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ZIMSEC O Level · 4003/1 · J2024

Combined Science Paper 1 June 2024

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
The diagram shows a palisade cell.
The function of part X is to
  1. Atrap sunlight.
  2. Bmaintain the shape of the cell.
  3. Ccontrol the activities of the cell.
  4. Dallow substances in and out of the cell.

Question 2

Biology
The diagram shows a food web.
Which organism is a secondary consumer?
  1. Agrass
  2. Bgoat
  3. Cfrog
  4. Drabbit

Question 3

Biology
Which human characteristic shows discontinuous variation?
  1. Asex
  2. Bmass
  3. Cheight
  4. Dfoot length

Question 4

Biology
During digestion, the enzyme amylase converts
  1. Aprotein to amino acids.
  2. Bstarch to glycogen.
  3. Cstarch to maltose.
  4. Dfats to fatty acids and glycerol.

Question 5

Biology
Kwashiorkor is a deficiency disease caused by lack of
  1. Afats.
  2. Bproteins.
  3. Cvitamins.
  4. Dcarbohydrates.

Question 6

Biology
An experiment was set up to investigate a factor of photosynthesis as shown in the diagram.
What is the function of the sodium hydroxide in the experiment?
  1. Ato release oxygen
  2. Bto absorb oxygen
  3. Cto absorb carbon dioxide
  4. Dto release carbon dioxide

Question 7

Biology
The diagram shows part of the human respiratory system.
In which part, A, B, C or D, does gaseous exchange take place?
  1. AA
  2. BB
  3. CC
  4. DD

Question 8

Biology
Blood capillaries have
  1. Avalves.
  2. Bvery large lumen.
  3. Cwalls that are one cell thick.
  4. Dmuscle layers which are very thick.

Question 9

Biology
Which component of blood carries hormones around the body?
  1. Aplasma
  2. Bplatelets
  3. Cred blood cells
  4. Dwhite blood cells

Question 10

Biology
The diagram shows the general structure of a flower.
Which part, A, B, C or D, develops into a fruit after fertilisation?
  1. AA
  2. BB
  3. CC
  4. DD

Question 11

Biology
The diagram shows the male reproductive system.
Which part, A, B, C or D, is cut or tied during sterilisation?
  1. AA
  2. BB
  3. CC
  4. DD

Question 12

Biology
The diagram shows a process in human reproduction.
Which process is shown?
  1. Aovulation
  2. Bmenstruation
  3. Cimplantation
  4. Dfertilisation

Question 13

Biology
Which disease is caused by bacteria?
  1. Amalaria
  2. Bbilharzia
  3. Csyphilis
  4. Dgenital herpes

Question 14

Biology
Vomiting, diarrhoea and abdominal pains are signs and symptoms of
  1. Ascurvy.
  2. Bcholera.
  3. Caenamia.
  4. Dgonorrhoea.

Question 15

Chemistry
The diagram shows a method of separating dyes.
The method of separation shown in the diagram is
  1. Afiltration.
  2. Bdistillation.
  3. Cevaporation.
  4. Dchromatography.

Question 16

Chemistry
Which substance is a mixture?
  1. Aair
  2. Boxygen
  3. Cmagnesium
  4. Dmagnesium oxide

Question 17

Chemistry
One mole of hydrogen and one mole of sodium chloride have the same number of
  1. Aneutrons.
  2. Belectrons.
  3. Cprotons.
  4. Dparticles.

Question 18

Chemistry
An organic compound contains 84% carbon (C) and 16% hydrogen (H) by mass.
What is the empirical formula of the organic compound?
[Atomic mass of carbon is 12 and that of hydrogen is 1]
  1. ACH
  2. BCH2CH_2
  3. CC12HC_{12}H
  4. DC7H16C_7H_{16}

Question 19

Chemistry
Which process is used to manufacture ammonium nitrate fertiliser from ammonia?
  1. Areduction
  2. Bdistillation
  3. Celectrolysis
  4. Dneutralisation

Question 20

Chemistry
Lemon juice is considered to be a weak acid.
Which observations, with litmus paper, shows that lemon juice is an acid?
  1. Ablue litmus remains blue, red litmus remains red
  2. Bblue litmus turns red, red litmus remains red
  3. Cblue litmus remains blue, red litmus turns blue
  4. Dblue litmus bleaches, red litmus bleaches

Question 21

Chemistry
The diagram shows a reaction of dilute hydrochloric acid with substance X to produce a magnesium salt.
Substance X is
  1. Amagnesium.
  2. Bmagnesium oxide.
  3. Cmagnesium chloride.
  4. Dmagnesium hydroxide.

