# Computing

rename
calebalex's
version from
2016-11-06 17:28

## Section 1

Question | Answer |
---|---|

What is data? | A set of recorded facts that have no meaning |

What is information? | Data after processing |

Describe the denary/decimal number system. | 10 as the base. requiring 10 different numerals |

Describe the binary number system. | 2 as the base. requiring 2 different numerals |

Describe the hexadecimal number system. | 16 as the base. requiring 16 different numerals |

Why do we need to use the binary number system in computer science? | A computer switch can only be on or off. |

Why is the hexadecimal number system used? | it is just a more convenient symbol for four binary bits |

## Section 2

Question | Answer |
---|---|

What is a character set? | A list of characters recognised by the computer hardware and software. Each character is represented by a number. |

What is ASCII? | American Standard Code for Information Interchange. It is the most common format for text files on the Internet. Each alphabetic, numeric, or special character is represented with a 7-bit binary number |

What is unicode? | International encoding standard. Each letter, digit, or symbol is assigned a unique numeric value |

## Section 3

Question | Answer |
---|---|

What is a truth table? | Electronic circuits used in computers can be wired together to form logical calculations. |

What are logic circuits? | It is when logic gates are combined |

What is Boolean algebra used for? | It is used in computer programs. When these expression are evaluated, they give a Boolean logic output of either true or false |

## Section 4

Question | Answer |
---|---|

What is a bit? | The smallest unit of data in a computer. Is a single binary digit, either 0 or 1 |

What is a byte? | Eight binary digits long |

What is a crumb? | Two binary digits |

What is a nibble? | Four binary digits. Can be conveniently represented by one hexadecimal digit. |

## Section 5

Question | Answer |
---|---|

how are instructions coded as bit patterns? | Instructions consists of an operator (The instruction) and an operand (the data) |

How does a computer know if it is reading instructions or data? | The first four bits is the operator and the last four bits is the operand |

How is sound stored? | Stored as a digital data file composed of a set of binary numbers |

What is sound sampling? | Sound sapling is the conversion of a sound wave (a continuous signal) to a sequence of samples |

What does the term sampling rate mean? | The number of samples taken per second from the analoge input |

What does the term sampling resolution mean? | The number of bits used to store each sample |

What are digital images made up of? | A series of pixels. |

What is a pixel? | The smallest element in a digital image |

How many colours can be represented by 1 bit per pixel? Which colours are these? | 2^1 black and white |

How many colours can be represented by 8 bits? | 2^8 |

How many colours can be represented by 16 bits? | 2^16 |

What is colour depth? | The number of bits for each pixel |

What is metadata? | It is data about data. It gives details of image height, width and colour depth |

What is resolution? | is the number of dots per inch (DPI) |

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