Data representation quiz

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This tests the second half of Unit 3 - everything other than the binary.

ASCII code is used to

1 point

Provide a secure basis for webpages

Display text on a monitor

Send messages via SMS

Represent a simple range of text characters and other keyboard commands

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ASCII uses 7-bits. How many individual things can it be used to represent?

1 point

255

256

128

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The character Q is represented using ASCII code 81. What ASCII code value is used to represent the character T?

1 point

Which of the following is NOT true

1 point

Unicode was developed to extend the number of characters ASCII code could be used to represent

There are over 65,000 Unicode characters

Unicode adds characters such as accents and emojis

Unicode uses the same characters as ASCII code for the first group of values

Unicode can be used to represent sounds as well as characters

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A bitmap image

1 point

Is made up of individual pixels

Can be resized perfectly

Can only be displayed on screen

Only works for black and white images

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In computer science, image size is measured in pixels, with the width given first and then the height. If I have an image which is 8 pixels by 6 pixels, what is its size?

1 point

The colour depth of an image is the number of bits used to represent each colour in an image. Modern bitmaps use 8-bits for each of red, green and blue and so have a colour depth of 24-bits. How does this impact the file size compares to a black and white bitmap

1 point

Colour bitmaps have a smaller filesize

Colour bitmaps have a larger filesize

It makes no difference

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Sound waves need to be sampled to allow computers to represent them. Sampling means:

1 point

The wave is broken down into 8 sections and each section is turned into binary values

A point on the sound wave is encoded using binary

Every possible sound on the wave is given a binary value

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A 2 second sound file is sampled at 10Hz using 8 bit sampling resolution. What is the file size in bits?

1 point

Run length encoding is a form of data compression. When data is compressed using RLE the file size is sometimes, bit not always, reduced. Compress the data string RRRGBBRR using RLE.

1 point

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