AQA A Level Physics Paper 3A – Practice Paper Alpha with Fully Worked Solutions and Detailed Explanations

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A LEVEL
PHYSICS
Paper 3
Section 3A

Practice Paper - Alpha ≈ 70 minutes
• This is not a predicted paper, but it has questions that
are similar to the style of questions used in AQA Paper
3A exams.
• Write in black and use your pencil, ruler, calculator and
the data book - just like you would in your real exam.
• Have a go at this paper under exam conditions.
Question Mark
• The maximum mark is 45.
1
• This edition of the paper is for individual personal use
only (not for use schools). 2
• Good luck. 3

Total




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2



1 A student is carrying out an investigation to determine the resistivity of a
metal. They have been given a length of wire to use in their investigation.
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They initially use a micrometer to record values of the diameter, d, of the wire
at different positions along its length. Their results are shown in Table 1 below.


Table 1

d / mm 0.72 0.69 0.70 0.79 0.73


1.1 State the precision of the micrometer used to make these measurements.




1 mark



1.2 Calculate the value for the diameter using these results and the percentage
uncertainty in this value.
For Individual Personal Use Only




d= mm

percentage uncertainty = %

2 marks


1.3 Explain why repeat readings are likely to produce a more accurate value for
the diameter compared to a single reading.




2 marks




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