AQA
A-level
COMPUTER SCIENCE
Paper 2
June 2023
QUESTION PAPER
, 2
Do not write
outside the
Answer all questions. box
0 1 . 1 A sound is sampled and recorded digitally. The sound is sampled at a rate of 48 000
samples per second (Hz) for 3 minutes using a 16-bit sample resolution.
Calculate the size of the digital recording, giving your answer in mebibytes.
Give your answer rounded to 2 decimal places.
You should show your working.
[2 marks]
mebibytes
0 1 . 2 The highest frequency component in a different sound is 15 000 Hz.
What is the minimum sampling rate that should be used when recording this sound to
ensure that all the frequencies in the original waveform are preserved, so that when
the recording is played back the original sound is recreated accurately?
[1 mark]
Hz
IB/G/Jun23/7517/2
, 3
Do not write
outside the
0 1 . 3 Figure 1 shows part of the process of playing back a sound that has been sampled. box
The binary sound data is used to generate an electrical waveform.
Figure 1
A hardware component on a sound card carries out the process shown in Figure 1.
State the name of this component.
[1 mark]
4
Turn over for the next question
Turn over ►
IB/G/Jun23/7517/2
, 4
Do not write
outside the
0 2 Figure 2 shows some of the fields contained in a packet, transmitted on a box
computer network.
Figure 2
Destination Source
Payload (data) Checksum
Address Address
0 2 . 1 Name two fields typically included in a packet which are not shown in Figure 2.
[2 marks]
Field 1
Field 2
0 2 . 2 Explain what the checksum is used for and outline how the checksum’s value will
be determined.
[2 marks]
Explain what the checksum is used for
Outline how the checksum’s value will be determined
0 2 . 3 Packets of data are transmitted using packet switching.
Describe the role of a router in packet switching.
[2 marks]
6
1
IB/G/Jun23/7517/2
A-level
COMPUTER SCIENCE
Paper 2
June 2023
QUESTION PAPER
, 2
Do not write
outside the
Answer all questions. box
0 1 . 1 A sound is sampled and recorded digitally. The sound is sampled at a rate of 48 000
samples per second (Hz) for 3 minutes using a 16-bit sample resolution.
Calculate the size of the digital recording, giving your answer in mebibytes.
Give your answer rounded to 2 decimal places.
You should show your working.
[2 marks]
mebibytes
0 1 . 2 The highest frequency component in a different sound is 15 000 Hz.
What is the minimum sampling rate that should be used when recording this sound to
ensure that all the frequencies in the original waveform are preserved, so that when
the recording is played back the original sound is recreated accurately?
[1 mark]
Hz
IB/G/Jun23/7517/2
, 3
Do not write
outside the
0 1 . 3 Figure 1 shows part of the process of playing back a sound that has been sampled. box
The binary sound data is used to generate an electrical waveform.
Figure 1
A hardware component on a sound card carries out the process shown in Figure 1.
State the name of this component.
[1 mark]
4
Turn over for the next question
Turn over ►
IB/G/Jun23/7517/2
, 4
Do not write
outside the
0 2 Figure 2 shows some of the fields contained in a packet, transmitted on a box
computer network.
Figure 2
Destination Source
Payload (data) Checksum
Address Address
0 2 . 1 Name two fields typically included in a packet which are not shown in Figure 2.
[2 marks]
Field 1
Field 2
0 2 . 2 Explain what the checksum is used for and outline how the checksum’s value will
be determined.
[2 marks]
Explain what the checksum is used for
Outline how the checksum’s value will be determined
0 2 . 3 Packets of data are transmitted using packet switching.
Describe the role of a router in packet switching.
[2 marks]
6
1
IB/G/Jun23/7517/2
