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Computing Year 10 Exam Revision Flashcards
Karten in diesem Stapel (13)
- 1What are the 3 differences between ROM and RAM which are unrelated to size and purpose?1) RAM is volatile, ROM is non volatile
2) Contents of RAM change frequently, contents of ROM never/hardly change.
3) You can expand how much RAM you have, You can't expand how much ROM you have. - 2Why is virtual storage needed?It allows more data or programs to be loaded.
- 3How many bytes are in a megabyte?A million.
- 4How many bytes in a gigabyte?a billion.
- 5How many bytes in a terrabyte?a trillion billion.
- 6Use of a HTML?Layout/content of web pages.
- 7Use of a JPG?Image file.
- 8Use of an MP3?Plays audio files.
- 9Use of a PDF?Portable documents.
- 10What is meant by compression?Reduces the size of a file.
- 11What's the difference between Unicode and ASCII?1)Unicode has a larger character set.
2) ASCII has a 1 byte scheme where as Unicode has a 2 byte scheme. - 12How is the ASCII character set used to represent text in computers?Text is stored as a series of bytes. The more character, the more bytes used.
- 13What is meant by a primary key?A primary key is a unique identifier. No 2 primary keys are the same, this means if there are 2 people with the same name then the information doesn't get mixed up.
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