Oxford Cambridge and RSA - 2025
Tuesday 13 May 2025 – Afternoon
AS Level Computer Science
H046/01 Computing principles
Time allowed: 1 hour 15 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
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2025 OCR AS Level Computer Science H046/01 Computing principles, Exams of Computer Science
2025 OCR AS Level Computer Science H046/01 Computing principles Time allowed: 1 hour 15 minutes (Verified Question Paper With Mark Scheme Combined June 2025) INSTRUCTIONS •Use black ink. •Write your answer to each question in the space provided. You can use extra paper if you need to, but you must clearly show your candidate number, the centre number and the question numbers. •Answer all the questions. INFORMATION •The total mark for this paper is 70. •The marks for each question are shown in brackets [ ]. •Quality of extended response will be assessed in questions marked with an asterisk (*). •This document has 16 pages. ADVICE •Read each question carefully before you start your answer. OCR 2025 [601/5030/0] DC (PQ/CGW) 324947/5 OCR is an exempt Charity Turn over BLANK PAGE DO NOT WRITE ON THIS PAGE 1 The table shows the steps of the Fetch stage only of the Fetch-Decode-Execute cycle. The names of the registers are referred to as A, B, C and D. 1 The contents of
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Oxford Cambridge and RSA - 2025
Tuesday 13 May 2025 – Afternoon
AS Level Computer Science
H046/01 Computing principles
Time allowed: 1 hour 15 minutes (Verified Question Paper With Mark Scheme Combined June 2025)
INSTRUCTIONS
- Use black ink.
- Write your answer to each question in the space provided. You can use extra paper if you need to, but you must clearly show your candidate number, the centre number and the question numbers.
- Answer all the questions. INFORMATION
- The total mark for this paper is 70.
- The marks for each question are shown in brackets [ ].
- Quality of extended response will be assessed in questions marked with an asterisk ( ***** ).
- This document has 16 pages. ADVICE
- Read each question carefully before you start your answer. © OCR 2025 [601/5030/0] DC (PQ/CGW) 324947/ OCR is an exempt Charity Turn over
© OCR Turn over 1 The table shows the steps of the Fetch stage only of the Fetch-Decode-Execute cycle. The names of the registers are referred to as A, B, C and D. (^1) The contents of the Register A are copied into the Register B. 2a (^) RAM is read at the location specified by the Register B and its contents are copied into the Register C. 2b (^) Register A is incremented by 1. (^3) The contents of the Register C are copied into the Register D. (a) State the name of each register in the table. Register A Register B Register C Register D [4] (b) Describe how the performance of the Fetch-Decode-Execute cycle changes when increasing: (i) The number of cores ............................................................................................................................................ .............. .................................................................................................................................. [1] (ii) The clock speed ............................................................................................................................................ .............. .................................................................................................................................. [1]
© OCR 2* OCR Accountants is a firm of 30 employees. Each employee handles financial matters for many local businesses. The organisation runs a single large server which hosts their email, website and files about businesses they work with. Discuss the different functions of an operating system and why they are essential to the management of this single server. You should refer to the following in your answer:
- the different functions of an operating system
- how these functions can be used to manage the OCR Accountants’ server and why they are essential? [9] ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ ..............
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© OCR Turn over 3 Ben works for a company that conducts national public surveys. The surveys are given to 10 people at a time and each question has three different options to choose from: A, B or C. For each question people select one option only. (a) Identify two data methods that Ben could use to capture the data and identify a benefit of each. METHOD 1 Method .............................................................................................................................. ............... ............................................................................................................................................ .............. Benefit ............................................................................................................................... ............... ............................................................................................................................................ .............. METHOD 2 Method .............................................................................................................................. ............... ............................................................................................................................................ .............. Benefit ............................................................................................................................... ............... ............................................................................................................................................ .............. [4] (b) When the data is collated, the answers for each question are stored in separate 2- dimensional arrays. Question 1 is stored in an array called resultsQ1. Each person is stored on a separate row. Each row contains three Boolean values. True is used if that option was selected or False if that option was not selected. For example, the results for resultsQ1 are: Option A Option B Option C False False True False True False True False False True False False
© OCR Turn over In the example shown, the first person selected Option C for question one, the second person selected option B, the third person selected option A, and so on. Write pseudocode or program code that will:
- count and output which option A, B or C was selected the most in the array resultsQ
- output how many people selected the most popular option. You may assume that no two options have the same number of votes. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ ..............
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.................................................................................................................................. [7]
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© OCR 6 Beth records how many steps she has completed over a seven-day period. She stores the total number of steps for each day in a text file. For example: "9000" , "13680" , "11254" , "8258" , "12326" , "9244" , "7542" Beth would like a program that will take the values from the text file and then calculate the average number of steps per day. (a) Beth has realised that she will need to convert the data from the text file to another data type. State the data type the values will need to be converted to and state the reason why. Data type .......................................................................................................................................... ............................................................................................................................................ .............. Reason ............................................................................................................................... .............. ............................................................................................................................................ .............. [2] (b) The values from the text file are copied into a 1d-array called steps when the program starts. For example: 9,000 13,680 11,254 8,258 12,326 9,244 7, Beth passes the array steps into a function called findAverage which will return the average number of steps. (i) An alternative data structure Beth could have used is a list. Describe two differences between a list and an array. 1 .......................................................................................................................................... ............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. 2 .......................................................................................................................................... .............
© OCR (ii) Write the function findAverage that will accept the array steps as a parameter and then return the average number of steps. You should write your answer using pseudocode or program code. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. .................................................................................................................................. [5] (c) Beth needs to translate her code using a compiler or an interpreter. Describe one benefit to Beth of using a compiler instead of an interpreter. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. .................................................................................................................................. [2]
© OCR Turn over 7 A common method for representing characters is the Unicode character set. This was developed to improve the ASCII character set. (a) Explain one benefit of using Unicode instead of ASCII. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. .................................................................................................................................. [2] (b) Explain one drawback of using Unicode instead of ASCII. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. .................................................................................................................................. [2] 8 Eve has designed a logic circuit. The expression she has created for the logic circuit is: Q = ( JC / D ) 0 ( JC / JD ) 0 ( A / C / JB ) (a) Complete the Karnaugh map for this expression and state the simplified expression. You should draw groups around the cells you are using to simply this expression. Show your working. AB CD