JYSS 2020 Computing P1

JUNYUAN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2020 SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS INDEX NUMBER COMPUTING 7155/01 Paper 1 Written 31 Aug 2020 Candidates answer on the Question Paper. 2 hours No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number 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 or graphs. 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 13 printed pages and 1 blank page. [Turn over For Examiner’s use 80

2 1 The following list shows five types of storage mediums: flash memory card internal hard disk CD-ROM DVD external hard disk (a) The table below shows five applications. For each application, choose the most appropriate storage medium from the list above. Application Storage Medium Storage of a text book in electronic form Storage of photographs in a mobile phone A offline backup of a complete PC file system Storage of an operating system and applications software Playback of video files [5] (b) (i) From the list above, name the storage medium which is an example of a solid state memory. [1] (ii) Give two advantages of using solid state memory. 1 2 [2]

3 4E Computing P1 2020 Prelim [Turn over 2 The following diagram shows six network terms and six descriptions. Draw a line from each network term to its best description. Network term Description Wired network A component that receives and forwards data packets using IP addressing Wireless network A combination of computers and components that are only connected using cables Bridge An internal component that allows a computer to connect to a network Router A combination of computers and components that are only connected using radio waves Network Interface Card (NIC) A combination of computing devices covering a large-scale geographical area Wide area network (WAN) A component that joins similar networks together [6]

4 3 Computers use a character set to convert text into binary numbers. One character set that can be used is ASCII. Each letter in ASCII can also be represented as a denary value. (a) The word CAR has the denary values: C A R 67 65 82 Convert the three denary values into 8-bit binary digits. 67 65 82 [3] (b) Each letter in ASCII can also be represented as a hexadecimal value. The word PEN has the 8-bit binary values: P E N 0101 0000 0100 0101 0100 1110 Convert the three 8-bit binary values into hexadecimal values. 0101 0000