NASS 2020 P1

Name: .............................................................................. Register no: .............. Class: ...... NGEE ANN SECONDARY SCHOOL O PRELIMINARY EXAMINATION COMPUTING 7155/01 Paper 1 Written 20 August 2020 2 hours Candidates answer on the Question Paper. No Additional Materials are required. Instructions to Candidates Write your name, register number and class 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. Checked by student: _____________________ Date: _________ This document consists of 16 printed pages and 0 blank pages. For Examiner’s Use Marks /80

2 NAS/2020/Prelim/4E/7155/01 1 (a) Convert the following amounts of data in the table below: Amount of data Size in bytes 2.4 MB 5 × 10243 [1] [1] (b) James is setting up his home computer for work. He is considering between buying a 900 MHz processor chip and a 3 GHz processor chip. Describe 2 differences between the processor chips that he will need to consider before deciding which processor chip to purchase. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [2] (c) Fill in the blanks below with an appropriate word/phrase. [4] The following data flow may occur when input or output devices are used. Data is entered using an ________________ device and converted into a form that the computer can understand. This data may be temporarily stored in a __________________________________. Instructions from the running application are then interpreted. These instructions involving logical operations may require the data to be processed by the processor’s ________________________________. The _______________________ may then redirect the processed data to an output device for display in a form that users can understand.

3 NAS/2020/Prelim/4E/7155/01 2 (a) State the difference between a proprietary software and a free and open-source software (FOSS). …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [2] (b) A secondary two student requires materials from the Internet for a project report. Suggest two guidelines he should take note of to avoid committing copyright infringement. …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………