SST 2019 Prelim P1

Page 1 of 16 [Turn over SECONDARY 4 PRELIM EXAMINATION COMPUTING Paper 1 Written 7155/01 30 August 2019 (Friday) 2 hours CANDIDATE NAME CLASS INDEX NUMBER READ THESE INSTRUCTIONS FIRST Do not turn over the page until you are told to do so. Write your name, class, and index number in the spaces provided above. Write in dark blue or black pen. You may use a pencil for any diagrams. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. 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 16 printed pages. For Examiner’s Use 1 3 2 5 3 4 4 3 5 3 6 4 7 4 8 7 9 5 10 4 11 10 12 12 13 10 14 6 Total /80

Page 2 of 16 1 Fill in the blanks with the correct word(s) from the following list. address bus arithmetic logic unit control unit central processing unit data bus memory secondary storage process register RAM ROM hard disk (a) The _____________ transfers data between memory and processor. It is bi-directional. Answer: …………………………………… [1] (b) The __________ is the part of the processor that processes data by performing mathematical operations. Answer: …………………………………… [1] (c) The ___________ is where data and instructions that are needed for a computer to start up are stored. Answer: …………………………………… [1] 2 Data is used in a computer program. It can be stored as bytes. (a) What makes up one byte? ..................................................................................................................................... ..................................................................................................................................... [1] (b) Larger amounts of data can be measured in terms of megabytes or mebibytes. Convert one mebibyte to megabytes. ..................................................................................................................................... ..................................................................................................................................... [2] (c) A camera SD card has 64 gigabytes of storage space. If the size of each low resolution image is 500 kilobytes, what is the maximum number of images the SD card can store before it is full? ..................................................................................................................................... ..................................................................................................................................... .................................................................................................................................... [2