4.5.6.2 Analogue and digital data and conversion Quiz: AQA Computer Science, Unit 5

The 20 questions

1. Which term describes data that varies continuously over a smooth range of values?

   • Quantised data
   • Discrete data
   • Analogue data
   • Digital data

2. Which term describes data that is represented using discrete binary values?

   • Continuous data
   • Analogue data
   • Digital data
   • Vector data

3. What device converts continuous analogue physical signals into discrete binary values?

   • DAC
   • GPU
   • ALU
   • ADC

4. What device converts discrete binary digital signals into continuous analogue signals?

   • CPU
   • RAM
   • ADC
   • DAC

5. What is the primary application of a Digital to Analogue Converter (DAC)?

   • Image compression
   • Audio output
   • Keyboard input
   • Sensor sampling

6. Which type of hardware device is typically connected to an ADC to capture inputs?

   • Digital switch
   • Analogue sensor
   • Flash drive
   • Graphics card

7. What term describes a physical quantity, such as voltage, that varies to transmit data?

   • Bandwidth
   • Frequency
   • Signal
   • Protocol

8. How many discrete levels can an 8-bit ADC output?

   • 64
   • 128
   • 255
   • 256

9. An 8-bit ADC measures a 0 to 5 V range. What is the voltage step size?

   • 0.005 V
   • 0.156 V
   • 0.0195 V
   • 0.625 V

10. An analogue reading is sampled as 100 on a 0 to 255 scale. What is its 8-bit binary pattern?

    • 01100110
    • 01000100
    • 01100100
    • 10010000

11. A DAC receives 00000000 and its full scale is 5 V for 11111111. What voltage is output?

    • 0 V
    • -5 V
    • 2.5 V
    • 5 V

12. How does increasing the bit depth affect the analogue output signal of a DAC?

    • Speeds up transmission
    • Reduces signal power
    • Makes it smoother
    • Increases the frequency

13. How many levels does a 12-bit ADC produce?

    • 1024
    • 2048
    • 4096
    • 12

14. What process measures continuous analogue signals at regular intervals to create digital data?

    • Filtering
    • Sampling
    • Encrypting
    • Compressing

15. How many bits does an ADC need to produce 256 distinct levels?

    • 7
    • 8
    • 9
    • 16

16. What type of error occurs when an ADC rounds continuous analogue inputs to discrete digital values?

    • Parity error
    • Overflow error
    • Transmission delay
    • Quantisation error

17. What term describes the number of times an analogue signal is measured per second?

    • Bit depth
    • Frame rate
    • Sampling rate
    • Sample resolution

18. What visual shape is formed by holding digital sample values constant until the next sample arrives?

    • Triangle wave
    • Constant flat line
    • Staircase waveform
    • Smooth sine wave

19. A 10-bit ADC covers an input range of 0 to 3.3 V. What is the approximate voltage per step?

    • About 3.2 mV
    • About 32 mV
    • About 0.3 mV
    • About 3.3 V

20. Why is a digital representation of a continuous analogue signal inherently imprecise?

    • Compression failure
    • Quantisation loss
    • Parity errors
    • Metadata overhead

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