plumiDifference between analogue and digital signals: AQA A‑Level Physics questions
AQA A-Level Physics past-paper questions on 3.13.2.1 Difference between analogue and digital signals, 2008–2025, with mark schemes and examiner’s reports where available.
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Q02.1
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All 10 questions on Difference between analogue and digital signals, as a list
- June 2024, Paper 3 Electronics, Q02.1 (2 marks): The mobile phone transmits digital data at a rate of 8 kilobytes per second (kB s−1) when using the SMS function. Determine the minimum time required to send 16
- June 2024, Paper 3 Electronics, Q02.2 (1 mark): Describe one origin of electrical noise in a communication system. [1 mark]
- June 2024, Paper 3 Electronics, Q02.3 (2 marks): Describe the effect that electrical noise can have: • on the signal and • on the communication system. [2 marks]
- June 2024, Paper 3 Electronics, Q05 (6 marks): Several telephone conversations need to be transmitted simultaneously between two locations. Describe the process that allows these conversations to be carried
- November 2020, Paper 3 Electronics, Q03.1 (2 marks): Explain why the sampling frequency used is suitable for this task. [2 marks]
- November 2020, Paper 3 Electronics, Q03.2 (1 mark): Calculate the number of quantisation levels available on a 16-bit encoding system. [1 mark] number of quantisation levels =
- November 2020, Paper 3 Electronics, Q03.3 (2 marks): A recorded piece of stereo music lasts for 3.5 minutes. Calculate the size, in megabytes, of the digital file needed to store this recording. [2 marks] file siz
- November 2020, Paper 3 Electronics, Q03.4 (2 marks): The music file is used by a call centre to play as background music while a phone call is on hold. However, the telephone network is designed to use a bandwidth
- June 2019, Paper 3 Electronics, Q05 (6 marks): A telephone company transmits 15 speech channels across a single transmission link. The analogue information is first subjected to pulse code modulation (PCM) b
- June 2018, Paper 3 Electronics, Q05 (6 marks): In a recording studio the output from a microphone is an analogue signal. The equipment in the studio converts this analogue signal into a digital signal before
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