Y11_Sept_Assessment.pdf

Computer Science (J277) Y11 Sept Assessment Kyle Dudley Please note that you may see slight differences between this paper and the original. Duration: 60 mins...

Computer Science (J277) Y11 Sept Assessment Kyle Dudley Please note that you may see slight differences between this paper and the original. Duration: 60 mins Candidates answer on the Question paper. OCR supplied materials: Additional resources may be supplied with this paper. Other materials required: Pencil Ruler (cm/mm) Candidate Candidate forename surname Centre number Candidate number INSTRUCTIONS TO CANDIDATES Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters. Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions, unless your teacher tells you otherwise. Read each question carefully. Make sure you know what you have to do before starting your answer. Where space is provided below the question, please write your answer there. You may use additional paper, or a specific Answer sheet if one is provided, but you must clearly show your candidate number, centre number and question number(s). INFORMATION FOR CANDIDATES The quality of written communication is assessed in questions marked with either a pencil or an asterisk. In History and Geography a Quality of extended response question is marked with an asterisk, while a pencil is used for questions in which Spelling, punctuation and grammar and the use of specialist terminology is assessed. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 61. The total number of marks may take into account some 'either/or' question choices. © OCR 2024. You may photocopy this page. 1 of 15 Created in ExamBuilder  1 Tick (✓) two boxes to identify the two file sizes that are equal to each other. 4 500 000 bytes 450 KB 4.5 MB 0.45 GB 2(a) Johnny is writing a program to create usernames. The first process he has developed is shown in the flowchart in Fig. 1. © OCR 2024. You may photocopy this page. 2 of 15 Created in ExamBuilder  For example, using the process in Fig. 1, Tom Ward's user name would be TomWa. State, using the process in Fig. 1, the username for Rebecca Ellis. © OCR 2024. You may photocopy this page. 3 of 15 Created in ExamBuilder  (b) Johnny has updated the process used to create usernames as follows: If the person is male, then their username is the last 3 letters of their surname and the first 2 letters of their first name. If the person is female, then their username is the first 3 letters of their first name and the first 2 letters of their surname. What would be the username for a male called Fred Biscuit using the updated process? Write an algorithm for Johnny to output a username using the updated process. © OCR 2024. You may photocopy this page. 4 of 15 Created in ExamBuilder  3 Give the output of the algorithm. day = "Monday" x = day.length print(x) 4 Convert the binary number 10110000 into hexadecimal. 5 Convert the decimal number 191 into an 8 bit binary number. © OCR 2024. You may photocopy this page. 5 of 15 Created in ExamBuilder  6 Ann wants to purchase a new computer and is looking at two models. The specification of the CPU in each computer is shown in Fig. 1. When running a 3D flight simulator, Computer 1 is likely to run faster than Computer 2. Using the information in Fig. 1, identify one reason for this. 7 Vicky has been on holiday and has taken lots of photos. The memory in her camera is now full and she needs to transfer her photos to an external secondary storage device. Define what is meant by ‘secondary storage’. © OCR 2024. You may photocopy this page. 6 of 15 Created in ExamBuilder  8 The owners of a large bakery have a Local Area Network (LAN) with a star topology. They order their supplies over the Internet. When data is transmitted from the bakery to the supplier, network protocols are used. Define what is meant by a ‘network protocol’. 9 The computer has an operating system and utility software. State the need for utility software in a computer. 10 State one difference between ROM and RAM, other than the size and the purpose. 11(a The final image file may contain metadata. Describe, using an example, what is meant by metadata. ) (b) Explain how reducing the number of colours in an image can reduce its file size. © OCR 2024. You may photocopy this page. 7 of 15 Created in ExamBuilder  12 Dru writes the following program using a high-level language. 01 function newscore(a,b) 02 temp = a*b 03 temp = temp + 1 04 return temp 05 endfunction 06 score = 18 07 name = "Dru" 08 print (score) 09 print ("name") 10 print (newscore(score,2)) 11 print (score) Describe how a character set is used to represent the string value stored in the variable name 13 Kofi uses his computer to record an audio file of himself playing his guitar. Outline what happens when the computer converts the music into a file. 14 Complete the truth table below for the Boolean statement p = NOT (A AND B). © OCR 2024. You may photocopy this page. 8 of 15 Created in ExamBuilder  15 A CPU has a clock speed of 3.8 GHz. etc. Describe what is meant by a clock speed of 3.8 GHz. 16 A computer system has a 2.5 GHz processor and 5 GB of RAM. (i) State the purpose of a CPU. (ii) State what is meant by a single core 2.5 GHz processor. 17(a Hope has a network in her house. The main devices are shown in the diagram. ) © OCR 2024. You may photocopy this page. 9 of 15 Created in ExamBuilder  Explain why Hope’s network uses a peer-to-peer model and not a client-server model. © OCR 2024. You may photocopy this page. 10 of 15 Created in ExamBuilder  (b) State whether Hope’s network is a LAN or a WAN. Justify your choice. Choice Justification 18 A restaurant has a computer-based ordering system which is running slowly. A technician has said that the hard disc drive is fragmented. Explain how defragmentation software could overcome the issue of the slow computer system. © OCR 2024. You may photocopy this page. 11 of 15 Created in ExamBuilder  19 The owners of a large bakery have a Local Area Network (LAN) with a star topology. They order their supplies over the Internet. When data is transmitted from the bakery to the supplier, network protocols are used. TCP/IP is a set of protocols based on layers. (i) With regards to network protocols, define what is meant by a ‘layer’. (ii) Describe one advantage of using layers to construct network protocols. © OCR 2024. You may photocopy this page. 12 of 15 Created in ExamBuilder  20 Three incomplete pseudocode algorithms are given with a description of the purpose of each algorithm. Write the missing arithmetic operator for each algorithm. (i) Outputting 12 to the power of 2. print(12 ……………… 2) (ii) Working out if a number is odd or even. number = 53 if number ……………… 2 == 0 then print("Even number") else print("Odd number") endif (iii) Finding the difference between two measurements. measurement1 = 300 measurement2 = 100 difference = measurement1 ……………… measurement2 © OCR 2024. You may photocopy this page. 13 of 15 Created in ExamBuilder  21 (i) The table has five components of a computer, and four statements. Tick (✓) one or more boxes in each row to identify which component(s) each statement describes. Statement MAR MDR Cache Program RAM Counter It stores a single address It stores frequently used instructions It is a register It stores all currently running data and instructions (ii) Identify the name of one register not given in part (i) and describe its purpose. Register Purpose 22 An artist has a computer that they use to create images. Their computer has both hardware and software. The hardware includes primary and secondary storage. (i) Explain why a computer needs both primary and secondary storage. © OCR 2024. You may photocopy this page. 14 of 15 Created in ExamBuilder  (ii) Give one example of a secondary storage device that the artist’s computer will have and an example of the data that will be stored on it. Secondary storage device Example data (iii) The computer has Virtual Memory (VM). The table has four statements about VM. Not all of the statements are correct. Tick (✓) the True column for the statements that are correct. Re-write any statement that is incorrect in the False column by changing the statement to make it true. Statement True False – rewrite the statement to make it true (✓) A section of primary storage is partitioned to act as virtual memory Data from ROM is transferred into VM VM is needed when RAM is full, or nearly full Data from VM is transferred back to secondary storage when needed END OF QUESTION PAPER © OCR 2024. You may photocopy this page. 15 of 15 Created in ExamBuilder Powered by TCPDF (www.tcpdf.org)