AQA 2023 A-level PHYSICS 7408/3BE Paper 3 Section B Electronics Question Paper + Mark scheme [MERGED] June 2023 Materials
For this paper you must have:
a pencil and a ruler
a scientific calculator
a Data and Formulae Booklet
a protractor.
Instructions
Use black ink or bla...
AQA 2023 A-level PHYSICS 7408/3BE Paper 3 Section B Electronics Question Paper + Mark scheme [MERGED] June 2023
Please write clearly in block capitals.
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I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Electronics
Thursday 15 June 2023 Morning Time allowed: The total time for
Materials
both sections of this paper is
For this paper you must have: 2 hours. You are advised to
a pencil and a ruler spend 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
3
4
5
TOTAL
, 2
You must answer the questions in the spaces provided. Do Do not write
not write 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 of this book. Write the question number against your
answer(s).
Do all rough work in this book. Cross through any work you do
not want to be marked.
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.
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IB/M/Jun23/7408/3BE
, 3
Do not write
outside the box
0 1 Figure 1 shows the input and output pins for a 4-bit binary counter. The output pin for
the least significant bit is A.
Figure 1
0 1
. 1 Complete Figure 1 by adding a single logic gate to the binary counter so that the
circuit functions as a modulo-6 counter.
[2 marks]
Figure 2 shows three outputs of the modulo-6 counter connected to a logic
sub-system that controls a 7-segment display.
The decimal point on the display is not shown.
The whole system shown in Figure 2 is to be used as an electronic dice.
Figure 2
Segments in the 7-segment display are turned on or off by the logic sub-system
to display the decimal numbers 1 to 6 in sequence.
A segment in the display turns on when the logic output with the same letter as the
segment is at logic 1.
IB/M/Jun23/7408/3BE
, 4
Do not write
outside the
box
Table 1 shows how the values of CBA control the logic level applied to each of the
segments a to g during the counting cycle.
Table 1
Logic inputs Logic outputs
C B A a b c d e f g
0 0 0 0 1 1 0 0 0 0
0 0 1 1 1 0 1 1 0 1
0 1 0 1 1 1 1 0 0 1
0 1 1 0 1 1 0 0 1 1
1 0 0 1 0 1 1 0 1 1
1 0 1 1 0 1 1 1 1 1
0 1 . 2 One of the logic outputs a to g is controlled by a single NOT gate. This gate uses one
of the inputs A, B or C.
State the input that is used and the segment that this NOT gate controls.
[1 mark]
input =
segment =
0 1 . 3 X represents one of the logic outputs. The Boolean expression for this output is:
X = A B + C
State which of the logic outputs a to g is being controlled by this function.
[1 mark]
logic output =
Question 1 continues on the next page
Turn over ►
IB/M/Jun23/7408/3BE
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