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CAIE A-Level Physics AS Practical Assessment Skills Questions

Practise recording and analysing CAIE practical measurements with graphs, uncertainty, gradients, apparatus choices, evaluation and correctly reported results.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • record, present and analyse practical measurements with appropriate precision, graphs and uncertainty
  • use graph gradients, intercepts and linearisation to determine physical constants
  • draw evidence-based conclusions and evaluate limitations or improvements in practical data
  • select and interpret common laboratory measurements and apparatus where question evidence supports it
  • report calculated results with units, significant figures and uncertainty

Covered syllabus points

Paper 3 Advanced Practical Skills

Question 1

[Maximum number: 1]

A micrometer is used to measure the 28.50 mm width of a plastic ruler. The micrometer reads to the nearest 0.01 mm .

What is the correct way to record this reading?

A

0.02850±0.01 m0.02850 \pm 0.01 \mathrm{~m}

B

0.0285±0.001 m0.0285 \pm 0.001 \mathrm{~m}

C

(2.850±0.001)×10−2 m(2.850 \pm 0.001) \times 10^{-2} \mathrm{~m}

D

(2.850±0.001)×10−3 m(2.850 \pm 0.001) \times 10^{-3} \mathrm{~m}

Question 2

[Maximum number: 1]

A digital meter has an accuracy of ±1%\pm 1 \%.
The meter is used to measure the current in an electrical circuit.
The reading on the meter varies between 3.04 A and 3.08 A .
What is the value of the current, with its uncertainty?

A

(3.06±0.02)A(3.06 \pm 0.02) \mathrm{A}

B

(3.06±0.04)A(3.06 \pm 0.04) \mathrm{A}

C

(3.06±0.05)A(3.06 \pm 0.05) \mathrm{A}

D

(3.06±0.07)A(3.06 \pm 0.07) \mathrm{A}

Question 3

[Maximum number: 2]

Question (a)

(a)

A smooth pebble, made from uniform rock, has the shape of an elongated sphere as shown in Fig. 1.1.

Fig. 1.1

Fig. 1.1

The length of the pebble is L. The cross-section of the pebble, in the plane perpendicular to L, is circular with a maximum radius r.

A student investigating the density of the rock makes measurements to determine the values of L, r and the mass M of the pebble as follows:

L=(0.1242±0.0001)mr=(0.0420±0.0004)mM=(1.072±0.001)kg.\begin{aligned} L & =(0.1242 \pm 0.0001) \mathrm{m} \\ r & =(0.0420 \pm 0.0004) \mathrm{m} \\ M & =(1.072 \pm 0.001) \mathrm{kg} . \end{aligned}
[ 2 ]

Question (i)

(i)

State the name of a measuring instrument suitable for making this measurement of L.

[ 1 ]

Question (ii)

(ii)

Determine the percentage uncertainty in the measurement of r.
percentage uncertainty = .....

[ 1 ]
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