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ZIMSEC O Level · 4003/1 · J2020

Combined Science Paper 1 June 2020

Questions
40
Syllabus code
4003/1

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Questions
40
Pass mark
24
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Biology
Which one is a physical component of an ecosystem?
  1. Aair
  2. Bfungi
  3. Chumus
  4. Dbacteria

Question 2

Biology
What is the function of the vacuole in a plant cell?
  1. Astores salts and sugars
  2. Bcontrols the activities of the cell
  3. Cproduces food by photosynthesis
  4. Dcontrols movement of substances in and out of the cell

Question 3

Biology

The equation for anaerobic respiration in muscle cells is given below:

glucose →\rightarrow energy + Q

What is Q?

  1. Acarbon dioxide
  2. Blactic acid
  3. Calcohol
  4. Dwater

Question 4

Biology

The diagram shows part of teeth on the upper jaw of a human being.

The tooth labelled X is

  1. Aa molar.
  2. Ba canine.
  3. Can incisor.
  4. Da premolar.

Question 5

Biology

The diagram shows a stage in the process of testing a leaf for starch.

Why is the stage shown important?

  1. Ato soften the leaf
  2. Bto make the leaf brittle
  3. Cto kill and open up the leaf cells
  4. Dto remove chlorophyll from the leaf

Question 6

Biology

An experiment on germination was carried out by planting 80 seeds and 50 seeds germinated.

What was the percentage germination?

  1. A3080×1001\frac{30}{80} \times \frac{100}{1}
  2. B5080×1001\frac{50}{80} \times \frac{100}{1}
  3. C30100×801\frac{30}{100} \times \frac{80}{1}
  4. D50100×801\frac{50}{100} \times \frac{80}{1}

Question 7

Biology
Where does gaseous exchange occur?
  1. Ain the bronchiole
  2. Bin the bronchus
  3. Cin the trachea
  4. Din the alveoli

Question 8

Biology
Which one is not a function carried out by the blood?
  1. Adefence
  2. Bexcretion
  3. Ctransport
  4. Dhomeostasis

Question 9

Biology
Why is transpiration good for a plant?
  1. AIt helps the plant to take up water and mineral salts.
  2. BIt helps to transport sugars around the plant.
  3. CIt maintains a balance of starch.
  4. DIt keeps the plant cells turgid.

Question 10

Biology

The diagram shows the double blood circulation system in humans.

Which blood vessels are thick walled?

  1. A1 and 2
  2. B1 and 3
  3. C2 and 4
  4. D3 and 4

Question 11

Biology

The diagram shows the structure of a wind pollinated flower.

Which part produces pollen grains?

  1. AA
  2. BB
  3. CC
  4. DD

Question 12

Biology

The diagram shows the transfer of a substance between the placenta and the uterine wall in a pregnant woman.

The substance carried in the direction of the arrows is

  1. Aurea.
  2. Boxygen.
  3. Cglucose.
  4. Dan antibody.

Question 13

Biology

The diagram shows the life cycle of the anopheles mosquito.

Which method can effectively control the mosquito at stage J?

  1. Aspraying with insecticide
  2. Busing mosquito repellents
  3. Ccovering water ponds with oil
  4. Dcutting grass around the home

Question 14

Biology
Active immunity may be developed by
  1. Asuffering and recovering from a disease.
  2. Bbreast feeding for at least six months.
  3. Cavoiding contact with sick people.
  4. Dbeing injected with antibodies.

Question 15

Chemistry
The Avogadro's number is the number of
  1. Aparticles in one mole of a substance.
  2. Bprotons in one mole of a substance.
  3. Celectrons in one mole of a substance.
  4. Dneutrons in one mole of a substance.

Question 16

Chemistry
The two types of sub-atomic particles found in the nucleus are the
  1. Aelectron and proton.
  2. Belectron and neutron.
  3. Cproton and neutron.
  4. Dnucleon and electron.

Question 17

Chemistry

The symbol 818O^{18}_{8}O represents an atom of oxygen.

How many neutrons does the atom have?

  1. A8
  2. B10
  3. C18
  4. D26

Question 18

Chemistry
What is the relative molecular mass of water(H2OH_2O)?
[Ar of H is 1. Ar of O is 16]
  1. A14
  2. B17
  3. C18
  4. D32

Question 19

Chemistry

The diagram shows the type of bonding in a compound, XY.

