Build a practice paper from 693 exam-style questions, each with its mark scheme and example answers. Print it, or answer it on paper and then open the mark schemes. Or browse the questions by topic.
3 questions · 4 marks
Binary, denary and hexadecimal patterns represent numbers.
Convert the binary pattern 1110 1100 to denary.
Award one mark for:
236
Why: Correct: 128 + 64 + 32 + 8 + 4 = 236 (1).
55
Why: Reads the place values from the wrong end (the left-hand bit as 1), so the value is wrong.
5
Why: Counts the 1s instead of adding their place values.
Each pixel in a bitmap image is stored using a number of bits.
Define the term colour depth.
Award one mark for any of the following:
Allow bit depth
Do not accept the number of colours a pixel can have on its own
Do not accept the number of pixels in the image (this is the resolution/image size)
The number of bits used to store the colour of one pixel.
Why: Gives the number of bits per pixel (1)
The number of colours that each pixel can use.
Why: Gives the number of colours, not the number of bits; the mark scheme does not accept this on its own
The number of pixels in the image.
Why: Confuses colour depth with resolution/image size, which the mark scheme does not accept
High-level code can be translated by a compiler or by an interpreter.
Describe how a compiler translates high-level code differently from an interpreter.
Award up to two marks for a linked description such as:
Accept the compiler point and the interpreter point in either order.
Do not accept responses about object code/executable files, when the translated code is executed, how errors are reported, or speed/memory use.
Do not accept 'the interpreter executes/runs each line' on its own, without saying that it translates one line/statement at a time.
A compiler translates the whole program in one go, while an interpreter translates one line at a time.
Why: Whole program translated in one go (1) and interpreter translates one line at a time (1).
A compiler translates the whole program in one go.
Why: Whole program translated in one go (1); no linked point about the interpreter translating a line at a time.
A compiler produces an executable file, but an interpreter does not.
Why: Describes the output, not the amount translated at a time; object code/executable files are not accepted.
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