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Input, Output & Storage devices. Test 1. 1. Describe the purpose of an input device (2) . to enable the user to enter data into a computer system (1). It should be able to do this quickly, efficiently & accurately. An example: Keyboard (1). 2.
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1 Describe the purpose of an input device (2). • to enable the user to enter data into a computer system (1). • It should be able to do this quickly, efficiently & accurately. An example: Keyboard (1)
2 Describe the difference between memory and backing storage (2). • Memory is short term data storage, eg RAM (1). • Backing storage is long term, secure/non volatile, eg Hard disk (1) Must have clear definition plus example
3 Describe where magnetic tape might be used for back up purposes (2). • In a large organization with a large amount of data to back-up, because magnetic tapes can hold typically hundreds of gigabytes of data (1). • Where speed of data access is not critical, because magnetic tapes store data in a serial/sequential manner (1) Must have clear definition plus reason/expansion
4 Give TWO reasons why an organization might choose to use magnetic tape rather than DVDs for back up (2). • Can be written & rewritten many times, so bit for bit it is cheaper in the long term than DVD (1). • Magnetic tapes can hold hundreds of gigabytes of data, where as DVDs are limited to typically 4.7gb (1) Must have clear definition plus explanation of sizes. Size matters!
5 A company wants to update its back up files. Why might DVDs be better for back up than magnetic tape? (2) • May not have the hardware required to use magnetic tape (eg mag tape drive) (1). • May need direct/random access to back-up data (1)
6 Give TWO places where you might find a numeric keypad used for data entry (2). • ATM (1). • Burglar alarm/ restricted entry area (1)
7 Give two types of data that a keyboard can be used to enter into a computer system (2). • Numeric (1). • Text (1)
8 What advantage do SMART cards have over magnetic strip cards? (2) • SMART cards can hold much more data than magnetic strips (1). • SMART cards are more robust as the chip is inside/protected/cannot be damaged by magnetic fields(1) OR • SMART cards can be updated instantly so can be used in place of cash, for example as public transport cards (1)
9 Where would a Chip and PIN reader be used? (2) • at EFTPOS, where secure payments need to be made(/ secure transactions are carried out1). • For example, in a supermarket or a bank (1) 1 mark for explanation, 1 for example
10 Why are Chip & PIN readers used rather than magnetic strip cards? (2) • Chip & PIN is much more secure than magnetic strip because the PIN is verified before connection with the bank is made (1) • Chip & PIN cards are much more difficult to clone than Magnetic stripe cards (1)
11 Describe TWO types of input device that are suitable for use by people with disabilities: (2) • Foot mouse—allows a user to use their feet in case of limited mobility in hands • Braille keyboard—allows blind/partially sighted users to enter original text using their keyboard • Puff stick—allows data entry by users who are unable to use hands or feet • Eye reader - converts eye movement into cursor movement or text input fro the severely disabled (or any other sensible and well researched answers)
12 What do the letters MIDI stand for? (1) • Musical Instrument Digital Interface
13 What is a MIDI instrument used for? (2) • converts the analogue output signals from the musical instrument (1) • into digital data that the computer can process (1)
14 • Laser • More expensive than an inkjet to buy • Very high quality output/good for high volumes • Inkjet • Cheaper than a laser printer to buy • BUT higher running costs than…. • Dot matrix • Noisy/noisier than laser/inkjet • Can print on multipart/continuous stationary
15 Other than magnetic tape, name TWO other magnetic storage devices: (2) • Hard drive/hard disk (1) , • floppy disk drive (1), • magnetic tape drive (1) • MUST be DEVICE, not MEDIA
16 What is the difference between a magnetic storage device and an optical storage device? (2) • Magnetic device stores data by arranging magnetized bits on the surface of the media (1). • An optical device burns the data onto the surface of the media using a laser (1)
17 Name one type of solid state storage device: (1) • Memory stick • SD Card
18 Why are solid state storage devices less likely to break down than magnetic or optical storage devices? (3) • They have no moving parts/ are usually covered with a plastic shell (1) PLUS COMPARISON TO BOTH TYPES MENTIONED: • And are therefore more robust than magnetic—cannot be affected/corrupted by strong magnetic fields/scratched (1) • And are more robust than optical (cannot be scratched or snapped) (1)
19 Describe modern Information and Communication Technology devices John would use today. (5) Five from: • Satnav system to find his way to the companies • A laptop/PDA/handheld computer for his appointments • A laptop/PDA/handheld computer/mobile phone for keeping phone numbers • Mobile phone to contact the company he was visiting when in traffic jams • An MP3 player for his music • A laptop to type up reports about his visits • Laptop + hotel phone + Internet connection to find out information about the company
20 Explain the advantages of these devices to John. (4) Four from: • Satnav – more up to date maps/easier to locate route • PDA/handheld computer – quicker/easier to search for information • Mobile phone – can be used wherever you are/can send text messages • MP3 player – smaller than CD player/stores more tracks • Laptop – easier to edit/format text • Internet – easier/quicker to search for information • Such devices are more portable than other methods