Physics 9702/34 — May/June 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 the behaviour of an electrical circuit.

(a)

The positive terminals of C and the d.c. supply are already connected. Complete the circuit shown in Fig. 1.1, making sure that the positive terminals are connected as indicated on the diagram.

Fig. 1.1

(b)

(i)

Switch S should be open.

When the d.c. supply is switched on, the voltmeter reading will rise and become constant.
Switch on the d.c. supply and record the voltmeter reading $V_S$ after approximately 60 s.

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

(ii)

Calculate the value of $0.9V_S$ .

$0.9V_S$ = ______ $\text{V}$

(c)

(i)

Close switch S. The voltmeter reading will fall to zero.

(ii)

Open S and measure the time $t$ for the voltmeter reading to rise to a value $V_C$ of approximately 4.0 V.

Record $t$ and $V_C$ .

$t$ = ______ $\text{s}$
$V_C$ = ______ $\text{V}$

(d)

(i)

Write down your value of $0.9V_S$ from (b)(ii).

$0.9V_S$ = ______ $\text{V}$

(ii)

Repeat (c) for different values of $V_C$ in the range 0 to $0.9V_S$ until you have six sets of values of $t$ and $V_C$ .

(e)

(i)

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

(ii)

Draw a smooth curve through your points.

(f)

(i)

Calculate the value of $0.5V_S$ .

$0.5V_S$ = ______ $\text{V}$

(ii)

Draw the tangent to your curve at $V_C = 0.5V_S$ .

(iii)

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

gradient = ______
$y$ -intercept = ______

(g)

The tangent has the equation

V_C = at + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

(h)

Calculate the value of $T$ using the relationship

T = \frac{V_S}{2a}

$T$ = ______

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

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