Flashcards
Computer Science Flashcards (GCSE)
Cards in this deck (30)
- 1What does ROM stand for?Read-Only Memory (Used to boot up and store instructions)
- 2What does RAM stand for?Random-Access Memory (Temporary memory like a webpage, or an unsaved word document)
- 3What is a database?A database is a organised store of data on a computer system and is organised so that a computer can easily select or edit data items
- 4What is an algorithm?An algorithm is a set of steps designed to solve a mathematical or other problem
- 5What is an overflow error?When a calculation gives a result bigger than your computer can handle, eg. if your computer is four bit and you get an answer that is more than that
- 6What is the difference between an IP address and a MAC address?An IP address is a location on a network where other computers can 'Talk' to that computer. (Like a phone number)
A MAC address is like a serial number for network devices like an Ethernet cable - 7What is a bit?Binary digit 1 or 0
- 8What is a byte?A byte is 8 bits
- 9What is a kilobyte?1024 bytes
- 10What is a megabyte?1024 kilobytes
- 11What is a gigabyte?1024 megabytes
- 12What does the CPU do?Controls the flow of data within the system and fetches and processes them, then sends back the results
- 13What is binary?Binary describes a numbering scheme that can only have two possible values, 0 or 1 (Off or On)
- 14What is a Logic Gate?A circuit that produces an output based on the inputs (Using binary)
- 15What is a 'NOT' logic gate?A logic gate that outputs the opposite value to the input
- 16What is a 'AND' logic gate?A logic gate that only outputs 1 if both inputs are 1
- 17What is a 'OR' logic gate?A logic gate that only outputs 1 if either, or both of the two inputs are 1
- 18What is a nibble?4 bits or half a byte
- 19What does 'HTML' stand for?Hypertext markup language
- 20Why is a secondary storage device needed?To store files like the operating system even when the system is turned off (Non-Volatile)
- 21Describe some characteristics of a magnetic storage device- Cheap meaning usually larger capacity
- Usually used as a computers main storage device
- Sensitive due to MOVING PARTS - 22Describe some characteristics of a solid state storage device- Expensive meaning usually smaller capacity
- Usually used when transferring files or when portability is important e.g. memory stick
- No moving parts - 23Name the main benefits of a LAN- Easy file sharing
- Easy resource sharing, eg: A printer can be used by all computers on a LAN
- Files can be accessed from anywhere (within the network)
- You can easily put software on all workstations if needs be - 24How can you secure workstations in a LAN?- Passwords to protect individual user accounts
- Restricting access out of work hours
- Only giving certain users full access to the network
- Using Firewalls to stop hacking - 25How does sampling work to store sound?1) The height of the sound wave is measured *At regular intervals*
2) And then converted into binary - 26How does the sample rate effect size and audio quality?The higher the sample rate the better the quality, but the size will be larger
- 27How does ASCII work?Each character is assigned a character code, this code is a binary number
- 28Why can't you use ASCII for all the languages in the world?Because ASCII only uses 8 bits, meaning it can only ever have 255/256 characters, which will not be able to cope with all the worlds languages.
- 29WOTS A LOGIC ERROR THEN?An error that does stop a program running but gives the expected output. EG 2+2=9 is a logic error, because it gives an answer, but not the expected one.
- 30—
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- GCSE Computer Science Flashcards on Computer Science Flashcards (GCSE), created by Lewis D'Arcy on 26/04/2016.
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- Lewis D'Arcy
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