Physics 9702/36 — October/November 2020

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)

● Connect any one of the eight resistors labelled with values in the component holder.

● Assemble the circuit shown in Fig. 1.1.

Fig. 1.1

● Record the resistance $R$ of the labelled resistor in the component holder.

$R$ = ______ $\Omega$

● Close the switch. The voltmeter reading will be non-zero.

● A, B and C are crocodile clips.

Adjust the position of B on the wire until the voltmeter reading is as close as possible to zero.

● The distance between A and B is $y$ , as shown in Fig. 1.1.

Measure and record $y$ .

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

● Open the switch.

(b)

Change the labelled resistor and determine the value of $y$ . Repeat until you have six sets of values of $R$ and $y$ .

Record your results in a table. Include values of $\frac{1}{y}$ in your table.

(c)

(i)

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

(d)

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

\frac{1}{y} = aR + b

where $a$ and $b$ are constants.

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

$a$ = ______

$b$ = ______

(e)

(i)

Measure and record the length $W$ of the wire between the crocodile clips A and C.

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

(ii)

The resistor P has resistance $P$ .

Calculate the value of $P$ using the relationship

a = \frac{1}{PW}

$P$ = ______ $\Omega$

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

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