XY has

  1. Ahydrogen bonding.
  2. Bmetallic bonding.
  3. Ccovalent bonding.
  4. Dionic bonding.

Question 20

Chemistry
Which product is formed when a metal reacts with air?
  1. Aa salt
  2. Ban oxide
  3. Ca carbonate
  4. Da hydroxide

Question 21

Chemistry
The best method of separating a mixture of liquids of different boiling points is
  1. Afiltration.
  2. Bevaporation.
  3. Csimple distillation.
  4. Dfractional distillation.

Question 22

Chemistry
A solution has a pH of 6.
The solution is a
  1. Astrong acid.
  2. Bweak acid.
  3. Cstrong base.
  4. Dweak base.

Question 23

Chemistry
A neutralisation reaction occurs when
  1. Aa salt only is formed.
  2. Bwater only is formed.
  3. Coxidation only occurs.
  4. Dwater and a salt are formed.

Question 24

Chemistry
The production of ammonia requires
  1. Apressure of 200 atm to 300 atm.
  2. Btemperature of 200 °C to 250 °C.
  3. Cvanadium (V) oxide catalyst.
  4. Dsulphur dioxide and oxygen.

Question 25

Chemistry
What type of a reaction occurs when carbon monoxide reacts with iron (III) oxide?
  1. Aoxidation only
  2. Breduction only
  3. Cdecomposition only
  4. Doxidation and reduction

Question 26

Chemistry
Which fuel is a hydrocarbon?
  1. Ahydrogen
  2. Bcoal gas
  3. Cbutane
  4. Dethanol

Question 27

Chemistry

The diagram shows an organic molecule.

The molecule is

  1. Aethane.
  2. Bethene.
  3. Cethanol.
  4. Dpropene.

Question 28

Physics
A possible unit of density is
  1. Acm3^3/g.
  2. Bcm/g3^3.
  3. Cg/cm3^3.
  4. Dg3^3/cm.

Question 29

Physics

The diagram shows a simple machine.

Which type of a simple machine is shown in the diagram?

  1. Agear
  2. Blever
  3. Cpulley
  4. Dinclined plane

Question 30

Physics

An effort of 150 N raises a load of 600 N through a distance of 2 m. The effort moves a distance of 10 m.

What is the efficiency of the system?

  1. A20%
  2. B25%
  3. C75%
  4. D80%

Question 31

Physics
Hydraulic systems are based on the fact that
  1. Aliquids cannot be compressed.
  2. Bliquids flow cannot be stopped.
  3. Cpressure in liquids increases with depth.
  4. Dliquids transmit equal forces in all directions.

Question 32

Physics
Convection takes place in
  1. Agases and solids.
  2. Bgases and liquids.
  3. Cliquids and solids.
  4. Dgases, liquids and solids.

Question 33

Physics
What is the purpose of the curved surface of a solar cooker?
  1. Ato absorb maximum energy from the sun
  2. Bto focus energy from the sun to the pot
  3. Cto reflect heat away from the pot
  4. Dto absorb heat from the pot

Question 34

Physics

The diagram shows a carburettor.

Which part controls the amount of air that mixes with petrol?

  1. AA
  2. BB
  3. CC
  4. DD

Question 35

Physics

Air, with a pressure of 400 Pa, acts on a wall of area 5 m2^2.

What is the force exerted by the air?

  1. A80 N
  2. B395 N
  3. C405 N
  4. D2000 N

Question 36

Physics
The energy change that happens to information before transmission in a cell phone is
  1. Asound to light.
  2. Blight to sound.
  3. Celectrical to sound.
  4. Dsound to electrical.

Question 37

Physics
An electrical appliance with double insulation does not have
  1. Aa neutral wire.
  2. Ban earth wire.
  3. Ca live wire.
  4. Dinsulation.

Question 38

Physics
Which material is used to make a core of an electromagnet?
  1. Airon
  2. Bsteel
  3. Ccopper
  4. Daluminium

Question 39

Physics

The diagram shows an alternating current generator.

Which component allows current to change direction?

  1. AA
  2. BB
  3. CC
  4. DD

Question 40

Physics
Which graph shows the relationship between voltage (V) and current (I) in a pure metal?
  1. AA
  2. BB
  3. CC
  4. DD

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