2023_Combined science_olevel_nov_paper2

Extracted Content: 2023_Combined science_olevel_nov_paper2

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Candidate Name Centre Number Candidate Number

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ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/2
PAPER 2 Theory

NOVEMBER 2023 SESSION

2 hours

Additional materials;
Calculator (Optional)
Answer sheets

String

The Periodic Table is provided on page 13.
Time 2 hours

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces at the top.
Section A

Answer all questions.

Write your answers in the spaces provided on the question
paper.

Section B

Answer any two questions.

Write your answers on the Separate answer sheets provided.
Section C

Answer any two questions,

Write your answers on the Separate answer sheets provided.
Section D

Answer any two questions,
Write your answers on the separate answer sheets provided.

FOR EXAMINER’S USE

second | |

Section B |
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[Section D_ | =
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This question paper consists of 13 printed pages and 3 blank pages,
Copyright: Zimbabwe School Examinations Council, N2023.

Section C

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of
each question.

®ZIMSEC N2023

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Section A

‘ i r.
Answer all questions in the spaces provided on the question pape!

1 (a) Fig.1.1 shows a specialised cell.

Fig.1.1
(i) Identify the specialised cell.
[1] |
(ii) State two adaptations of the cell in Fig. 1.1 to its function.
[2] |
(b) (i) __ Define the term discontinuous variation.
[1]
4003/2 N2023
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(ii) State any one characteristic which shows discontinuous variation.

For
Examiner
Use
[1]
(c) Explain why trophic levels are limited in a food chain.
[2]
2 (a) State the causative agent of
@) chancroid,
(1]
(ii) —_genital herpes.
(1)
(b) _ Describe one way of reducing the spread of chancroid.
(1]
(ce) Describe how HIV/AIDS differs from genital herpes.
[2]

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(d) State any two effects of syphilis on an unborn child, | t ROAD mae ce oe ee ee [2] 3 (a)

Table 3,1 Shows the effects of Substances A and B on litmus paper,

Table 3,1

) State the Purpose of the litmus paper.

(ii) Identify the acid-base nature of

[1)

1. Substance A,

2. substance B, ;
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[2]

(ili) State any one property of substance B,

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(b) Write an equation for the reaction between calcium carbonate and hydrochloric acid.

(3)
4 (a) _ Fig.4.1 shows the displayed structural formula of a hydrocarbon.
Fig.41
(i) Define the term hydrocarbon.
1)
(ii) | Name the hydrocarbon in Fig. 4.1.
fi]
(iii) Identify the homologous series to which the hydrocarbon belongs.
[1]
(iv) Explain why the hydrocarbon is said to be unsaturated.
{1]

{ONE

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6

in Fig, 4.1.
(b) (i) _~—_Deduce the empirical formula of the hydrocarbon in Fig

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a at i le
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[2} |
(ii) State any one use of the hydrocarbon.
ee er eee
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5 (a) State any one use of'a vernier callipers.

[1]

(b) _Fig,5.1 shows the scale of a vernier callipers.

Fig.5.1
State the reading shown on the vernier callipers in Fig. 5.1.

a peer IE ee
a
a ee

SS i [il]

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(c)

(b)

* 3
(i) ~~ 1 em of water has a mass of 1 g.
For
Calculate the density of 50 cm’ of water. aig

[3]

Prt 3
(ii) Convert 50 cm’ to litres,

a Ee eta
[1]

(i) State the law of magnetism.

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(ii) Give any one example of a magnetic material and a non-magnetic

Material.
magnetic
non-magnetic
[2]

Table 6.1 shows the differences between a motor and a generator.

@ Complete Table 6.1.
Table 6.1

generator

power source present absent

form of energy
produced

(ii) State any one appliance which has an electric motor.

[1]

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Section B Daa Answer any two questions on the separate answer sheets provided. 7 (a) State any three differences between inhaled and exhaled air. [3] (b) (i) State the word equation for aerobic respiration. [2]

(ii) Explain why little energy is produced during anaerobic
respiration. [2]

(iii) Give any three differences between respiration and
photosynthesis. [3]

8 (a) State any two functions of transpiration. [2]

(b) Explain any two ways in which plants are adapted to reduce water
loss by transpiration. [4]

(c) Explain why high concentration of salts in the soil reduces transpiration. [4]

9 (a) Fig.9.1 shows a blood vessel.

