Computer Science > GCSE MARK SCHEME > Pearson Edexcel International GCSE in Computer Science (4CP0_2B) Paper 02: Application of Computatio (All)
Pearson Edexcel International GCSE in Computer Science (4CP0_2B) Paper 02: Application of Computational Thinking - C# Mark Scheme (Provisional) Summer 2021
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Question mp Answer Additional Guidance Mark 1 (a) A1 1. The only correct answer is B A is not correct because as it is an arithmetic operator C is not correct because as it is a relational operator... D is not correct because as it is a relational operator (1) Question mp Answer Additional Guidance Mark 1 (b) B1 B2 Award up to 2 marks for a linked description such as: • 1D represents items as a list (1), 2D as a table (1) • 1D is a row (1), 2D is a table (1) • Each element in 1D is a single value (1), each element in 2D is a 1D array (1) Ignore capitalisation (2) Question mp Answer Additional Guidance Mark 2 (c) Award 1 mark for each set of test data. (3) C1 Test data Expected results booksSold Either of • booksSold = 4 • profit = 4 Poor performances this week profit booksSold 5 Sales and profit are good this week profit 10 booksSold 21 Sales and profit are excellent this week profit 20 C2 C3 http://britishstudentroom.wordpress.com/Question mp Answer Additional Guidance Mark 3 (b) B1 Award up to 2 marks for a linked explanation such as: • The number of keys are limited (1) making it easy to use brute force to decrypt (1) • It can be easy to find commonly used letters (e.g. E) (1) and guess the key (1) Accept alternative similar wording. (2) Question mp Answer Additional Guidance Mark 3 (c) Award 1 mark each up to a maximum of 4 for: Encrypted letter f l m k t r w h e e Keyword letter t h i r t y t h i r Decrypted letter m e e t a t d a w n (4) C1 Ciphertext mapped to keyword in row 2 (1) C2 At least one letter decrypted correctly (1) C3 At least one word decrypted correctly (1) C4 Decrypted message ‘meet at dawn’ (1) http://britishstudentroom.wordpress.com/Question mp Answer Additional Guidance Mark 3 (d)(i) D1 Award 1 mark for: • cipherLetter / a single encrypted letter (1) Do not accept word/message/text (1) 3 (d)(ii) D2 Award 1 mark for any of: • keywordLetter • plaintextLetter Ignore case (1) 3 (d)(iii) D2 Award 1 mark for any of: • subprogram that is already defined • subprogram that is already written • subprogram that is already compiled • subprogram that can be called without having to write code for it (1) Question mp Answer Additional Guidance Mark 4 (b)(i) B1 Award up to 2 marks for a linked explanation: • binary search can be quicker than a linear search (1) as it does not have to examine each item in the list (1) • binary search halves the list each time (1) so it can be faster to find an item (1) • binary search requires fewer comparisons than a linear search to establish an item is not in the list (1) because the linear list would need to compare each item before establishing this (1) [Show More]
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