BOTSWANA EXAMINATIONS COUNCIL

Botswana General Certificate of Secondary Education

CANDIDATE
NAME

CENTRE
NUMBER
IIlIII
CANDIDATE
NUMBER IIIII
-: ,-
*M
SCIENCE : DOUBLE AWARD
."",. _liilll
""' iiii
'°
0569 /04
October/November 2015

~-
Paper4
4
1 hour 30 minutes

'ti Candidates answer on the Question Paper.

> · .,a
~ Additional Materials: 300 mm ruler.
11 1E -- - -- - - -- --
READ THESE INSTRUCTIONS FIRST
in the spaces provided at the top of this page.
Write your Centre number, candidate number and name
Write in dark blue or black pen.
working.
You may use a soft pencil for any diagrams, graphs or rough
tion fluid.
Do not use staples, paper clips, highlighters, glue or correc
DO NOT WRITE IN ANY BARCODES .

.Answer all questions.

on paper.
Write your answers in the spaces provided on the questi
bracke ts [] at the end of each question or part question.
The number of marks is given in
You may use a calculator.

A copy of the Periodic Table is printed on page 16.

For Examiner's Use

Total

This document consists of 16 printed pages.

[Turn over
@BEC 2015

fl
 2
AA experiment was performed to determine the relationship betwee_n ~e •
1 resistance of a
wire and the hea t ene rgy lost from the wire
whe n ther e is a curr ent m it.
Fig. 1.1 sho ws the set-up that was used,
with the wire con nec ted betw een poin ts
P and Q.

Fig. 1.1
(a) The diam eter d and length I of the wire
wer e mea sure d.

(i) F19- 1 -2 sho ws the mic rom eter scre w gau ge whe n mea suri ng
the diam eter d of the wire .

wire

35

mm 30

Fig. 1.2

Wha t is the diam eter d of the wire ?

d= ............ .... .. .. .. .. .. ........ .. . [1]

(ii) Fig. 1.3 sho ws a wire of leng th zdraw n to
scale.

Fig. 1.3
Mea sure and record the leng th l of the
. .m mm .
wire

/= ..................... .. ............ .... [1]

 3
For
Examiner's
(iii) Calculate the resistance R of the wire. Use the equation Uae

I
R = 0.0014 X -2 where / and d are In mm.
d

R = ..................................... [2]

(b) (I) Fig. 1.4 shows the reading of the ammeter when the switch S was closed.

A
Fig. 1.4

Record the current I measured by the ammeter.

I= ...................................... [1]

(ii) Fig. 1.5 shows a stop watch used to measure the time t for which the switch S was
closed.

min sec .lroose<

01· .:30:35
:··>: '•' ,,:··'

Fig. 1.5

Record the time tin seconds, for which the switch S was closed.

t = ...................................... [1]

(iii) Calculate the heat energy E produced in the wire in time t.

2
Use the equation E = I Rt.

energy= .................................... [1]

ni-~Ql()4/0/N/15
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 4 • ~

rials, coppe r, iron and nichrome. ~

(c) You are provided with wires made of three different mate
mm and 0.1 mm.
Each material is provided in two different diameters, 0.5
diam eter for a wire to make an
Describe how you would investigate the best material and
electrical heater.

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O O O Oo 0 1 1 0 0
I o 1 0 too o o 1 1 o o Io IO o o o IO O IO
I ■ 0 0 0 J I I O O O IO O ooo o o o O Oo O O o
o o o Io o o a o o o o o o oo ea oo o o o oo
Io Io I 00 o o o O o o o o o o o O o o o o o
• o o o . O o o • : o o O • O O O o o O O O • O O O O O O O O o O t,

·····. ................ .........

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 5
For
An experiment was perfor , Examiner's
. med to determine the refractive index n of a glass block Use

Frg. 2.1 shows th e results obtained from the experiment. ·

Fig. 2.1

(a) Measure and record

(i) the angle of incidence i,

i= .............................................

(ii} the angle of refraction r.

r= ............................................
[2]

(b) Calculate the refractive index n of the glass. Use the equation

sini
n=--
sinr ·

n = ................... ................... [1]

(c) The experiment is repeated using a larger angle of incidence i.

How will this affect the refractive index n?

...... ....... .... ................... ........ ... ... .. ... ...... .. ........ .............. .......... ........... ... .. ..................... ...... [1]

(d) Suggest one source of error that may affect the accuracy of the measurement in (a) .

..................... ....... ... ... ...... .. .... .. ............. ..................................... .... ... ...... .. ............. ......... .. . [1]

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•
which produ ces most heat energ y
A st udent performed an experiment to find the type of wood
3
when it is burned.
of different types of wood chips
She heated equal volumes of water using equa l masses
was 22 °C.
labelled P, Q and R. The initial temperature of the water
volume of water that was used .
(a) Fig. 3.1 shows a measuring cylinder containing the

200

190 ..

Fig. 3.1

Record the volume V of the water used.

