2023_Combined science_olevel_mj_paper3

Extracted Content: 2023_Combined science_olevel_mj_paper3

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Candidate Nanie —— — — — - Centre Number Candidate Number

For Performance Measurement

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/3
PAPER 3 Practical Test

JUNE 2023 SESSION 1 hour 30 minutes

Candidates answer on the question paper.
Additional materials:

As listed in instructions to Supervisors
Calculator (optional)

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces at the top of this page. ~

Answer both questions.
Write your answers in the spaces provided on the question paper.

Use a sharp pencil for your drawings. Coloured pencils or crayons should not be

used.
You should show the essential steps in any calculation and record all experimental results

in the spaces provided in the question paper.
FOR EXAMINER’S USE
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] aa
at the end of each question or part question. el
en

This question paper consists of 7 printed pages and 1 blank page.
Copynght: Zimbabwe School Examinations Council, J2023.
‘©ZIMSEC 32023 Turn over

(NANO

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Examine; Ue

You are required to identify the nutritional value in a nutrient solution A,

You are provided with a test tube labelled T,, a syringe, access to nutrient solution A,
access to solution S, access to solution P, access to iodine solution, two droppers and
white paper.

(a) (i) Carry out the tests which are described in Table 1.1.
Record the observations in Table 1.1.
Write conclusions in Table 1.1.

Table 1.1

‘ery Fc

.Ocm of the nutrient
solution A into test tube T,,

Draw 2.0 cm’ of solution S
and add it to test tube T).

se a dropper to add one
drop of solution P to the

hrow away the contents
of test tube T, and
horoughly rinse the test
ube.

4003/3 12023 ©) ZIMSEG 2029
aT

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For Examiner’ Use

2, Add, using a syringe,
.0 cm of the nutrient
olution A into test tube T, |

horoughly rinse the
yringe.

hen add about 1 cm of
iodine solution and shake.

3. Use a dropper to add
lone drop of the nutrient
solution A to a white sheet
of paper.

ently wave the paper in

he air.
[11]
(ii) Identify solution S.
(iii) | Suggest the identity of solution P.
siuisj itl ps cae nRE naar age cy”
(b) _—_ State, giving a reason, one precaution that should be taken during the
experiment.
“2
4003/3 J2023
(Turn over

LANIER AAR MACAULAY

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(c) (i Explain any one nutritional deficiency of the nutrient solution A.

[2]
(ii) Explain any one nutritional advantage of the nutrient solution A.

st sl te ec ina aeahce ne meena tattar [2]

(iii) State a deficiency disease in children that may be controlled through
drinking the nutrient solution A regularly.

(1

4007/3 19092

For
Examiner’
Use

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2 You are required to determine the mechanical advantage (MA), velocity ratio (VR) and efficiency of a simple machine. You are provided with a flat bar with marked positions of the pivot, A and B. You are also provided with masses and a pivot.

(a) (i) Set up the apparatus as shown in Fig.2.1.

B “7 A position of load
k
is

10 cn

the effort

Fig.2.1

The centre of the load should be 10 cm from the end of the flat bar.
Measure and record the distances A and B from the pivot

[3]

(ii) Place a load of 100 g on the position marked A as shown in Fig. 2.1

Place masses (effort) at the position marked B (as shown in Fig.2.1)
until the load is just lifted.

Record, in Table 2.1, the total mass that just lifted the load.

Repeat the experiment two more times, recording the masses in Table

Complete Table 2.1 by converting the load and effort to newtons.

Table 2.1

4003/3 32023

A UOTVAC ALATA AL

[Turn over

For
Examiner’
Use

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MIN

For
Examiner
Use
(iii) Calculate the average effort applied in newtons.
[2]
(b) (i) Calculate the mechanical advantage (MA) of the machine.
[2]
(ii) Calculate the velocity ratio (VR) of the machine.
[2]
(iii) Calculate the efficiency of the machine.
[2]
40039 32023 (C)) Zimsec 2023

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For Examiner’ Use

(iv) © Comment on the value of the efficiency obtained in (b)(iii).

[2]

(v) State one way of increasing the efficiency of the machine.

[1]

4003/3 J2023
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