How does a higher picture resolution effect quality & file size?

Quality is improved as there is more detail, file size is larger

Quality is worse, as there is less detail but a smaller file size.

Define what is meant by the term 'metadata'.

Metadata refers to information stored about an image.

Metadata is the smallest element of an image.

Metadata is the number of bits used to store the colour of a pixel.

Metadata is a lossy compression file format that allows for very compact file sizes.

Which of the following is NOT metadata that could be stored about an image?

Picture resolution measured in DPI

What formula is used to calculate the file size of an image without knowing the DPI?

Width of pixels x Height of pixels x colour depth.

Width of pixels x Height of pixels x 8

Define what is meant by the term 'colour depth'

The number of bits used to encode each pixel and thus the number of available colours

The number of pixels in an image, width*height, measured by dpi.

How does a higher colour depth i.e. 16 bit instead of 4 bit effect quality & file size?

Quality is improved as there are more colours available per pixel but file size is larger

Quality is worse, as there are less colours available per pixel but a smaller file size.

Vibrations travelling through air, water or metal.

By playing it through a hi-fi with speakers

The amplitude of a sound wave is....

How high the wave is from the crest or trough

The frequency at which it is sampled

The speed at which it travels through air

Define what is meant by 'sampling'

Height of the wave is measured, at intervals and stored as binary.

The number of samples taken each second

The number of bits used per second of audio

The amount of information required to describe one second of a sound.

Define the term 'sample rate'.

The number of samples taken each second

Height of the wave is measured, at intervals and stored as binary.

The number of bits used per second of audio

The amount of information required to describe one second of a sound.

Define what is meant by 'bit depth'

The number of bits used per second of audio

Height of the wave is measured, at intervals and stored as binary.

The number of samples taken each second

The amount of information required to describe one second of a sound.

Which three factors affect the quality of an audio clip?

Sample rate, bit rate and bit depth

Bit rate, bit depth and number of pixels

Sample rate, analogue, number of pixels

How does sample rate affect the quality of an audio clip and file size?

The more bits that are sampled the better the accuracy of the file but also the greater the file size.

The higher the bit depth, the higher the quality of the audio, but the larger the file size

Greater the frequency of the samples, the better the sound quality.

Define what is meant by the term 'character set'?

All the characters recognised/can be represented by a computer. Each character has a number.

Why was Unicode developed in 1991?

There was a need for a universal standard and more characters to cover all languages on earth.

To improve the character sets on computers

Needed so we could display non-printing characters

To replace early character sets used on teletype and teleprinting machines

Why is hexadecimal used by humans

it takes up less space on the page/screen

What does Lossy Compression do to files?

Eliminates unnecessary information in a file to reduce file size

Increases the file size and keeps the same quality

Eliminates no information at all

Decreases the file size and keeps the same quality

What is Lossless Compression?

There is no loss of information at all after compression

No information is lost but file size is increased

Files which have the exact same data after compression

Compression involves an algorithm

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Authored by Matthew White

Computers

11th Grade

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is the smallest unit of data in computing?

Kilobyte

Nibble

Bit

Base 8

Base 16

Base 2

Base 10

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What is the smallest unit of data in computing?

How many bits are there in a byte?

What is a nibble equivalent to?

What does binary data represent in computers?

What device converts analogue signals to digital data?

How many bytes are in 1 kilobyte?

What is the binary system also known as?

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