V= ............................. .. ...... [1]

each type of
(b)
32
Fig. - sho'A'.s the thermometer scale readings after heating the water using
wood for 5 minutes.

wood P woodQ wood R

Fig. 3.2
3.1.
The student recorded the density of each wood in Table
the water as shown by the
Complete Table 3.1 by writing the final temperatures of
thermometer scales.
Table 3.1

wood density/ (g / cm
3
) final temperature / °C

p 0.64 42

Q 1.27

R 1.10 [1]

0569/04/O/N/ 15
nm
 7
For
Examiner's
What conclusion can be drawn from these measurements? Use

·· ·· ··················· .. ·····"··· .. ·· ··········· .. ··"···"'····""''" '···"·"'·······"' ............................................ [1]

(d) Suggest one other variable that would need to be kept constant in order to ensure that the
experiment was a fair test.

........................................................................ .................................................................. [1]

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0569/04/O/N/15
@BEC 2015
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3
•
4 A student prepared potassium chloride, KC/, by neutralizing 25 cm of a solution of potassiurn
carbonate, K2CO3, with hydrochloric acid, HC/.

Fig. 4.1 shows the set-up used.

25 cm 3 of potassium
_.....,___ carbonate solution +
methyl orange
Fig. 4.1

(a) What is the colour of methyl orange

(i) at the beginning of the experiment,

....................................................................................................................................... [1]

(ii) at the end of the experiment?

[1]
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 9
(b) The diagra ms show the bu .
. ' For
rette readings before and at the end of three titrations. Examinar's
Use
titration 1
titration 2
titration 3

(i) use the burette diagrams to complete Table 4.1.

Table 4.1

titration 1 2 3
final burette readin g/ cm 3

initial burette readin g/ cm 3

volume used/c m 3

tick the best results

[5]
(ii) Using the two best results, calculate the average volume of the acid used for
the titration.

t
average volume = ............................... [1]

(c) This averag e volume of the acid was mixed with 25 cm 3 of potassium carbon
ate solution to
obtain potass ium chlorid e solutjo n.

Descri be how you would obtain crystals of potassium chloride from the
solution.

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···
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0569/04/O/N/1 5
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 10

5 (a) Fig. 5.1 shows a set-up used in an experiment to prepare a solution of ammonia.
•
mixture of
ammonium
chloride and--_ __. - -- --,---1~ . ?===1\---a pparatus X
sodium
hydroxide
heat
lf
apparat us Y

_,.__ water
beaker - ---1

Fig. 5.1

Name the apparatus X and Y. (

X ........... ... ...... .. ................ .... ........ ........................ .......

[2] ( '
Y......................... ....................................... ............. ....

(b) The ammonia solution prepared in (a) is used to test a solution of copper(II) sulphate
solution .

What will be observed when

(i) only a few drops of ammonia solution are added,

................................................................. ..................................................................... [2]

(ii) excess ammonia solution is added to the mixture in (b)(i)?

············· ·······································...................................................... ..................................

•
·················•·" ·····••""'" ··""······· ····••"' ''·""" ...................................................................... [2]

(c) Describe how to test for the sulphate ions in aqueous copper{I I) sulphate solution.

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[3]
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0569/04/O/N/1 5
© BEC2015
 12
For
Three plants E, F and G of different species were selected randomly. Different insects Examine
which Use
visited flowers of each plant between 0800 hrs and 1000 hrs were counted.

The results are shown in Fig. 6.1.

plant E plant F plant G

~ ~ vi1 c-tf, ~
Key
~ c.-~~ q:, . c~
v~~. -
,~ ~

~
v '
.~~ ~ -bees
c~ ~ ~
* qy,
~ ,)
\l \
~
~ · V
~
(~

'l '
' '<
~~

~")
V vi
~
• ~
"
~
~
~
~ -)

. .,...., ~
<rt''· ¢
~ - butterflies
~ - wasps

,vi :;~ ,i-. ,

(~~ ~ ~"
~~ '\(

c.ff~
"
~

Fig. 6.1 f
I (a) Count the number of insects which visited each plant and record the results in Table 6.1.

Table 6.1

flower bees butterflies wasps

E
F

G
[3]
(b) Which plant is mostly visited by wasps?

....................................................................................................................................
...... [1]

© BEC 2015 0569/04/O/N/15

 13
(c) Draw a bar chart to show the number of insects
which visited plants E and F.

I
.. I
i \"
.\.
.i .
I
I
:I:
i. ,I.
I: . ·1 ;
l. :\ .. ' ;
I I .
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l - '.
. I . j ' I . I
! . I ' '•
_: \ - \ i i. . ' .. I
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.:I

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• • i l
i
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i .
i. :I
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·, .J \ \ .:
i
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I: .·.
I . I I .
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. '1• : .: !: : : . r .
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.i. . . !I '· . -·, ..-
.I 1- i . i. l I
: ·'1 l I. · l! . .. : 1, ·:. : I· I
! I . ! • 'I
I

[4]
(d) How can the investigation be improved?

........ ....................................................................
........ ............... ....... ............................. .... [1]

@BEC 2015 0569/04/O/N/15 [Turn over

 14
For
Examiner'~
Fig. 7.1 shows a photograph of the cross-section of a paw-paw fruit. Use

Fig. 7.1

(a) Make a large drawing of Fig. 7.1.

[4]

@BEC2015
0569/04/O/N/1 5
 15 For
Examiner's
Use
(b) {i) Measure and record the longest diameter of the photograph.

longest diameter= ...................................... [1]

{ii) The magnification of the fruit in the photograph is X 0.8.

Calculate the actual diameter of the fruit.

actual diameter = ........................................ [2]

(c) A small piece of the fruit was tested for fats.

Describe how the piece would be tested for fats.

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