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5054/31

Physics 5054/31 — May/June 2023

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

4
questions
40
marks
90
minutes

Topics Analysis, Conclusions and Evaluation · Experimental Contexts · Observations and Measurements · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations

Q110MExperimental ContextsObservations and MeasurementsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment you will investigate specific heat capacity.

You are provided with:

  • a 100 cm3\text{cm}^3 beaker labelled A with a mark at the 25 cm3\text{cm}^3 level
  • a beaker of water labelled B
  • a thermometer
  • access to a 50 g mass at 100∘C100^\circ\text{C}.
(a)

Pour 25 cm3\text{cm}^3 of water from beaker B into beaker A.

Measure and record the temperature θ1\theta_1 of the water.

Place the thermometer back on the bench.

θ1\theta_1 = ______ ∘C^\circ\text{C}

1M
(b)

The supervisor has placed some 50 g masses in boiling water. Each mass has been tied to a length of string.

Take beaker A to where the masses are in boiling water. Using the string, remove one mass from the boiling water and place it carefully in the beaker. Do not touch the mass. Allow the string to hang over the side of beaker A and return beaker A to your workstation.

(i)

Measure and record the maximum temperature θ2\theta_2 of the water in beaker A.

θ2\theta_2 = ______ ∘C^\circ\text{C}

1M
(ii)

Describe how you make sure that your value of θ2\theta_2 is as accurate as possible.

2M
(iii)

Beaker A has a capacity of 100 cm3\text{cm}^3 and beaker B has a capacity of 250 cm3\text{cm}^3.

Explain why beaker A is more suitable for this experiment than beaker B.

1M
(iv)

Calculate the specific heat capacity cmc_m of the 50 g mass using the equation:

cm=2.1(θ2−θ1)(100−θ2)c_m = \frac{2.1(\theta_2 - \theta_1)}{(100 - \theta_2)}

Show your working.

cmc_m = ______ J / (g∘C)\text{J / (g}^\circ\text{C)}

1M
(c)
(i)

Describe two sources of error in the method used to determine cmc_m.

  1. ______
  2. ______
2M
(ii)

Suggest two improvements to the method.

  1. ______
  2. ______
2M

The rest of this paper

3 more questions
  • Q2Use of Techniques, Apparatus and Materials · Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation10M
  • Q3Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials14M
  • Q4Planning Experiments and Investigations · Analysis, Conclusions and Evaluation6M
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