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2 questions · 3 marks
Computers manipulate binary patterns.
Convert the binary pattern 1010 0100 to denary.
Award one mark for:
164
Why: Correct: 128 + 32 + 4 = 164 (1).
37
Why: Reads the place values from the wrong end (the left-hand bit as 1), so the value is wrong.
3
Why: Counts the 1s instead of adding their place values.
Bitmap images are stored as a grid of pixels.
Define the term pixel.
Award one mark for any of the following up to a maximum of two marks:
Allow 'picture element' for element/part in the first two bullets, but not on its own
Allow 'bit depth' for colour depth
Do not accept 'picture element'/'pixel' on its own
Do not accept 'a group of pixels' or 'a dot' on its own; allow 'dot' only when it is described as the smallest element/area of the image
Do not accept 'single colour' on its own for the second mark; it must be linked to a binary value/number of bits
Do not accept 'lots of coloured dots' (it contradicts a single colour)
The smallest identifiable area of a bitmap image, which has one colour stored as a binary value.
Why: Smallest identifiable area (1) and single colour stored as a binary value (1)
The smallest part of a bitmap image, made of one colour.
Why: Smallest part (1); no credit for the second mark because the single colour is not linked to a binary value or number of bits
A picture element made from lots of coloured dots.
Why: 'Picture element' on its own is not accepted and 'lots of coloured dots' contradicts a single colour
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