GCSE COMPUTER SCIENCE 8520/2 Paper 2 Written Assessment Mark scheme June 2020 Version: 1.0 Final

MARK SCHEME – GCSE COMPUTER SCIENCE – 8520/2 – JUNE 2020 4 Qu Part Marking guidance Total marks 01 1 Mark is for AO2 (apply) 148; 1 01 2 Mark is for AO2 (apply) 94; 1 01 3 2 marks for AO2 (apply) 8F;; If the answer given is not 8F then award a maximum of 1 working mark for any of the following: • converted 143 to ; • converted 143 to an incorrect 8-bit binary number but converted this correctly to hexadecimal; • attempted division of 143 by 16 to get a quotient of 8 and a remainder of 15 but incorrectly represented this in hexadecimal; • either the 8 or the F are present anywhere within the answer; 2 01 4 2 marks for AO2 (apply) ;; If the answer given is not then award a maximum of 1 working mark for any of the following: • converted B to 1011; • converted E to 1110; • converted BE to 190 and then incorrectly converted this value to binary; 2 MARK SCHEME – GCSE COMPUTER SCIENCE – 8520/2 – JUNE 2020 5 Qu Part Marking guidance Total marks 01 5 2 marks for AO1 (understanding) A maximum of 2 marks can be awarded. Examples include: • hexadecimal is easier (for humans) to read (than binary); A. easier to understand • numbers are displayed in a more compact way (in hexadecimal than in binary); • it is quicker to type in (hexadecimal numbers than binary numbers); • it reduces the risk of typing errors (hexadecimal numbers than binary numbers); R. individual points that imply less memory is used....