Build a practice paper from 631 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 · 5 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.
A solid state drive has a capacity of 5 gibibytes.
Give an expression to calculate the number of bits in 5 gibibytes. You do not need to do the calculation.
Award one mark for each of:
Accept 5 × 1 073 741 824 × 8.
Accept 5 × 2^33 or 42 949 672 960 as a fully correct expression (2 marks).
Do not accept 5 × 1000^3 × 8, which uses decimal multiples.
Do not accept ÷ 8, which converts bits to bytes.
8 × 5 × 2^30
Why: 5 × 2^30 is the number of bytes (1) and × 8 converts bytes to bits (1).
5 × 2^30
Why: Correct number of bytes using the binary multiple 2^30 (1), but no conversion to bits.
5 × 1000^3 × 8
Why: Uses decimal 1000^3 instead of binary 1024^3, so the expression is not fully correct; no creditworthy point.
A school laptop is shared by several teachers.
Describe the purpose of giving each teacher their own user account on the laptop.
Award up to two marks for a linked description such as:
Do not accept responses about the laptop running faster or having more storage because it has more accounts.
Do not accept 'so they can log in' without saying why having separate accounts helps.
Each teacher's files are stored separately, so other teachers cannot open or change their work.
Why: Separate files for each account (1) and other teachers kept out of that work (1).
So that each teacher has their own files.
Why: First point of separate files per account (1), but no development of what this achieves (0).
So the laptop runs faster because each teacher has their own account.
Why: Gives speed as a purpose of user accounts, which is not correct for user management; no creditworthy point.
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