2021_Combined science_olevel_nov_paper2

Extracted Content: 2021_Combined science_olevel_nov_paper2

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Candidate Name Centre Number Candidate Number

Fer Patou

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/2
PAPER 2 Theory

NOVEMBER 2021 SESSION 2 hours

Additional materials:
Answer sheets
Caleulater (Optional)
Suing

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. For examiner’s use
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,

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

This question paper consists of 13 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examinations Council, N2021.

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Section A

Answer all the questions in this section in the spaces provided on the question paper.

1. Fig.1.1 shows a pyramid of biomass.

energy to X
herbivores
5500 xX
tonnes
Fig.1.1
(a) Define the term biomass.

[1]
(b) @ Identify the trophic level represented by X.
[1]
(ii) Explain the shape of the pyramid.
(2]
(iii) | Name the form of energy received by X.
[1]

4003/2 N2021

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(iv) State, giving a reason, the effect of decreasing the biomass of X on Z.

[2]
2. (a) Write a word equation for anaerobic respiration in mammals.
[2]
(b) —_ Describe how plants are adapted to reduce water loss due to transpiration.
[2]
(c) \elate the structure of a blood capillary to its function.
[2]
4003/2 N2021
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UAC

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3. Fig.3.1 shows the electrolysis of molten lead (II) bromide.

(a)

(b)

NN

Gi)

@

Gi)

electrode
B

Centre Number Candidate Number

4

H

crucible

Fig.3.1

Define the term e/ectrolysis.

[1]
State the product formed at each of the electrodes A and B.
A
B

[2]

Suggest the most suitable material which can be used as the electrodes.

[1]
Give two general properties of an electrode.
1
2

2]

4003/2 N2021

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5
(c) State any one reason for plating iron.
For
Bunminer’s
{1] Use
4, (a) Two reactions, A and B are shown below.

Reaction A
iron + sulphur —~* iron sulphide

Reaction B
sugar + water ——* sugar solution

@ Name a process which can be used to obtain pure water from the sugar
solution.
[1]

(ii) State the reaction, A or B, in which there is a physical change.

{1]
(iii) State any two factors that affect solubility.
1,
2.
[2]
(b) Describe the arrangement of particles in a gas.
[2}
4003/2 N2021
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CANAAN

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5 (a)
(b)
6. (a)

(I

Centre Number Candidate Number

6
@ State the law of conservation of energy.
Fo
Exam
Ua
[2]
(ii) Write the energy conversion in a stretched catapult.
[2]
Describe the Hwange thermal power generation.
[3]
@ State the formula for calculating pressure in liquids.
(1]
(ii) Calculate the pressure exerted by a 1.5 m column of water given that its

density is | 200 kgm—3,

[acceleration due to gravity = 10 ms —2]

[2]

4003/2 N2021

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7

(b) Fig.6.1 shows a model ofa siphon being used to drain a liquid.

atmospheric

tube

bucket Ee a ee

et!

ee 4 20 | container

drum-——

ground level

Fig.6.1
(0) Give two conditions that enable the siphon to work.
1
2
[2]
(ii) Describe how the siphon works.
[2]
4003/2 N202
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8

Section B
Answer any two questions in this section on the separate answer sheets provided.
7. (a) Describe any three ways that can be used to dispose household litter.
(6) () Outline the importance of maintaining clean toilets at school.

Gi) —_ List any three materials or substances that can be used for
cleaning the toilets.

() Describe any one role of the Environmental Management
Agency (EMA).

8. (a) State the function of the
1, testes,
2. sperm duct,

3. prostate gland.

(b) (i) Describe the life cycle of the bilharzia parasite.
(ii) State any three methods of preventing bilharzia.
9. (a) (@)_—s«éDeffine the term balanced diet.
(ii) State any one function of fibre in the diet.

Gil) | Name any two sources of protein for a person who does not eat
meat.

(b) Plan a meal for a manual worker's lunch indicating the nutrients
provided.

(e) State twe ways by which Ebola is transmitted in a community.

4003/2 N2021

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[3]
[3]

{1]

[3]
[4]
[3]
[1]
[1]

[4]
[2]

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9
Section C
Answer any two questions in this section on the separate answer sheets provided.
10. The electronic configurations of three elements, X, Y and Z are:
X 28,6
Y 21
Z 2,6
@ State, using X, Y or Z, the two elements that are in the same group
of the Periodic Table. [2]
(it) Give a reason for the answer in a(i). {1]

(iii) Identify, from X, Y and Z, the element that has the highest
proton number. [)]

(iv) Name the type of bonding that can exist between Y and Z. {1]

(b) () = Zisan isotope and it has eight neutrons.

Define the term isotope. [1]
(ii) State the nucleon number of Z. (1)
(c) Describe three differences in the physical properties of Y and Z. 3]
1. @ @ Define the term fvel. 1j
(ii) State any two uses of fuels. 2]
Gif) State any three alternative sources of energy other than fuels. 3]
(b) (i) ~——s Name the gas which causes global warming. 1]
(i) State any three effects of global warming. [3]
12. (a) _—_—dDefine the term neutralisation. (2)
(b) State two formulae that may be used to calculate the concentration of a
solution. [2]
4003/2'N2021

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10
(c) i — Name the process of making soap. {1]
(ii) —_ Describe how soap is produced from vegetable oil. [4] Resanlaer’s
(iil) State the second product of the process named in (i). [i]
4003/2 N2021

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Candidate Name Centre Number Candidate Number

Co)

Answer any two questions in this section on the separate answer sheets provided.