Question 22

Chemistry
The flow diagram shows the stages involved in the separation of the gases in air.
Which gas is collected as a liquid at a temperature of -183 °C by the fractional distillation process?
  1. Ahydrogen
  2. Bnitrogen
  3. Coxygen
  4. Dcarbon dioxide

Question 23

Chemistry
The equation shows the production of sulphur trioxide.
2SO2(g)+O2(g)⇌2SO3(g)2SO_{2(g)} + O_{2(g)} \rightleftharpoons 2SO_{3(g)} ΔH = -98 KJ/mol
The equation shows that the production of sulphur trioxide is
  1. Aan endothermic process.
  2. Ba displacement process.
  3. Ca reduction process.
  4. Dan exothermic process.

Question 24

Chemistry
The diagram shows an experimental set up to investigate conditions necessary for rusting.
Which test tube, A, B, C or D, will have a rusty nail?
  1. AA
  2. BB
  3. CC
  4. DD

Question 25

Chemistry
Which metal is used to galvanise iron?
  1. Atin
  2. Bzinc
  3. Ccopper
  4. Dchromium

Question 26

Chemistry
The diagram shows the preparation of ethanol.
Substance Z is
  1. Awater.
  2. Bglucose solution.
  3. Cdilute sulphuric acid.
  4. Dcalcium carbonate solution.

Question 27

Chemistry
To which homologous series do methane, ethane and propane belong?
  1. Aalkanes
  2. Balkenes
  3. Calcohols
  4. Dcarboxylic acids

Question 28

Physics
The diagram shows a scale on a micrometer screw gauge.
The measurement shown is
  1. A3.30 mm.
  2. B3.50 mm.
  3. C3.80 mm.
  4. D30.0 mm.

Question 29

Physics
Which one is a form of potential energy?
  1. Aheat energy
  2. Blight energy
  3. Celastic energy
  4. Delectrical energy

Question 30

Physics
A force of 20 N is used to push an object of mass 8 kg.
The acceleration of the object is
  1. A0.4 m/s2^2.
  2. B2.5 m/s2^2.
  3. C12.0 m/s2^2.
  4. D160.0 m/s2^2.

Question 31

Physics
The diagrams show the four strokes of a petrol engine but not in sequential order.
In which diagram, A, B, C or D, is chemical energy converted to kinetic energy?
  1. AA
  2. BB
  3. CC
  4. DD

Question 32

Physics
The diagram shows a simple machine.
What is the velocity ratio of the machine?
  1. A0.33
  2. B3.00
  3. C5.00
  4. D10.00

Question 33

Physics
The diagram shows forces acting on an object.
The resultant force is
  1. A10 N.
  2. B20 N.
  3. C30 N.
  4. D200 N.

Question 34

Physics
Which one is the correct formula for calculating pressure?
  1. Aareaforce\frac{\text{area}}{\text{force}}
  2. Bforcearea\frac{\text{force}}{\text{area}}
  3. Cforce × area
  4. Dforce + area

Question 35

Physics
In a hydraulic system, there are two valves, P and Q, as shown in the diagram.
What happens to the valves when piston R moves down?
  1. Avalve P opens, valve Q closes
  2. Bvalve P closes, valve Q closes
  3. Cvalve P opens, valve Q opens
  4. Dvalve P closes, valve Q opens

Question 36

Physics
The total mass of 40 identical seeds is 4.80 g.
What is the mass of one seed?
  1. A0.12 g
  2. B19.20 g
  3. C40.48 g
  4. D83.33 g

Question 37

Physics
Which physical quantity should remain constant when applying Ohm's law?
  1. Apressure
  2. Bvoltage
  3. Ccurrent
  4. Dtemperature

Question 38

Physics
A direct current (d.c) motor converts
  1. Akinetic energy to electrical energy.
  2. Bheat energy to electrical energy.
  3. Celectrical energy to kinetic energy.
  4. Dheat energy to kinetic energy.

Question 39

Physics
Light waves are transmitted inside
  1. Aoptic fibres.
  2. Bcoaxial cables.
  3. Ctwisted wire lines.
  4. Dsheathed pair cables.

Question 40

Physics
An example of an unguided transmission media is
  1. Asheathed pair cables.
  2. Boptic fibre.
  3. Ccoaxial cable.
  4. DWi-Fi.

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