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Measurements and their errors

From Paper 1
6(a)*6 marks
Describe how to determine the emf and internal resistance of a cell. Include a circuit description, how the data are analysed and how to make the results accurate.
From Paper 1
81 mark
Which is the volt expressed in SI base units?
From Paper 1
301 mark
A length of 25.0 mm is measured with an uncertainty of ±0.5 mm. What is the percentage uncertainty in the area of a square with this side?
From Paper 3 (Section A + Option A: Astrophysics)
1(a)2 marks
A student determines g using a simple pendulum. Explain why she times 10 oscillations and uses a fiducial marker at the centre of the swing.
00.20.40.60.8101234L / mT² / s²databest fit
Figure 1
From Paper 3 (Section A + Option A: Astrophysics)
1(c)3 marks
For L = 1.000 m (±0.001 m) the time for 10 oscillations was 20.1 s (±0.2 s). Calculate the percentage uncertainty in g from this single reading.
From Paper 3 (Section A + Option A: Astrophysics)
1(d)2 marks
The student measured L to the top of the bob instead of its centre. Explain the effect on the graph and on her value of g.
From Paper 3 (Section A + Option A: Astrophysics)
2(b)5 marks
The gradient of a graph of R against L is 12.5 Ω m⁻¹. The diameter of the wire is 0.32 mm ± 0.01 mm. Calculate the resistivity and the percentage uncertainty in the cross-sectional area.
From Paper 3 (Section A + Option A: Astrophysics)
2(c)2 marks
The graph does not pass through the origin. Suggest why, and explain the effect on the value of resistivity.
From Paper 3 (Section A + Option A: Astrophysics)
3(b)4 marks
Results:
T / N2.04.06.08.0
f / Hz507187100
Show that the data are consistent with f ∝ √T, using a logarithmic method.
From Paper 3 (Section A + Option A: Astrophysics)
4(b)4 marks
A graph of ln(V / V) against t is a straight line of gradient −0.0435 s⁻¹. The resistor is 100 kΩ. Calculate the capacitance.
From Paper 3 (Section A + Option A: Astrophysics)
4(c)2 marks
Explain why a graph of ln V against t is more useful than V against t.
Score 0 / 32 · 0 of 11 marked

This paper is written by Plasmo in the style of the AQA A-Level Physics exam. It is not a past paper and is not produced or endorsed by the exam board.

Measurements and their errors Exam Questions: AQA A-Level Physics | Plasmo