Form 3. Half Yearly Exam Revision
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1 Form 3 Half Yearly Exam Revision
2 What is the difference between data and information?
3 What is the difference between data and information? Data is the representation of information Information is the things that we know
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5 Which of the following is raw data and which is information? Average test score is 67% and your mark is below average AB
6 Which of the following is raw data and which is information? Information Average test score is 67% and your mark is below average Raw data AB
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8 What is an electronic machine?
9 What is an electronic machine? A machine that uses solid-state electronic components or chips and does not have moving parts
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11 Which of the following are electronic machines? Power driller Mobile phone Windmill Pocket calculator
12 Which of the following are electronic machines? Power driller Mobile phone Windmill Pocket calculator
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14 Suggest 2 advantages of computerising a system
15 Suggest 2 advantages of computerising a system Storage & processing of large volumes of data computers are able to do this more efficiently and faster than humans working on the same data. Accuracy computers give very precise results to mathematical instructions. Cost Effectiveness Very often doing a job with a computer is, in the long run, less expensive to an organisation than paying people to do it. Consistency and reliability computers always give the same results to the same instructions and their performance remains consistent even when handling repetitive jobs. Humans often grow tired and lose concentration especially on repetitive jobs.
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17 Suggest 2 disadvantages of computerising a system
18 Suggest 2 disadvantages of computerising a system Health risks: health problems, particularly Repetitive Strain Injury (RSI), are possible if one regularly uses a computer for long hours. Lack of Safety and Security: Accidental mistakes as well as the risk of hacking and getting a virus put our data at risk. Fear and resentment: People may worry about the impact of new computerized systems on their jobs and they may not cooperate when the system is introduced. Planning and consultation before introducing computers in an organization can reduce this resentment Dependency: an organisation may grow dependent on computers, so when the system fails, the operation of the company stops or slows down.
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20 Give the 7 basic functions of a computer system
21 Give the 7 basic functions of a computer system Input Output Process Send Receive Store Retrieve
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23 At which jobs are computers better suited than humans? At repetitive jobs: eg. Assembly line in a factory At jobs requiring accuracy and speed but not creativity At jobs requiring creativity At jobs requiring judgment (eg. Judgement of artistic merit)
24 At which jobs are computers better suited than humans? At repetitive jobs: eg. Assembly line in a factory At jobs requiring accuracy and speed but not creativity At jobs requiring creativity At jobs requiring judgment (e.g. Judgement of artistic merit)
25
26 Complete the diagram
27 Complete the diagram Input Device Processor (CPU) Output Device Main Memory Backing Storage
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29 Which of the following are pointing devices? Trackball Touchpad MICR Mouse Plotter
30 Which of the following are pointing devices? Trackball Touchpad MICR Mouse Plotter
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32 Give an application for: Touchscreen Graphics tablet Plotter Scanner MICR OMR Barcode Reader Data Gloves LCD Projector Inkjet Printer Laser Printer Dot Matrix Printer Braille keyboard
33 Give an application for: Touchscreen educational games for pre-literate children Graphics tablet CAD for architects or draughtsmen Plotter printing of architectural plans Scanner digitising of pictures MICR processing of bank cheques OMR producing tickets in a lotto office (correction of multiple choice exam papers) Barcode Reader Bill production of POS Data Gloves Virtual Reality games LCD Projector projection of visual aids in a classroom Inkjet Printer home use e.g. for production of school projects Laser Printer a networked office Dot Matrix Printer bill production Braille keyboard input device for blind people
34
35 Define Resolution Palette Colour depth Refresh rate
36 Define Resolution A measure of the clarity of an output Screen resolution: the number of pixels on a screen Printer resolution: the number of dots per inch (dpi) Palette A palette is the range of display colours available in the computer system. Colour depth The number of colours a screen can display Refresh rate The number of times a computer screen is drawn per second is defined as refresh rate. The higher the refresh rate, the less flickering in the display output.
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38 Which of the following are raster devices? Monitor Pen Plotter Dot matrix printer Laser Printer Inkjet Printer
39 Which of the following are raster devices? Monitor Pen Plotter Dot matrix printer Laser Printer Inkjet Printer What is a vector device or application? Vector devices and applications tackle the whole output as a collection of different entities. They use geometrical formulas to represent images. What is a raster device or application? Raster graphics represent graphical images through bitmaps. The image is composed of a pattern of pixels. A raster device or application treats the output as a whole.
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41 Which of the following is a softcopy? Printout Sound output Screen output
42 Which of the following is a softcopy? Printout Sound output Screen output Softcopy Usually a temporary copy that can be easily edited. Output which is visual or auditory, so not tangible. Hardcopy A more permanent copy Output on a physical medium such as paper.
43
44 Advantages of Vector Devices
45 Advantages of Vector Devices They are more flexible than bitmaps because they can be resized and stretched. Images stored as vectors look better on devices with high resolution (monitors and printers). Bit-mapped images always appear the same regardless of a device's resolution. Vector images often require less memory than bit-mapped images.
46
47 What do the following stand for? DPI CPU MICR OMR OCR
48 What do the following stand for? DPI dots per inch CPU central processing unit MICR magnetic ink character reader OMR optical mark reader OCR optical character recognition
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50 Screen output A monitor uses 16 bit colour representation What is the colour depth of this monitor? How will the image be improved if it were to use 24-bit representation? The monitor has a maximum resolution of 1024 x 768: How many pixels is that? How many bytes are therefore needed to draw this screen once at maximum resolution? A CRT monitor s output flickers. Suggest what the problem may be.
51 Screen output A monitor uses 16 bit colour representation What is the colour depth of this monitor? 2 16 How will the image be improved if it were to use 24-bit representation? It would have more realistic colour representation and be able to produce 2 24 colours The monitor has a maximum resolution of 1024 x 768: How many pixels is that? 1024 x 768 How many bytes are therefore needed to draw this screen once at maximum resolution? 1024 x 768 x 16/8 A CRT monitor s output flickers. Suggest what the problem may be. Low refresh rate
52
53 Which of the following are impact printers? Laser Printer Inkjet Printer Dot matrix printer
54 Which of the following are impact printers? Laser Printer Inkjet Printer Dot matrix printer An impact printer produces an image by making physical contact between the printing mechanism and the paper. In non-impact printers, there is no physical contact between the printing mechanism and the paper.
55
56 What is a buffer?
57 What is a buffer? A buffer is a temporary storage area that provides a waiting area for data while the slower device catches up, enabling the CPU to do other things meanwhile.
58
59 Three types of data transfer
60 Three types of data transfer Duplex Half duplex Simplex
61
62 Name the three algorithms constructs
63 Name the three algorithms constructs Sequence Decision Loop A sequence involves a number of instructions in succession. A loop is used when the computer needs to repeat a series of instructions until a certain condition is met. A selection is a branching instruction which, depending on the value of 1 or more variables will cause one of a number of options to be executed.
64
65 What do the following stand for? ASCII ADC MODEM MSB LSB
66 What do the following stand for? ASCII American Standard Code for Information Interchange ADC Analogue to Digital Converter MODEM Modulator/Demodulator MSB Most Significant Bit LSB Lease Significant Bit
67
68 How many different characters can be displayed by ASCII?
69 How many different characters can be displayed by ASCII? 2 7 = 128
70
71 How many different characters can be displayed by Unicode?
72 How many different characters can be displayed by Unicode? 2 16
73
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