2022_Combined science_olevel_nov_paper2

Extracted Content: 2022_Combined science_olevel_nov_paper2

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Candidate Name Centre Number Candidate Number

@

fee Pefo

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/2

PAPER 2 Theory

NOVEMBER 2022 SESSION 2 Hours

Additional materials:
Answer sheets
Calculator (Optional)
String

The Periodic Table is provided on page 15.

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 paper 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

[sestiona | |
seston |
rr

|
[Section ¢ |_|
[ue |

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

This question paper consists of 15 printed pages and 1 blank page.
Copyright: Zimbabwe School Examinations Council, N2022.

—

© ZIMSEC N2022

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( Sectlon A

rovide 2 question paper,
Answer all questiony In this section in the spaces provided on the q i

Mig lt shows a diagram of a specialised cell,

= Chloroplast

Fig.A.1
(i) Identify the cell in Vig...
(1)
(li) State the function performed by the cell shown in Fig.1.1,
ttl
(iii) Name part X.
Bi fes

4003/2 N2022

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For Cxeminer's Use (b) —_ Describe what happens to the glucose and oxygen made in a leaf.

glucose

oxygen

(c) @ Give one function of guard cells.

[1]

(ii) Explain how guard cells are adapted for the function stated in (i).

[1]
(a) Name two female sex hormones.
[2]
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% + menstrual cycle in (a) in the mens is (b) Describe the roles of the hormones named in (a)

[3]
© i) Define the term ovulation.
(1]
(if) State the range of days of the menstrual cycle when sexual
intercourse is most likely to result in pregnancy.
(1]
(a) State any two processes which can be used to support the kinetic theory.
[2]
(b) When a gas is compressed, state the property which
@ increases,
[1]

4003/2 N2022

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9)

Va
fzmninet'y
(ii) deereases,
[1]
(ili) Explain why itis casier to compress a pas than a solid,
[2]
4. A science teacher orders iron, zinc, copper and magnesium for use during
laboratory practical lessons,
From the ordered metals, state the one
(a) (i) which reacts very slowly with air to form a greenish compound,
[1]
(ii) whose powder burns to form a yellow oxide when hot,
[1]
(iii) which bums casily to form a white solid.
[1]
(b) Arrange the four metals in their order of decreasing reactivity.
a |
4003/2 N2022
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(c)

(a)

(b)

(©)

(a)

at
toys , taper suiphe
Explain why an iron nail placed in CopPe
with copper.

engine and a
State one difference between a petrol engine an

@

Gi)

6

olution becomes coated
cs

[2]

diesel engine.

[1]

Fa petrol engine.
Describe what happens during the power stroke Brae

[3]

Name any two gases which are released in car exhaust fumes.

State one effect of force.

[1]

Name the instrument used for measuring force,

[1]

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Vor {uxaminer's Use (ili) State the Standard International (8, 1) unit of fore. [1] (b) Fig.6.t shows an electric cirenit in which a cell is used to light a bulb. cell | WW, \ a | bulb Fig.6.1 Construct an energy chain for Fig.6.1. [2] (c) (i) State any one effect of energy. [1] 4003/2 N2022 [Turn over

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(it) Suggest one advantage of solar energy:

ist}

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For Section B Examiner's Use

Answer any two questions.

Write your answers on the separate answer sheets provided.
@ @ — Name the Causative pathogen of malaria. (1)
Gi) State any three symptoms of malaria. 13]
(b) State any two diseases that may be caused by tobacco smoking. [2]
© State any two effects of excessive alcohol consumption. 7]

Gi) Explain why drinking alcohol while driving is not allowed in

Zimbabwe. [2]
() @) Explain the difference between mechanical digestion and
chemical digestion. (2]
Gi) — Mention any two uses of amino acids in the body. [2]
(b) (i) Name any two types of teeth. [2]
(ii) State the function of each type of tooth named in (b)(i). (2]
(c) Describe any two ways of keeping teeth health. (2]
(a) @ Define the term asexual reproduction. (H
Gi) Describe four advantages of asexual reproduction. [4]
(bo) @ State any two methods of contraception. [2]
(ii) Describe any three effects of an increase in human population
on the environment. (3)
4003/2 N2022 reac

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10. (a)

(b)

Il. (a)

(b)

(c)

Section C
Answer any two questions.
Write your answers on the separate answer sheets provided.
(i)

Describe the manufacture of cthanol by fermentation.

