Candidate Name Centre Number

11

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ZIMBABWE SCHOOL BXAMINATIONS COUNCIL

General Certificate of Education Advanced Level
PHYSICS 9188/4
PAPER 4 Practical Test
NOVEMBER 2017 SESSION 2 hours 30 rninutes

Candidates answer on the question paper.

Additional materials:
As listed in Instructions to Supervisors
Electronic calculator
Graph paper

TIME 2 hours 30 minutes

INSTRUCTIONS TO CANDIDATES

Write your name, Centre number and candidate number in the spaces at the top of this page
and on any separate answer paper used.
Answer all questions.
Write your answers in the spaces provided on the question paper.
In Questions I and2, you are expected to record all your observations as soon as these observations are
made, and to plan the presentation of the records so that it is not necessary to make a fair copy of them.
The working of the answers is to be handed in. Marks are mainly given for a clear record of the
observations actually made, for their suitability and accuracy, and for the use made of them. Routine
precautions and theory are not wanted in Questions 1 and 2. You should, however, record any special
precautions you have taken so as to aid accuracy. At the end of the examination, fasten any separate
answer paper used securely to the question paper.

INFORMATION FOR CANDIDATES FOR EXAMINER'S USE

Questions I and 2 carry L8 marks each and question 3 I

carries 14 marks.
7
Additional paper and graphs should be submitted only if
it becomes trecessary to do so. 3
You are advised to spend approximately one hour on each of
Questions I and 2 and 30 minutes on Question 3 TOTAL
You are reminded of the need for good English and clear
presentation in your answers.

This question paper consists of 10 printed pages and 2 lined pages.

Copyright: Zimbabwe School Examinations Council, 2017.
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60 minutes on this question'

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In this experiment you will investigate the oscillations of a loaded multi-spring
system"

hook

spring

Fig. 1.1

(a) (l)SetuptheapparatusasshowninFig.l.lwiththeinitialmass,mof
100 g.

in a
(it) Slightly displace the mass, rr so that it performs oscillations
vertical Plane.

(iil) Make and record measurements to determine the

period, I of
oscillation of the sYstem'

Increase the mass, m for min the range 100 s

s 600 g and
(iv) g m
repeat (i) to (iii) to obtain six sets of readings'

In the table of results, include values of rc, log m

andlog L

(v) Justify the number of significant figures used for

log I'

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(b) It is suggested that I and tn arerelated by the equation, Ur
T=fim"

where a and, B are constants.

(r) Plot a graph of log (y-axis) against logm (x-axis).

(ir) Use the graph to determine the values of a and B.

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Measurements and calculations

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It is recommended that you spend about 60 minutes on this question. Uso

2 Inthis experiment you will investigate the discharging of a capacitor.

.R

Fig.2.1

(a) (r) Set up the circuit shown in Fig. 2.1 with.R : 100 Q,

(i, Close the switch and record the voltmeter reading, Vo.

Voltmeter reading %:
(iir) Calculate and record Zwhere V:0,37 x Vo

f/=

(iv) Open the switch and simultaneously skrt the stopwatch to measwe
the time, /, for the voltrneter reading to fall to I/. Record the value
of r and that of R in a table.

(v) Change the value of R and repeat (iv) to obtain six sets of readings
of ,R and / for.R in the range 100 A s .R < 350 S).

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(b) (i) Plot a graph of r(y-axis) against R(x-aris), Fa

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(ii) Determine the capacitance of the capacitor given that it is equal
to the gradient of the graph.

(iir) Use the graph to delermine the value of r when R:2 000 s).

(c) Use the apparatus of Fig. Z.l,to measure and record / using a 2 000 Q
resistor provided.

f:

(d) The resistance of the voltmeter is 5 000 Q.

Compare and comment on the values of t obtained in (b)(iii) and (c).

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Measurements and calculations

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It is recommended that you spend about 30 minutes on this question' Fc

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3 The heating effect of a coil in oil depends on the following factors:

material of the coil

number of turns of the coil

the supply voltage

Design a laboratory experiment to show how the listed factors affect the heating
effect of the coil in oil.

In your design report, pay particular attention to:

control of variables
procedure to be followed
precautions
good design features.

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