2021 NASS Computing P1

Name: .............................................................................. Register no: ............. Class: ................ NGEE ANN SECONDARY SCHOOL E PRELIMINARY EXAMINATION COMPUTING 7155/01 Paper 1 Written 20 September 2021 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. Answer ALL questions. Write in dark blue or black pen. You may use pencil for any diagrams, graphs, tables or rough working. The use of an approved scientific calculator is expected, where appropriate. 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 18 printed pages and 2 blank pages. For Examiner’s Use Total /80

2 NAS/2021/PRELIM/4E/COMPUTING(7155/01) 1 (a) Four terms of computer architecture and six descriptions are given. Draw one line from each term to its appropriate description. [4] Term Description Solid-state hard disk Optical disc Read-only memory Data that is stored is volatile and can be quickly accessed by the processor when needed. Data is stored on a magnetic material that can be read or written by a magnetic “head”. Data is stored as very small pits or indentations that can be read or written by a laser Data is stored in electronic circuits called “flash memory” that have no moving parts. Data that is stored rarely has need for change or would be needed for a computer to start up. Data is stored in a square plastic enclosure composed of a thin and flexible disk of a magnetic storage medium with a fabric that removes dust particles from the spinning disk Magnetic hard disk

3 NAS/2021/PRELIM/4E/COMPUTING(7155/01) 1 (b) The central processing unit acts like the “brain” of a computer system. It contains the circuitry to interpret and execute program instructions. Complete the following paragraphs by filling in the missing terms related to the central processing unit. The ………………………………………... does all mathematical operations and logical calculations. Some computers have two such units to process two calculations simultaneously. That is called dual core technology. These units are also accompanied by several small data storage units called ……………………………………….... . The ………………………………………. receives orders from ………………………………………... in the form of instruction and decode that instruction down into specific commands for other components inside computer system. It directs the data flow and how data should be stored, transmitted and received from different parts of the computer. [4]

4 NAS/2021/PRELIM/4E/COMPUTING(7155/01) 2 A game designing company plans to create a café simulation game, where th