Edexcel GCSE Computer Science (1CP2) Exam Questions

• B Control unit (1)
• The only correct answer is B. The correct answer is control unit.
• A is not correct because the arithmetic logic unit performs arithmetic and logical operations, not decoding
• C is not correct because main memory stores instructions and data, not decoding
• D is not correct because a register holds data or addresses temporarily, not decoding

• A 32 (1)
• The only correct answer is A. The correct answer is 32.
• B is not correct because 33 is the ASCII code for the exclamation mark (!)
• C is not correct because 48 is the ASCII code for the character 0
• D is not correct because 65 is the ASCII code for the uppercase letter A

Award one mark for any of the following up to a maximum of two marks:

• An arithmetic operation, e.g. addition/subtraction/multiplication/division (1)
• A logical operation, e.g. comparing two values (is A > B?) / using AND, OR, NOT (1)

Do not accept decoding instructions, fetching instructions or controlling the timing of the CPU, as these are carried out by the control unit.

Award one mark for each of:

• 5 × 1024^3 / 5 × 1024 × 1024 × 1024 / 5 × 2^30, for the number of bytes (1)
• A fully correct expression with × 8 to convert bytes to bits, in any order, e.g. 5 × 1024^3 × 8, 8 × 5 × 2^30 (1)

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.