4003q2 specimen

Extracted Content: 4003q2 specimen

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si KC

For Performance Measuremeni

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary L evel

COMBINED SCIENCE 4003/2

PAPER 2 Theory

SPECIMEN PAPER 2 hours

Candidates answer on the question paper
Additional materials: Calculator (Optional)

Allow candidates 5 minutes to count pages before the examination.
This booklet should not be punched or stapled and pages should not be removed.

The Periodic Table which is provided as an insert should be retained by the centre.

TIME 2 hours

INSTRUCTIONS TO CANDIDATES

Write your name, Centre number and candidate number in the spaces at the top.

Write your centre and candidate number in the boxes on the top right corner of every page of this paper.
Check if the booklet has all the pages and ask the invigilator for a replacement if there are duplicate or
missing pages.

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

Section A

Answer all questions.

Section B

Answer any two questions.

Section C

Answer any two questions.

Section D

Answer any two questions.

INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question.
A copy of the Periodic Table is provided as an insert.

This specimen paper consists of 22 printed pages and 2 blank pages.
Copyright: Zimbabwe School Examinations Council, Specimen Paper.

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1. starch,

(ii) State the end product of the digestion of protein.

(b) _—_ State any one adaptation of the alveolus for efficient gaseous exchange.

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ona sunny day.
A
34
rate of
transpiration 4 -|
14
+ t t >
0600 0900 1200 1500 1800
time of day
Fig. 1.1
(c) @ Name the factor being investigated.
oe [1]
(ii) Explain the shape of the graph.
— [2]
[Total: 7]

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(a) @ State any two methods of vegetative reproduction in plants.

(ii) | Give two examples of plants that reproduce by vegetative
means.

a [2]
(b) Describe any three advantages of vegetative reproduction.

(a) The nuclide notations of elements X and Y are given below.
ix pY
@ State the number of protons and neutrons in element X.
protons

neutrons

di Give the nuclide notation for a possible isotope of Y.

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(iii) = Write the electronic configuration of element X.

(b) Calculate the relative molecular mass of sulphuric acid, H2SO4.

[Total: 7]
Fig.4. 1 shows the structure of a hydrocarbon.
H H
~ —
Fig. 4.1
(a) @ Define the term hydrocarbon.
ee 1
(ii) Name the hydrocarbon in Fig. 4.1.
ee 1
(ii) Explain why the hydrocarbon is said to be unsaturated.
ee 1
(iv) | Name the homologous series to which the hydrocarbon belongs.
1

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(a)

(b)

©

6
State any two uses of the hydrocarbon.

di State the Standard International (S.I.) unit of current.

Select two electric conductors from the list given below:

perspex; pure water; salt solution; carbon rod; sugar solution,
magnesium ribbon.

A bulb is rated 60 W, 240 V.

Calculate the current it draws.

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[Total: 7]

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pot

Fig. 6.1
(a) @ Suggest, with a reason, the most suitable colour of the pot.
colour
reason

di Explain why the solar cooker

1. is curved,

2. has a shinny surface.

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State two other ways by which heat is transmitted, apart from radiation.

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(a) Fig. 7.1 shows two types of specialised cells, A and B.

{\\\ Oe
, 3?@

A B

Fig. 7.1

@ Identify cells A and B.

(ii) Explain how cell B is adapted for its function.

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(b)

(iii)

Gi)

10

Outline how blood provides immunity to the body.

A farmer planted 640 maize seeds on a prepared piece of land and
after 7 days, 480 seeds had germinated.

Calculate the percentage germination.

[2]
[Total: 10]

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(a) Fig. 8.1 shows the structure of a flower.

@

Gi)

(iii)

position of
female sex cell

Fig. 8.1
State the functions of parts L, M and N.

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(b)

(a)

(b)

12
(iv) _ Explain how the male sex cell gets to the female sex cell.

[2]

@ Define aerobic respiration.

di State three differences between inhaled and exhaled air.

(iii) ~~ State two products of aerobic respiration in plants.

[Total 10]

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Answer any twoquestions. Write your answers in the spaces provided on the question paper.

10 Table 10.1 shows the effect of three substances A, B and C on universal indicator

solution.
Table 10.1
substance effect on universal
indicator solution
A red
B green
C purple
(a) @ State the function of the universal indicator solution.
di Deduce the nature of substances B and C.

(b) Dilute hydrochloric acid is reacted with magnesium carbonate.

@

Gi)

State the type of reaction.

Write a word equation for the reaction.

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[2]

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©

14

Chemical equations for two redox reactions are given below:

2FeCl2 + Clz2 > 2FeCl3
CuO +H2— Cu+ H20

@ Define oxidation in terms of

1. oxygen,

2. electron transfer.

di State what happens, in terms of oxidation and reduction, to FeCl2
and CuO in the two redox reactions.

FeCly

[2]
[Total: 10]

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11 Fig. 11.1 shows the blast furnace used for the extraction of iron.

molten iron

Fig. 11.1

(a) @ Name the substance that enters the furnace through S.

di State what is released through R.

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11 (b) @ Describe the main reactions which occur in the blast furnace.

oe [4]
(b) = ii) ~—s« Explain the advantages of having slag covering the molten
iron.
a [1]
() A sample of iron oxide was found to contain 70% iron.
Find the empirical formula of the iron oxide.
[3]
[Total: 10]

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17

The flow chart in Fig. 12.1 shows stages in the manufacture of sulphuric
acid.

ubstance X
oxygen subs ce water
production of
sulphur
sulphur ticxide| ———>| oleum | —__ +] product
stage 1 stage 2 stage 3 stage 4
Fig. 12.1
(a) @ Name the industrial process that produces sulphuric acid.
ee [1]
(ii) Describe the production of sulphur dioxide in stage 1.
et [1]
(iii) State the three conditions required in stage 2.
Lo
2
3 [3]

(iv) — Explain why stage 3 is necessary.

(wv) Name substance X .

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12 (a) (vi) | Write an equation for the process occurring in stage 4.

(b) State any two uses of sulphuric acid.

wo [2]
[Total: 10]

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Answer any twoquestions. Write your answers in the spaces provided on the question paper.

13 (a)

(b)

©

@ State Newton’s first law of motion.

(i) Explain why a book sliding and experiencing a frictional force
of 9 N keeps on sliding across a desk.

A block of mass 2 kg is accelerated by a force of 4 N.

Calculate the acceleration.

@ State three events which occur in the power stroke of the petrol
engine.

(ii) State one advantage of modern petrol engines over the old petrol
engines.

[1]

[Total: 10]

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14 (a) Define the term telecommunications.

(b) Give two examples of telecommunication systems.

(©) Fig. 14.1 shows the components of a communication system.

A B C
Fig. 14.1

@ Name components A and C.

di Describe the functions of component A.

@ Describe two advantages of a cellphone over a landline.

[Total 10]

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15 (a) __ Fig. 15.1 shows the energy conversion in a thermal power station.

Stage 3
Stage 4
uae | (es)
energy
Fig. 15.1

(i) Name a possible primary source of energy in Zimbabwe.

di State two disadvantages of the energy source named in (i).

(iii) Give the form of energy represented by A.

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(a)

(b)

22
(iv) Describe what happens at stages 3 and 4.

[Total: 10]

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