JWSS 2018 P1 Solution

Setter: Mr V Surya Class Index Number Name: Jurong West Secondary School Preliminary Examinations 2018 COMPUTING 7155/01 Secondary Four Express 27 August 2018 Paper 1 0800 – 1000 2 hours Candidates answer on the Question Paper. No Additional Materials are required. MARKING SCHEME This document consists of 14 printed pages. 80 _________________________________________________________________________________

2 JWSS Preliminary Examinations 2018 Computing (7155/01) Secondary 4 Express Answer all questions 1 Draw a line to match the computer parts to the correct description. 2 Cloud services allow users to run programs and access data anywhere over the Internet without having to be at a particular physical location. Describe two safety measures you can take to prevent unauthorised access to your private information when using cloud services. (a) Safety measure 1 ……………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. (b) Safety measure 2 ……………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] Safety Measures: • Read and fully understand the privacy policy of the cloud service. • Do not store secret or confidential information on cloud services. • Ensure that the traffic between your device and the cloud service is encrypted before using the cloud service. • Constantly change your cloud passwords Control Unit ALU Secondary Storage Collection of wires for transporting data from one part to another Stores large amount of data that will not be lost when power is interrupted Part of the processor that follows instructions and decides when the data should be stored, received or transmitted Part of the processor that processes data by performing basic mathematical and logical operations [4] CPU Bus ROM

3 JWSS Preliminary Examinations 2018 Computing (7155/01) Secondary 4 Express 3 Insert five of the following words about network devices and components, in the correct place in the text below. client network hub router SSID modem server network bridge port The ……………..…………… number is used together with an IP address to uniquely identify a program that is running on a network. The ……………..…………… is a device that connects multiple devices to the same network and transmits received packets to all connected devices. The ……………..…………… is a device that converts digital signals to analog signals and vice-versa. The ……………..…………… is a 32-bit string that identifies a wireless access point and all devices connected to it. The ……………..…………… is a device that forwards packets between separate networks. [5] 4 When we use a programming language, the source code must be translated into machine code before it can be run. Identify two way