of two registers and two buses. Registers Buses
3. Hardware  →  3.1. Computer architecture
5. The internet and its uses  →  5.1. The internet and the world wide web
Open
4
Six computer terms and six descriptions are shown below. Draw a line to link each term to its appropriate description. Term Description Browser Signal sent to a processor which may cause a break in execution of the current routine, according to priorities HTML Company that provides individual’s access to the Internet and other services such as web hosting and emails Internet service provider Software application used to locate, retrieve and display content on the World Wide Web e.g. web pages, videos and other files Interrupt Hardware identification number that uniquely identifies each device on a network; it is manufactured into every network card and cannot be altered IP address Authoring language used to create documents on the World Wide Web; uses tags and attributes MAC address Location of a given computer/device on a network; can be a static or dynamic value
5. The internet and its uses  →  5.1. The internet and the world wide web
3. Hardware  →  3.4. Network hardware
Open
7
Describe what is meant by lossy and lossless compression when applied to files. Lossy Lossless Name and describe one type of file that uses lossy compression. Name Description A company advertises its backup memory device as having 500 GB of storage. A customer wishes to know how many 8 MB files could be stored on the device. The company claimed that up to 62 500 files (assuming each file is 8 MB) could be stored. The customer calculated that 64 000 files could be stored. Explain the difference between these two storage values. Show any calculations you use in your explanation.
1. Data representation  →  1.3. Data storage and compression
Open
9
Nicolae made the following statement: “data input is validated by typing it in twice” State why this statement is incorrect. Nicolae needs to send 30 photos to a friend and he chooses to send all 30 together as a single email attachment. Each photo is 1.8 MB in size, but the maximum possible attachment size is only 20 MB. State how Nicolae can solve this problem.
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
8. Programming  →  8.3. File handling
Open
10
Characters can be represented in a computer by a numerical code. The following list shows 16 characters with their numerical codes in denary: a = 97 e = 101 k = 107 t = 116 b = 98 g = 103 m = 109 u = 117 c = 99 h = 104 o = 111 w = 119 d = 100 i = 105 r = 114 . = 46 (code for the full stop) Web addresses can be written using hexadecimal rather than denary. Hexadecimal codes are preceded by a % sign. For example, the word “c a g e” is written as: either (in denary) or %63 %61 %67 %65 (in hexadecimal) Complete the conversion of the following web address into hexadecimal: w w w . c i e . o r g . u k %77 %77 %77 Complete the web address from the given hexadecimal codes: %77 %77 %77 %2E %72 %6F %63 %6B %69 %63 %74 %2E %63 %6F %6D W W W
1. Data representation  →  1.1. Number systems
5. The internet and its uses  →  5.1. The internet and the world wide web
Open
13
Identify which five computer terms are being described below. A system designed to prevent unauthorised access to or from a private network or intranet; it examines all data traffic to and from the network and filters out anything that does not meet certain criteria. Software that can be used on a trial basis before buying the full version; it often does not include all the features of the full version or has a time limit before it stops working. A protocol for transmitting private documents via the Internet; it uses two keys to encrypt the data – a public key and a private key. A standard adopted by the electronic music industry for controlling devices that produce music, such as synthesisers and sound cards. A device that allows audio signals to be converted into electrical signals which can be interpreted by a computer after being converted into digital signals.
5. The internet and its uses  →  5.3. Cyber security
3. Hardware  →  3.4. Network hardware
3. Hardware  →  3.1. Computer architecture
Open