Cambridge IGCSE Computer Science Coursebook 1st Edition Sarah Lawrey, Donald Scott - Solutions

Identify two input devices that could be present in a mobile phone.
In a system there are three switches and an alarm. The alarm will sound only if switches A and B are on. If switch C is turned on then the alarm will stop.a. Write the logic statement for this problem.b. Draw the logic circuit for this problem.c. Create a truth table for this problem.
The following truth table is for the logic statement X = A XOR (B AND C).Fill in the missing values to complete the truth table. Input Output B 1. 1 1.
Draw the logic circuit for the logic statement X = (A OR B) AND C.
Consider the following logic circuit:a. Write the logic statement to represent this logic gate.b. When A = 0, B = 0 and C = 1, output X= ……..c. When A = 1, B = 0 and C = 1, output X= ……… A T.
Describe the role of a logic gate in a logic circuit.
Tick (✓) which statements are true and false about low-level languages: Statement True False Low-level languages are a computer's native language Low-level languages need to be compiled before they can be processed Low-level languages are much easier for humans to understand In a low-level
Describe the role of an assembler.
Explain the difference between a compiler and an interpreter.
Describe two advantages of high-level languages.
Describe three functions of an operating system.
Draw a line from each term to its correct definition: Connection between components in the CPU along which information travels Control unit Arithmetic and logic unit Unit that manages the flow of data through the CPU Register in which values are stored to have calculations carried out on them
Define the term 'register'.
Why can the use of cookies raise concern for an internet user?
Describe the difference between a static IP and a dynamic IP.
The Rock Factory uses a CSS to store the formatting instructions for their website. Explain what the advantages are for doing this.
Sarni wants to access a website that sells his favourite records. Explain how San will do this.
Explain how anti-virus software protects a computer.
Draw a tine to match the error detection and correction terms to the correct definitions: The number of bits transmitted are added up and this calculation is transmitted with the data Check digit Al or a0 is added as an extra bit to make the sum of the bits in a Parity check byte odd or even A
Describe two advantages of serial data transmission.
Explain what is meant by bit rate.
Kamil and his band want to record the new track they have written. How could the quality of their sound recording on a computer be improved?
Explain how ASCII is used to represent text so it can be processed by a computer.
Tom wants to send an image by email to his friend Nadia. He needs to reduce the size of the image in order to be able to send it via email. Describe two methods he could use to do this.
Tick (✓) the most suitable file extension for the following tasks: jpg .mp4 -mp3 .csv Storing holiday photos Storing holiday videos Storing a favourite song Storing data to be imported into other files
The following instruction, written in machine code, is stored in computer memory: 110000011110Convert the code into hexadecimal notation.
Explain why hexadecimal notation is sometimes used to represent binary numbers.
What is meant by the term 'byte'?
A stopwatch uses six digits to display hours, minutes and seconds: 0 1:5 4:2 3It uses a nibble of binary data for each digit displayed on the stopwatch. What time is the stopwatch stopped at when the binary nibbles show the following

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