Fig.9.1

(i) Explain the structure of the blood vessel. [4]

(ii) State two differences in blood composition between the blood
in the aorta and the blood in the vena cava. (2]

(b) Outline the path taken by blood from the right atrium until it
reaches the left atrium. {4]

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Section C Answer an ‘ ike Y two questions on the Separate answer sheets provided. eats (a) Table 10,1 sh

fbtters arn sib characteristics of three elements A, Band C. The
ot the real symbols of the elements.

Table 10.1

(i) Complete Table 10.1 by writing the proton number of element A
and the electronic configuration of element B. {2]
(ii) State the Group to which element A belongs. (1)
(iii) Identify, using A, B or C, the element that is a noble gas. {]
(b) (i) — Drawa dot and cross diagram to show the bonding between
elements A and C. (2]
(ii) State any one physical property of the compound formed
between elements A and C. (2]
(c) Calculate the number of moles in 69 g of element A. [2]

Sulphuric acid is manufactured by the contact process.

(a) Name the two raw materials that are used in the production of sulphur
trioxide. [2]

(b) _ Give any two conditions needed for the production of sulphur trioxide. [2]

(c) Describe how each condition stated in (b) affects the production of

sulphur trioxide. (2]
(d) Describe the dilution stage in the contact process. [2]
(e) Calculate the relative molecular mass of sulphuric acid (H2SO,). [2]

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For
12 Fig.12.1 shows an experiment between iron (III) oxide (Fe:0;) and coke (C). Examiner

se
att Tron (III) oxide + coke

Fig.12.1
(a) Explain the term oxidation. {]
(b) Write a balanced chemical equation for the reaction. [2]
(c) Identify the oxidising agent in the reaction. [1]

@ Name two elements which are added to the solid product to

make stainless steel, ; [2]

(ii) State any two properties of stainless steel. [2]

(iit) Give any two uses of stainless steel. [2]
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Section D
Answer any two questions on the separate answer sheets provided.

) Fig,

13.1 shows a piece of an unidentified material being heated. After
five minutes, the heat was felt on the other end.

unidentified material

burner.

Fig.13.1

Identify, with a reason, the type of material that was used in
the investigation.

Gi)
(iii)

Explain why heat conduction is fast in solids.

State the method by which heat energy is transferred in
Fig. 13.1.

(b) (i) State any two types of potential energy.
(ii) State the law of conservation of energy.

(c) Explain why a tyre gets hot after travelling a long distance.

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| 12 | For fs Examiner 14 Fig.14,1 shows a machine used to lifta 50 kg bag of maize. Use Vig.14.1 (a) (i) Describe the principle of moments. [1] (ii) State the one way in which a machine makes work easier. (1) (b) (@) — Calculate the effort needed to just lift the 50 kg bag. (3] (ii) Calculate the mechanical advantage of the machine. (2] (iii) Give any two examples of machines that use the same principle as that shown in Fig.14.1. [2] (c) Suggest a reason why the machine in Fig. 14.1 is not 100% efficient. ty

Ss (@ Explain why copper and polythene have different electrical
conductivities. [3]

(ii) | Namea non-metal which is a good electrical conductor. Q]
(b) A Christmas tree was decorated with light bulbs. It was observed that

when one of the lights on the Christmas tree broke, the rest went off
as well.

(i) State the type of connection used to connect the light bulbs. [i]

(ii) Describe the effect of breaking one light bulb to the ammeter

reading. {1]
(c) State the function of a fuse. [1]
@) State any two safety precautions that one must take before
Tescuing an electrocuted person. [2]
(e) Give one difference between direct current (d.c) and altemating
current (a.c), {l]

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DATA SHEET
The Periodic Table of the Elements

*58-71 Lanthanoid series
t90-103 Actinoid series

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