aqa
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Electronics
Monday 17 June 2024 Time allowed: The total
time for both sections of
Morning this paper is
Materials
2 hours. You are
For this paper you must have: advised to spend
a pencil and a ruler approximately
a scientific calculator
a Data and Formulae Booklet
50 minutes on this section.
a protractor.
For Examiner’s Use
Instructions
Use black ink or black ball-point pen. Question Mark
Fill in the boxes at the top of this page. 1
Answer all questions. 2
You must answer the questions in the spaces provided. Do not write
3
outside the box around each page or on blank pages.
If you need extra space for your answer(s), use the lined pages at the end 4
of this book. Write the question number against your answer(s). 5
Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
,7408/3BE
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 A toy manufacturer is designing a two-tone siren for use in small battery-operated
cars.
Figure 1 shows design Option 1.
Option 1 uses three separate signal generators feeding into a logic sub-system.
The signal generators produce logic-compatible 9 V square waves of frequencies
1024 Hz, 1 Hz and 512 Hz.
Figure 1
The waveforms shown are not to scale.
0 1
. 1 Explain how the logic level applied at B in Figure 1 determines the output frequency
at Q.
[2 marks]
0 1 . 2 Write the Boolean algebra expression for output Q in terms of the inputs A, B and C.
Use only the logic operations shown in Figure 1.
[2 marks]
Q=
final
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Electronics
Monday 17 June 2024 Time allowed: The total
time for both sections of
Morning this paper is
Materials
2 hours. You are
For this paper you must have: advised to spend
a pencil and a ruler approximately
a scientific calculator
a Data and Formulae Booklet
50 minutes on this section.
a protractor.
For Examiner’s Use
Instructions
Use black ink or black ball-point pen. Question Mark
Fill in the boxes at the top of this page. 1
Answer all questions. 2
You must answer the questions in the spaces provided. Do not write
3
outside the box around each page or on blank pages.
If you need extra space for your answer(s), use the lined pages at the end 4
of this book. Write the question number against your answer(s). 5
Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
,7408/3BE
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 A toy manufacturer is designing a two-tone siren for use in small battery-operated
cars.
Figure 1 shows design Option 1.
Option 1 uses three separate signal generators feeding into a logic sub-system.
The signal generators produce logic-compatible 9 V square waves of frequencies
1024 Hz, 1 Hz and 512 Hz.
Figure 1
The waveforms shown are not to scale.
0 1
. 1 Explain how the logic level applied at B in Figure 1 determines the output frequency
at Q.
[2 marks]
0 1 . 2 Write the Boolean algebra expression for output Q in terms of the inputs A, B and C.
Use only the logic operations shown in Figure 1.
[2 marks]
Q=
final