(ii) State any two uses of cthanol.
(i) Name the homologous series to which ethanol belongs.

(ii) Draw the structural formula of ethanol.

An organic compound X was analysed and found to contain the
following percentages:
52.2% carbon 13.0% hydrogen 34.8% oxygen

Calculate the empirical formula of X.

Fuels release energy when they bum.

(i) State one example of a
1. gaseous fuel,
2. solid fuel.

(ii) Give two advantages of gaseous fuels over solid fuels.

Explain a danger of incomplete combustion of fuel in a bedroom which
has poor ventilation.

(i) State any two properties of an acid.

(ii) State any two properties of a base.

4003/2 N2022

[3]

For
Examiner's
Use

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12.

(b)

11

Fig.12.1 gives q flow chart showing tl : CHIOdICE tig a
> the : was ‘ :
peanut butter, Owing the domestic process of producing ae

Stage 2 stage 3

Fig.12.1

Name the equipment needed for
(i) Stage 1,

Gi) stage 3.

@) Describe what happens during stage 2.

(ii) Explain the importance of stage 2.

Gil) Describe how peanut oil is produced from peanut butter.

(iv) State any two uscs of peanut oil.

4003/2 N2022

stage 4

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©

" For
Seetion D Laxamingy,
Use

Answer any two questions.

oS aye provi nl.
Write your answers on the separate answer sheets pro vide

13. (a) A 400 kg car is moving with a constant velocity of 100 m/s.
. 2
(i) Define the term velocity. Bi
8 3
(i) Calculate the momentum of the car. A

(b) Fig.13.1 shows an inclined plane.

‘ 4m

Fig.13.1

@ Calculate the mechanical advantage, MA, of the inclined plane. [2]

(ii) Calculate the velocity ratio, VR, of the inclined plane. [2]
(iii) State any one factor that results in more energy losses in
machines. [1]
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13

f

yd
4. @) Fig.ta, Te . For
i 814-1 shows water I a pot being heated on a hot plate. eansare
Use
handle

Pot with water

- hot plate

Figdd.t

(i) State the method of heat transfer from the hot plate to the pot. {

(ii) State, giving a reason, a suitable material for making the
handle of the pot.

[2]
(iii) Explain the process of convection in terms of the kinetic
theory of matter. [3]
(6) @) Define the term lightning. {\
Gi) State any three precautions to be taken against lightning. (3]

ast oe
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15. (a)

(b)

©

@

(ii)

List any one source of light energy.

@

(1] For
Examiner's
Use

Describe the evidence that shows that light travels in a straight iy

line.

Fig. 15.1 shows two musical instruments, A and B.

Fig.15.1

Explain how sound is produced in

@
(it)
@
(i)

instrument A,

instrument B.

Define the term work.

Calculate work done when a weight

through 6.5 m.

4003/2 N2022

[2]
[2]
[1]

t of 600 N is lifted vertically
[3]

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1S

Vor
Iexaminer’s

2
DATA SHEET
The Periodic Table of the Elements
Group
————
m | viv
4 12 is
c N
we fee | lee
5 6 7
[a | 2 nu
A si P
ele) Be | mete
413 cha 5s
if 64 = 70 73 75
Cu Zn Ga Ge As
Copper ire cena Gorsan eee
2 a n Kr 3B
105 We 115 Bats bred
Ag Cd In $n Sb
Steer Cooter rar Te oy
aT 45 42 | 50 51
137 201 nl 27 23
Au Hg TE Pb Bi | Po At
Gos Neary Tear Laas Saree Saonue Acre 1
7 a 61 a 53 & L t
4 1ST 189 Bi-va 165 ver 163
*58-71 Lanthanoid series Gd Tb Dy | Ho Er Tm i
790-103 Actinoid series Seas | cucpem | cacctum | tetor | Dysccosum | ramen Ean Tras |
62 63 os 65 6 cu 68 & }
| a | 4 = relative atomic mass ]
Key X Xs atomic symbel Pu Am cm Bk Cf Es Fm Md
| Param Armencum Cour Berweiun Catton Eesiontar Ferman tere Leen
{e | © = proton {atomec) Number | op 33 o 95 96 sr 98 93 100 101

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

00M N2022

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