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FORM TP 221 38
SECON DARY EDUCATION CERTIFICATEEXAMINA T ION
1 1 hours
1. You MUST use this answer booklet when re s ponding to the
questions. For each question , wr iteyour answer in the space p r
ovid ed and return the answer booklet at the end o f the examinat
ion.
2. ALL WORKING MUST BE SHOWN in this booklet , since marks will
be awarded for correctsteps in calculations.
Cop yr ight 200 1 Car ibbean Examin ations Council .All r ights
reser ved .
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You are to spend no more than 1hour on this question .
A liqu id, A, initially at temperature T J = 28.4C, is heated by
an immersion heater in a container .
The resulting temperature, T 2 , is recorded at 1 minute
intervals arid the following resultsobtained .
Time, t / min. 0 I 2 3 4 5 6 7
Temperature T 2tC 28.4 36.0 43.1 525 60.5 69 .0 75.1 84.3
Temperature changes D. .Tt C 0
Cd) C p the Specific Heat Capacity of the liquid is related to
the slope S by :
Cp = 20s00 J kg -I K-I. Find the Specific Heat Capacity of the
liquid.
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(f) Another liquid, B, has a much higher specific heat capacity
than Liquid A. On thesame graph paper used in (b) on page 3 sketch
(DO NOT PLOT) a line showing theapproximate graph that would be
obtained if Liquid B was the working fluid.
(2 marks)
(g) State TWO possible sources of error in this experiment and
in EACH case describe a
method that might be used to minimize the magnitude of the
error.
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A bloek of wood measures 2 em x 4 em x 9 em . Calculate its
volume in 51units.
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(ii) Use Archimedes Principle to explain why some objects float
while others sink in the same liquid.
(iii) Explain how it is possible to predict whether a given
object will float or sink in a given liquid.
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Tw o such coils are co nnected toge ther in th e cir cuit of a
hair dr yer by means of switchesas shown in Figure 1.
Thi s dryer ha s two power settings LOW an d HIGH . A setti ng
is selected by openingor closing the switches . The table bel ow
shows the correspondence between power settin g and the state s of
the switch es.
POWER SETTING SI S2 S3
LOW OPEN CLOSED OPEN
mGH CLOSED OP E N CLOSED
Draw th e equivalent circuit for EACH setting by r ed rawing the
circu it without the
switches. In your equivalent circuit, o pen switch es are to be
left out entirely and closed switch es are to be replaced by an
unbr oken line.
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A container is filled with a liquid of density p as shown in
Figure 2. Express the pressure difference between P b - Pain terms
of p and the height h.
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The apparatus shown in Figure 3 may be used to determin e the d
ensi ty of an unknownliquid X.
The tu be has a unif or m cross-secti on and the height of the
water column i s twice that of liquid X. A and B ar e at the same
horizontal level . The pressure dif f er ence between points A an d
C is 2.5 x 103 Pa.
(ii) Express P B - P D in terms of P A and P c . [Hint : the an
swer can be ded uced w ithoutr esorting to any fu rther ca
lculation.]
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(ii) Carbon -14 is often referred to as an isotope of carbon.
Explain what is meant by the term 'isotope'.
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(c) A radioacti v~tracer has a half-life of 18hours. Calculate
the fraction of the initial activityremaining af ter 90 hours .
(d ) In a rad ioactive process the element Radium (Ra) emits
gamma radiation and decays to Radon (Rn) and Helium (He). The
equation of this process is2~~Ra --. 8~Rn + iHe . Determine the
values of A and Z.
