Physics 9702/33 — February/March 2022

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation

Q1Manipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will investigate the density of a liquid.

(a)

(i)

You have been provided with a U-tube containing coloured water. The U-tube has two sides, A and B, as shown in Fig. 1.1.

The wooden strip is supported by a stand and clamp (not shown in Fig. 1.1).

Fig. 1.1

• You are provided with a beaker containing oil.

Use the pipette to slowly put oil into A. Wait to allow the oil to reach the water surface.

The final length of the oil column above the water in A is $F$ . Continue adding oil until $F$ is approximately $7\text{ cm}$ , as shown in Fig. 1.2.

Fig. 1.2

• Measure and record $F$ .

$F$ = ______ $\text{cm}$

(ii)

• Use the pipette to slowly put oil into B. Wait to allow the oil to reach the water surface.

The final length of the oil column above the water in B is $h$ . Continue adding oil until $h$ is approximately $3\text{ cm}$ , as shown in Fig. 1.3.

Fig. 1.3

• Measure and record $h$ .

$h$ = ______ $\text{cm}$

• The height of the water level in A is $a$ , and the height of the water level in B is $b$ , as shown in Fig. 1.3.

Measure and record $a$ and $b$ .

$a$ = ______
$b$ = ______

• Calculate $y$ using

y = b - a

$y$ = ______

(b)

Repeat (a)(ii) with increasing amounts of oil in B until you have six sets of values of $h$ , $a$ , $b$ and $y$ .

Record your results in a table. Some of your values of $y$ may be negative.

(c)

(i)

Plot a graph of $y$ on the $y$ -axis against $h$ on the $x$ -axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and $y$ -intercept of this line.

gradient = ______
$y$ -intercept = ______

(d)

It is suggested that the quantities $y$ and $h$ are related by the equation

y = Ph + Q

where $P$ and $Q$ are constants.

Use your answers in (c)(iii) to determine the values of $P$ and $Q$ .
Give appropriate units.

$P$ = ______
$Q$ = ______

(e)

Calculate the density $\rho$ of the oil using the relationship

QR = F\rho

where $R$ is a constant with value $1.0\text{ g cm}^{-3}$ .

Include an appropriate unit and give your answer to an appropriate number of significant figures.

$\rho$ = ______

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Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations20M

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