1. What is analogue data?

Mark Scheme: Definition of analogue data - data that varies continuously and is represented by a physical quantity such as sound, light, temperature or pressure.

 

2. What is digital data?

Mark Scheme: Definition of digital data - data that consists of discrete values or symbols and is represented by binary digits.

 

3. What are the main differences between analogue and digital data?

Mark Scheme: Correct identification of differences between analogue and digital data, such as the fact that analogue data is continuous, while digital data is discrete.

 

4. Why is it necessary to convert analogue data to digital data?

Mark Scheme: Explanation of the need for ADC conversion, such as the fact that computers can only process digital data and that analogue data needs to be converted to digital data to be processed by a computer.

 

5. What is an ADC?

Mark Scheme: Definition of ADC - Analogue to Digital Converter.

 

6. How does an ADC work?

Mark Scheme: Explanation of the process of ADC conversion, such as the fact that ADC samples the analogue signal at regular intervals, assigns a binary value to each sample, and produces a digital representation of the analogue signal.

 

7. What are the factors that affect the accuracy of an ADC?

Mark Scheme: Identification of factors such as resolution, sampling rate, and the quality of the analogue-to-digital conversion circuitry.

 

8. What is the purpose of a DAC?

Mark Scheme: Definition of DAC - Digital to Analogue Converter.

 

9. Why is it necessary to convert digital data to analogue data?

Mark Scheme: Explanation of the need for DAC conversion, such as the fact that many output devices, such as speakers and displays, require analogue signals to operate.

 

10. How does a DAC work?

Mark Scheme: Explanation of the process of DAC conversion, such as the fact that DAC converts the digital signal into an analogue signal by assigning a voltage or current value to each binary value.