Physics 9702/33 — October/November 2016

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 an electrical circuit.

(a)

(i)

Set up the circuit shown in Fig. 1.1.

Fig. 1.1

The distance $y$ between the crocodile clips should be approximately 80 cm.
The resistor in the component holder labelled R should have a resistance $R$ of $10\ \Omega$ .

(ii)

Record the value of $R$ .

$R$ = ______ $\Omega$

(iii)

Measure and record $y$ .

$y$ = ______

(iv)

Close the switch.

(v)

Record the ammeter reading $I$ .

$I$ = ______

(vi)

Open the switch.

(b)

(i)

Remove the resistor in the component holder labelled R.
Select a different resistor labelled with a numerical value and connect it in the component holder labelled R.
Record the value of resistance $R$ .

$R$ = ______ $\Omega$

(ii)

Close the switch.

(iii)

Adjust the position of the crocodile clips on the wire until the ammeter reading $I$ has the same value as in (a)(v).

(iv)

Measure and record $y$ .

$y$ = ______

(v)

Open the switch.

(c)

Repeat (b) until you have six sets of readings of $R$ and $y$ .

Include values of $\frac{1}{y}$ and $\frac{1}{R}$ in your table.

10M

(d)

(i)

Plot a graph of $\frac{1}{y}$ on the $y$ -axis against $\frac{1}{R}$ 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 = ______

(e)

The quantities $y$ and $R$ are related by the equation

\frac{1}{y} = -\frac{P}{R} + Q

where $P$ and $Q$ are constants.

Using your answers in (d)(iii), determine values for $P$ and $Q$ .
Give appropriate units.

$P$ = ______
$Q$ = ______

(f)

(i)

The e.m.f. $E$ of the d.c. power supply is given on the card.
Record $E$ .

$E$ = ______ $\text{V}$

(ii)

Theory suggests that

Q = \frac{PI}{E - XI}

where $X$ is the resistance of resistor X.

Use values in (a)(v), (e) and (f)(i) to determine the value of $X$ .

$X$ = ______ $\Omega$

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Q2Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation20M

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