Pathlight 2022 Prelim_4E Computing_P1 QP

PATHLIGHT SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 EXPRESS CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER COMPUTING 7155/01 Paper 1 Written August 2022 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, Index number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Approved calculators are allowed. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. You should show all your working. The total number of marks for this paper is 80. This document consists of 14 printed pages and 2 blank pages. [Turn over

2 1 Information stored in our computers can be susceptible to data corruption. (a) What is data corruption? …...……………………………………………………………………………………………… …...…..…………………………………………………..………………………………….. [1] (b) State three ways in which data can become corrupted. 1 ………………………………………………………..……………………………………. 2 …………………………………………………………..…………………………………. 3 …………………………………………………………..……………………………… [3] (c) State one way to prevent data corruption and loss. …...……………………………………………………………………………………………… …………………………………………………………………….…………………………. [1] 2 (a) Convert the hexadecimal number A3 to denary. Show your working. ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ….………………………………………………………………………………………..….. [2] (b) Convert the binary number 1011011 to denary. Show your working. ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ….………………………………………………………………………………………..….. [2]

3 (c) Convert the denary number 105 to an 8-bit binary number. Show your working. ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ……...…………………………………………………………………………………………… ….………………………………………………………………………………………..….. [2]

4 3 A company uses spreadsheet software to monitor its monthly sales. The company records: • each sale that is transacted • whether the Goods and Sales Tax (GST) is inclusive (absorbed by the company). (a) Identify the most appropriate data type for the data in the following cell references: Cell Data type A1 A2 B3 F1 [4] (b) The cell F8 will calculate the total sales. Identify the function that will need to be entered into F8. …………….……………………………………………………………………………… [1] (c) Th