Computing

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  • Created by: lucy2703
  • Created on: 30-04-17 08:27
What is the file type HTML used for?
to define the layout or content of web pages
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Explain one reason why a secondary storage device is needed in most computer systems
To store the files such as the operating system even when the system is switched off. This means it must be non-volatile
2 of 16
Describe the characteristics of magnetic secondary storage
It tends to be large capacity as it is relatively cheap. It is sensitive to movement of the system due to moving parts. It is used as the main storage for computers.
3 of 16
Describe the characteristics of solid state secondary storage
It tends to be small capacity as relatively expensive. There are no moving parts so not sensitive to movement. It's used when portability is important therefore portable magnetic formats are no longer used in favour of solid state storage.
4 of 16
State two benefits of a LAN
You can share files and people can access their files from any computer in the LAN
5 of 16
Describe how sampling is used when storing sound
The amplitude of the sound wave is measured at regular intervals and converted to binary
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Explain the effect of the sampling interval on the size and quantity of the sound file recorded
If the interval is smaller, you sample it more often so you have more data to store. This means there is a large file but it is closer to the original so it is more accurate.
7 of 16
Describe the advantages of using a computer system instead of a person to decide an order
Computer system is more systematic than humans so will give consistent results. Software can be used in several places. It's easier to analyse records
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Why does a computer system in a hospital need to be reliable?
Lives may be at stake if there are errors in the program
9 of 16
Why is data stored in computers in a binary format?
It means the circuit only needs to check for two states - 1 or 0 - so it results in more reliable circuits
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How is the ASCII character set used to represent text in a computer?
Each character is assigned a unique character code. Each letter is converted to its character code which is a binary number
11 of 16
Why is the ASCII character set no suitable for representing text in all languages in the world?
ASCII uses 8 bits and so can only represent 255 distinct characters. Many more character are needed for coping with all languages.
12 of 16
State two functions of the operating system
Allows multi-tasking and provides a user-interface.
13 of 16
What is meant by open source software?
The source code is distributed with the software. The customer can modify the source code and redistribute the source code with the same licence.
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Why are entities stored in separate tables and how can the tables be linked?
It avoids data redundancy and it is a one to many relationship. The primary key of one table is stored in the other table as a foreign key
15 of 16
Describe two tools in an IDE that can help when creating a program
Debugging tools highlights errors in the code. The Editor allows the user to enter the program code and auto-completes code as you type
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Other cards in this set

Card 2

Front

Explain one reason why a secondary storage device is needed in most computer systems

Back

To store the files such as the operating system even when the system is switched off. This means it must be non-volatile

Card 3

Front

Describe the characteristics of magnetic secondary storage

Back

Preview of the front of card 3

Card 4

Front

Describe the characteristics of solid state secondary storage

Back

Preview of the front of card 4

Card 5

Front

State two benefits of a LAN

Back

Preview of the front of card 5
View more cards

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