2021_Combined science_olevel_nov_paper1

Extracted Content: 2021_Combined science_olevel_nov_paper1

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Maint Paints Grate

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/1
PAPER 1 Multiple Choice

NOVEMBER 2021 SESSION | hour

Additional materials:
Multiple Choice answer sheet
Sofi clean craser
Soft pencil (type B or IIB is recommended)
Calculator (optional)

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so.
Write your name, Centre number and candidate number on the answer sheet in the spaces
provided unless this has already been done for you.

There are forty questions in this paper. Answer all questions.

For each question, there are four possible answers, A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the separate
answer sheet.

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark.

A mark will not be deducted for a wrong answer. Any rough working should be done in this
booklet.

This question paper consists of 12 printed pages.

Copyright’ Zimbabwe School Examinations Council, N2021

OZIMSEC N2021 [Turn over

UV UTOEONTUTTI IEEE EN

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1,

N

The bar graph shows the variation in mass for a swarm of locusts.

10 1 =e +
| | | |
nab pe
| ||
| |
number
0 4 Sra Sono Careers
locusts |
5 ==
0 }
10 20 30 40 50

mass of locust /g

What is the total number of locusts?

A 2
B 8
Cc 19

D 50

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The diagram shows a section through a plant root.

Which tissue, A, B, C or D, transports water?

S a B

Osmosis is the movement of water molecules from their region of

A

B
Cc
D

high concentration to low concentration through a fully permeable membrane.
low concentration to high concentration through a fully permeable membrane.
high concentration to low concentration through a selectively permeable
membrane.

low concentration to high concentration through a selectively permeable
membrane.

What is the difference between green plants and animals?

A

B
Cc
D

animals respire but plants do not
plants respire but animals do not
animals manufacture their own food but plants do not
plants manufacture their own food but animals do not

Which are the products of photosynthesis?

A

B
Cc
D

oxygen and water

glucose and oxygen

carbon dioxide and water
glucose and carbon dioxide

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What is produced when proteins are digested?

A amino acids
B fatty acids
Cc glycerol

D maltose

The diagram shows the human respiratory system.

Which part, A, B, C or D, is the alveolus?

Which component of blood carries dissolved nutrients?

plasma

platelets

red blood cells
white blood cells

SaAa>

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9, The diagram shows a bean seed. .

Which part, A, B, C or D, stores food?

10. The diagram shows a flower.

wn

Which parts of the flower make up the stamen?

A I and 2
B 3 and 4
Cc 3 and 5
D l and 5

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11.

13.

16,

Personal hygiene involves

A covering one's food.

B brushing one’s teeth.
Cc cleaning one's room daily.
D keeping active through exercise.

Which one is not an advantage of biodiversity in a natural ecosystem?

A interdependence

B more disease spreading

Cc wide variety of food

D self sustenance of an ecosystem

Which organ produces sperms?

A the testis

B the penis

Cc the epididymis

D the prostate gland

Which stage of the mosquito life cycle is controlled by spraying insecticides?

A egg

B pupa
Cc larva
D adult

Which one is an application of filtration?

grain separation

salting peanuts

treatment of water
formation of sugar crystals

Sac

Which characteristic increases when more salt is dissolved in a fixed volume of water?

solubility
concentration
volume of solvent
colour of solvent

Saxe

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17.

18,

19.

20,

SaaS

The diagram shows the changes of state.

Which change of state, A, B, C or D, occurs when iodine crystals are heated?

Magnesium and calcium are in Group II of the Periodic Table.
They have the same number of
A protons.

neutrons.

B
Cc electron shells.
D valency electrons.

What is electrolysis?

A breaking down of an ionic compound using electricity
B breaking down of a covalent compound using electricity
Cc breaking down of an ionic compound using heat

D breaking down of a covalent compound using heat

The reaction between sodium and hydrochloric acid produces a salt and

A hydrogen.
B oxygen.
Cc chlorine.
D water.

Iron rusts in the presence of moisture and

argon.
oxygen.
nitrogen.
hydrogen.

4003/1 N2021

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22.

23.

24.

25.

26.

Zine oxide and sulphuric acid react according to the equation:
ZnO + H,S0, a ZnSO, + H,0

What type of reaction is shown by the equation?

A addition

B condensation
Cc elimination
D neutralisation

Which one is a use of sulphuric acid?

A manufacture of ammonia

B nitric acid production

Cc manufacture of household cleaners

D cleaning materials before electroplating

Which substance is reacted with sodium hydroxide to form soap?

A water

B fatty acids

Cc sodium chloride
D amino acids

Which one is an equation for the production of biogas?

fermentation
-—

A methane + carbon dioxide organic waste

hee ntation ‘
B carbon dioxide + water + energy dermentabiag, organic waste
: fermentaiton ee
Cc organic waste ~———_, methane + carbon dioxide
> fermentation net
D organic waste ~~ carbon dioxide + water + energy

Which one is not an effect of burning fuels?

A afforestation

B pollution

Cc acid rain

D global warming

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27.

28.

29,

Which molecular formula represents ethanol?

eee
H H
B ws Tee
hon
HD
cet on
hon
H H 4H
peed —d on
hohod
A metre has
A 10mm.
B 100 mm.

Cc 1 000 mm.
D 10 000 mm.

How can overheating of cables in a circuit be prevented?

A by using thicker insulations on the wires

B by not switching off a circuit with wet hands
C by using correct wire ratings

D by using thinner wires

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30. The diagram shows an electric circuit.

Fig

What is the total resistance in the circuit?

22
4Q
82
10 2

STARS

31. Three forces act on a box as shown in the diagram.

F

20N

200N

HM Nay

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32.

33.

34,

35.

36.

What is the least force required to pull the box in the direction of force F?

A 21N
B 180 N
Cc 200 N
D 221N

Which energy changes occur when a stone falls from the top of a mountain to the
ground?

kinetic — gravitational potential —+ sound

gravitational potential ——> kinetic —* sound
kinetic —— sound —~ gravitational potential
gravitational potential ——? sound —~ kinetic

Toki

Which one is not an effect of a force on an object?

A change in speed

B change in shape
Cc change in mass
D change in acceleration

What happens when a charged polythene ball is brought near an uncharged polythene
ball?

A there is no effect

B the balls attract

Cc the balls repel

D the balls first repel and then attract

Moment of a force is defined as

A force x perpendicular distance from pivot.
B force + perpendicular distance from pivot.
Cc mass x perpendicular distance from pivot.
D mass > perpendicular distance from pivot.

In which direction does a freely suspended bar magnet rest?

East - West
North - South
North - West
South - East

UNS

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37.

38.

39.

40.

What is current?

A the flow of atoms from positive to negative
B the flow of atoms from negative to positive
Cc the flow of charges from positive to negative
D the flow of charges from negative to positive

Which factor does not influence the reliability of wireless phone communication?

A physical obstacles

B interference or noise

Cc size of cell phone

D proximity of phone to base station

The unit cost of electricity is 20 cents. A family pays $50.00 per month for electricity.
How many kWh of electricity does the family use per month?

A 2.5 kWh

B 10.0 kWh

Cc 250.0 kWh

D 1000.0 kWh

Heat travels in solids through

A conduction.
B convection.
Cc radiation.
D reflection.

A Ae

4003/1 N2021

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