XMSS 2020 P1

2 7155/01/Computing/2020 Preliminary Exam For Examiner’s Use

3 7155/01/Computing/2020 Preliminary Exam For Examiner’s Use 1 A computer has many different components.

4 7155/01/Computing/2020 Preliminary Exam For Examiner’s Use Study each statement. Tick to show whether the statement is True or False. Statement True False Registers are physically located inside the processor. Data on the address bus travels bi-directionally. Data and instructions on the ROM are used for startup only. Typically, solid state type of storage device transfers data faster than magnetic but slower than optical storage devices. [4] 2 Hexadecimal notation is often used in computing. (a) List two uses of hexadecimal notation in computer science. 1 ………………………………………………………………………………………. 2 ………………………………………………………………………………………. [2] (b) State two advantages of using hexadecimal notation to represent binary values. 1 ………………………………………………………………………………………. …………………………………………………………………………………………. 2 ………………………………………………………………………………………. …………………………………………………………………………………………. [2] 3 Decomposition, Pattern Recognition and Generalisation are three common problem solving techniques. (a) Decomposition is a technique of breaking down a complex problem into smaller parts. (i) Describe how it helps in problem-solving and algorithm design. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... [2]

5 7155/01/Computing/2020 Preliminary Exam For Examiner’s Use (ii) One approach to decomposing is modularity. Describe what this is. …………………………………………………………………………………... …………………………………………………………………………………... …………………………………………………………………………………... [2] (b) What is Pattern Recognition? How is it useful to solving problems? …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [3] 4 A computer network is a system of two or more computers that are connected together by a transmission medium for the exchange of data. (a) Modem is a device responsible for modulation and demodulation? What is modulation? …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [2] (b) What is the function of a router? …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [2] (c) State and explain one advantage of a wired network over a wireless network. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [2] (d) State and explain one advantage of a wireless network over a wired network. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. [2]

6 7155/01/Com