Unit 8.1 Data Representation Flashcards

1
Q

What is the highest number you can represent with 1 byte?

A

255

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2
Q

How many bits are in one byte?

A

8

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3
Q

What is the highest two’s complement number you can represent with 8 bits?

A

127

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4
Q

What is the method for converting a binary number directly into Hexadecimal?

A

Split the 8 bits into two 4 bit nibbles.
Convert each nibble into a Denary number.
If either number is 10 - 15, convert to relevant letter.
Join the two conversions together.

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5
Q

What are the range of characters for the Hexadecimal system?

A

0 - 9, A - F

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6
Q

What base is the hexadecimal system?

A

16

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7
Q

What does ASCII stand for?

A

American Standard Coding for Information Interchange

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8
Q

What is the purpose of the ASCII system?

A

Standardised system for communicating text across the internet.

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9
Q

What are the limitations of the ASCII system?

A

Cannot be used for all languages as it cannot represent all possible characters. For example, letters with accents.

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10
Q

What is the smallest element of an image?

A

Pixel

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11
Q

What is the colour depth of an image?

A

The number of colours available to each pixel.

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12
Q

A 4 bit colour depth has how many colours?

A

16

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13
Q

When converting to digital sound, the sample rate is the…?

A

The number of samples you take in one second.

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14
Q

When converting to digital sound, the sample interval is the…?

A

Gaps between each of the samples.

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15
Q

What are the effects of reducing the sample rate and sample interval?

A

Smaller size file but poorer quality sound.

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16
Q

Convert FF from Hexadecimal to Denary.

A

255

17
Q

How many places are there between uppercase and lowercase letters?

A

32

18
Q

Convert 1001 1001 into Denary.

A

153