13. (a)
(b)
14, (a)
(b)
15, (a)
(b)

UAC

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Section D

@ A 2 Aelectric heater was connected to a 110 V supply for | hour.

Calculate the cost of running the electric heater for 1 hour if one
unit costs 50 cents.

(ii) State one limitation of the Ohm's law.
(iii) Name the two cables on a two pin plug.

(i) Outline how a lightning conductor should be installed for it to
protect a building.

(ii) State any one myth on lightning.
(i) Describe the operation of a direct current (d.c) motor.

(ii) ‘State any three factors that affect the speed of rotation of the
coil.

State any two uses of solar systems.

A boy pushes a wheel barrow with a force of 25 N against a frictional
force of 7 N.

(i) Define the term friction.
(ii) Calculate the resultant force on the wheel barrow.

State any two applications of friction.

4003/2 N2021

[4]
(1)
[2]

[2]
[1]
[5]

[3]
[2]

(1
[2]
{2]

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(ce) Fig.15.1 shows a borehole which is operated by a lever. The load is 120 N.

10cm 60 cm
ee ea.

effort

ground level

Fig.15.1

(i) _ State the principle of moments.
Gi) Calculate the minimum effort required to operate the pump.
(iii) State the effect of reducing the length of the effort arm.

(iv) State how friction can be reduced in the pump.

4003/2 N2021

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(1)
[2]
(1)
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For
Examion’s
Use

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The volume of one mole of any gas is 28 dm’ at room temperature and pressure (r.t.p.)

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DATA SHEET
The Periodic Table of the Elements
Group
u Ul I tv v Vi VIL oO
1 4
H He
Hydrogen Peinare
1 2
7 ) oo 12 4 16 49 20
Li Be B Cc N 1°) F Ne
Lthewen Baeyiom Bonn ‘Carbon Nutrogen Ongen Fone Neon
3 4 5 6 7 8 9 10
23 24 a 2 3 a2 365 an
Na | Mg Al si P s cl Ar 5
eau | Mapas Avernum sicco | Phowptowe | Super Chore Argon <4
W 42 3 14 4 ts {ie aT 18 Zz ——
cy 40 pty 48 St 52 55 56 59 9 cad 3S 70 7 75 79 80 a4 3 —
K Ca Sc Ti v cr Mn Fe Co Ni cu Zn Ga Ge As Se Br Kr ————!
possiars | Cream | Sexrmum | Twn | Vaneau | clromnm | Mangano Yon coat Natal coveae ne Beem | Gomanam | Arnank } Seaman | Brome | Kngon a ——
19. 20 2 22 2 a 26 26 ar 28 20 36 ct 32 33 KJ 36. EJ —
2 T dy
65 88 89 ot a 8 40T 103 108, 108 142 145, 119 1272 128 127 131 ——
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te sf Xe —
rumours | storm | yum | 2ecomum | note | Motdenum | Tectratam | Ruiter | Rroden | Pataanun sie | carmen far t pesmony | tetera | lode Yeoon =
v 3B L3 40 a a 43 “ 45 “a a 48 49 50 81 52 3 sa —
13 137 119 178 181 484 186 190 192 195 B7 201 Es 207 208 =
cs Ba ta Hf Ta w Re Os Ir Pt Au Hg Tt Pb Bi Po At Rn ES
Caesen Bucur ‘Lantharem Hatrum Tartu: ‘Torpsea Racivan Osman ign Plato Gand Mercury Teamur Lead Sanu Potonian same ‘mon —
55 ‘56 cia “) 72 3 4 75 7 WW 1 te) a cil az 83 os 85 8 —
226 ar ==
fr Ra Ac ==
Francie | dem | Aebuam —
87 a 8a f >
1 3 140 444 144 190 152 Bt 159 162 165 167 169 473 175 ———
*58-7 hanoid series —
eee ls et ce | Pr | Nd | pm | sm | Eu | Ga | Th {| by | Ho | Er | Tm] Yb | Lu =
- ctinoid series camae | Presmvoyraia | Meodymmem | Premetinen | Samaram | firccam | Gaddianm | Terbam | Dytoromim | Hommum | Ethan Traum | Yerba | tetabue —
$8 38 60 Bt 62 63 4 65 66 er 88 69 7m n
a 8 = relative atomic masa 22 238 T ==
Key x X= atomic symbol Th Pa u Np Pu Am cm Bk cf Es Fm Wd No Lr ———
; rom | Poco | uemiam | nepurman | Prsonam | Amercum | Canum | Aaceivm | contami | cemtemam | fermum | Mandeteram | Nobelum | Lawrescan Sern
J b= proton (atomic) Number | oo a 92 3 o 6 96 97 6 9 100 101 102 103 ==
——S
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