MSHS 2018 P1

Class Index Number Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATIONS SECONDARY FOUR COMPUTING 7155/01 Paper 1 Written 23 Aug 2018 2 hours Candidates answer on the Question Paper No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples. paper clips, highlighters, glue or correction fluid. Approved calculators are allowed. Answer all the 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. For Examiner’s Use This document consists of 12 printed pages. 80

2 1 (a) Convert the denary number 4351 into a hexadecimal number. Show your working. ………………………………………………………………………………………... ……………………………………………………………………………………….. ……………………………………………………………………………………….. [2] (b) Convert the binary number 11010101 into a denary number. Show your working. ……………………………………………………………………………………….. ……………………………………………………………………………………….. ……………………………………………………………………………………….. [2] (c) Describe two common uses of the hexadecimal number system. 1 ……………………………………………………………………………………... ………………………………………………………………………………………... ……………………………………………………………………………………….. 2 ……………………………………………………………………………………... ……………………………………………………………………………………….. ……………………………………………………………………………………….. [4] 2. Insert six of the following words about types of software licences in the correct places in the text below. public proprietary software freeware illegal legal public domain software shareware commercial free and open source software Most ……………………………. software are under legal protection and copyright, and they are also known as ……………………………. . Unauthorised copying is ……………………………. and majority of the source code is kept secret. Only after these legal protection have expired, been surrendered or are simply inapplicable would these programs become …………………………….. . A type of software known as ……………………………. is similar to proprietary software except that it is available for use at no cost. It usually allows users to try a limited version of the software. While ……………………………. is usually the demonstration software that is distributed for free for a specific evaluation period. [6]

3 3 Computer networks are common nowadays. Most homes are equipped with a simple modem and a router to link the mobile devices at home to the same network. Identify two other network devices. In each case, explain the function of the device. Device 1 …………………………………………………………………...…………….... Function ...…………………………………………………………………….