Why do we use hexadecimal? Answers: 3

Binary produces long strings and can be difficult to work with. Hex is shorter

Hex can be easily converted to/from binary as there is 1 hex digit per nibble.

Hex is less susceptible to error when input.

Hex takes up less storage than binary

Hex can be easily converted to/from binary as there is 1 hex digit per byte.

Why and where are check digits used? Answers: 2

Used to ensure a range of numbers have been entered correctly.

Detects errors on identification numbers.

Detects errors when adding two numbers together

Detects errors when shifting numbers

What is meant by the term character set?

Is used to describe the possible characters that can be represented in a computer system.

In a game there are a set of characters that can be played as.

The letters a-z make up all known character sets.

How many bits/bytes are used by each ASCII character?

16 bits/2 bytes to 32 bits/4 bytes

How many bits/bytes are used by each Unicode character?

16 bits/2 bytes to 32 bits/4 bytes

Why might we choose to use ASCII over Unicode? Answers: 2

It takes up less bytes per character

If we only need to use English character

If we need to use characters from other languages that don't exist in English

Why might we choose to use Unicode over ASCII?

If we need to use characters from other languages that don't exist in English

It takes up less bytes per character

If we only need to use English character

What is meant by the term bit depth/colour depth?

How many bits are allocated to each pixel

With a bit depth of 16 bits/2 byte how many possible colours could exist in an image?

4294967296 (256 x 256 x 256 x 256)

With a bit depth of 24 bits/3 byte how many possible colours could exist in an image?

4294967296 (256 x 256 x 256 x 256)

As we increase bit depth what happens to our image? Answers: 2

More colours are able to be stored

Less colours are able to be stored

What is meant by the term metadata

Data recorded by the met office.

How can audio be sampled and stored in digital form? Answers: 3

Audio file is inputted through a microphone

The sound is sampled a set number of times within a second.

amplitude of the sound is sampled

Audio file is inputted through a speaker

The pitch is sample once a second

What happens as we increase the sample per second? Answers: 3

It will more closely match the original sound wave as the increased number of samples means the wave is matches at more points

The more memory it will take up

The less memory it will take up

The less it will match the original sound wave

What happens as we increase the bits per sample? Answers: 3

The higher the quality the file

It will more closely match the original sound wave at each sample as there each sample has more possible values

The more memory it will take up

The less memory it will take up

The less it will match the original sound wave

What happens as we increase the sample interval? Answers: 3

The less memory it will take up

The less it will match the original sound wave

The number of samples per second will decrease

It will more closely match the original sound wave as the increased number of samples means the wave is matches at more points

The more memory it will take up

Which best describes sample size/bit depth?

Number of bits available for each sample

The number of bits used per second of audio

The number of audio samples captured every second

Which best describes bit rate?

The number of bits used per second of audio

Number of bits available for each sample

The number of audio samples captured every second

Which best describes Sample frequency?

The number of audio samples captured every second

Number of bits available for each sample

The number of bits used per second of audio

What is meant by compression?

It the process of encoding data so that is needs fewer bits/bytes to represent it.

It the process of encoding data so that is needs more bits/bytes to represent it.

It the process of encoding data so that is cannot be read without a key

Which of the statements below best describes lossy compression? Answers: 2

Compresses data files but does lose some of the information.

It is acceptable if some loss of accuracy is acceptable e.g. video, audio

Can compress data files without losing any of the information.

This type of compression is reversible so that the original data can be reconstructed exactly as it was before compression

Used if 100% accuracy required e.g. text files

Which of the statements below best describes lossless compression? Answers: 3

Can compress data files without losing any of the information.

This type of compression is reversible so that the original data can be reconstructed exactly as it was before compression

Used if 100% accuracy required e.g. text files

Compresses data files but does lose some of the information.

It is acceptable if some loss of accuracy is acceptable e.g. video, audio

2.6 Data Representation

Authored by Ian Currie

Computers

10th - 12th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which list has the units in the correct order (lowest to highest)

bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte

bit, byte, nibble, kilobyte, megabyte, gigabyte, terabyte, petabyte

bit, nibble, byte, kilobyte, megabyte, gigabyte, petabyte, terabyte

bit, nibble, byte, kilobyte, gigabyte, megabyte, terabyte, petabyte

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the smallest unit?

Bit

Nibble

Byte

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many bits are in a nibble?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many bits are in a byte?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many bytes are in a kilobyte?

100

1000

10000

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many kilobytes are in a megabyte?

100

1000

10000

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many megabytes are in a gigabyte?

100

1000

10000

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2.6 Data Representation

Which list has the units in the correct order (lowest to highest)

What is the smallest unit?

How many bits are in a nibble?

How many bits are in a byte?

How many bytes are in a kilobyte?

How many kilobytes are in a megabyte?

How many megabytes are in a gigabyte?

How many gigabytes are in a terabyte?

How many terabytes are in a petabyte?

Which of the following would be suitable to measure measured using just bytes?

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