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ZIMSEC O Level · 4003/1 · N2024

Combined Science Paper 1 November 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
Which one is an example of an artificial ecosystem?
  1. Apond
  2. Bsea
  3. Cdesert
  4. Driver

Question 2

Biology

The diagram shows the carbon cycle.

Which process, A, B, C or D, leads to global warming?

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

Question 3

Biology
The function of vitamin A is to
  1. Ahelp improve vision.
  2. Bstrengthen teeth and bones.
  3. Cboost the immune system.
  4. Drelease energy from the cells.

Question 4

Biology

The diagrams show different types of teeth.

Which tooth, A, B, C or D, is used for cutting food into smaller pieces?

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

Question 5

Biology
Which substance builds up in a muscle during anaerobic respiration?
  1. Aoxygen
  2. Bethanol
  3. Clactic acid
  4. Dcarbon dioxide

Question 6

Biology

The diagram shows an experimental set up to measure the rate of transpiration.

The apparatus represents a

  1. Abarometer.
  2. Bmanometer.
  3. Cpotometer.
  4. Dmicrometer.

Question 7

Biology
The diagram shows the structure of a heart.
Which blood vessel, A, B, C or D, receives oxygenated blood from the lungs?
  1. AA
  2. BB
  3. CC
  4. DD

Question 8

Biology
Which one is a characteristic of a wind pollinated flower?
  1. Astrong scent
  2. Bbright petals
  3. Csweet nectar
  4. Dfeathery stigma

Question 9

Biology

The diagram shows a germinating bean seed.

Which part, A, B, C or D, develops into a root?

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

Question 10

Biology

The diagram shows the structure of a sperm cell.

Which part, A, B, C or D, supplies the energy needed by the sperm for movement?

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

Question 11

Biology
Which method of contraception prevents implantation of the fertilised egg?
  1. Asterilisation
  2. Buse of spermicides
  3. CIntra-uterine device
  4. Duse of a contraceptive pill

Question 12

Biology

The diagram shows the male reproductive system.

In which part, A, B, C or D, are sperms produced?

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

Question 13

Biology
Which one is a sign/symptom of genital herpes?
  1. Ainsanity
  2. Bkidney damage
  3. Cyellow discharge of pus
  4. Dsmall blisters on the genitals

Question 14

Biology

The diagram shows the life cycle of the malaria parasite.

At which stage, A, B, C or D, is fever experienced?

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

Question 15

Chemistry
A mixture of water and alcohol is separated by fractional distillation because water and alcohol have different
  1. Adensities.
  2. Bsolubilities.
  3. Cboiling points.
  4. Dmelting points.

Question 16

Chemistry
The mass number of an element is the
  1. Anumber of protons.
  2. Bnumber of electrons.
  3. Csum of protons and neutrons.
  4. Dsum of protons and electrons.

Question 17

Chemistry

Chlorine exists as two atoms, 1735Cl^{35}_{17}Cl and 1737Cl^{37}_{17}Cl

Which statement, about the two chlorine atoms, is correct?

  1. AThe atoms form solid molecules at room temperature.
  2. BThe atoms have similar chemical reactions.
  3. CThe atoms have similar number of neutrons.
  4. DThe atoms can be separated by chemical reactions.

Question 18

Chemistry
Which statement, about properties of Group II elements, is correct?
  1. AThey react by gaining electrons.
  2. BReactivity decreases down the group.
  3. CThe atomic radius increases down the group.
  4. DThey react with water to form acidic solutions.

Question 19

Chemistry
Which gas is produced when aluminium reacts with steam?
  1. Aoxygen
  2. Bnitrogen
  3. Chydrogen
  4. Dcarbon dioxide

Question 20

Chemistry
Which substance turns blue litmus paper red?
  1. Adistilled water
  2. Bdilute sulphuric acid
  3. Caqueous sodium chloride
  4. Daqueous sodium hydroxide

Question 21

Chemistry
In the contact process, sulphur dioxide is reacted with oxygen to give sulphur trioxide.
Which catalyst is used?
  1. Airon
  2. Bnickel
  3. Cplatinum-rhodium
  4. Dvanadium (V) oxide

Question 22

Chemistry
Which substance is a raw material in the manufacture of ammonium nitrate fertiliser?
  1. Aoxygen
  2. Bammonia
  3. Cnitrogen
  4. Dsulphur dioxide

Question 23

Chemistry

The diagram shows the apparatus used during the electrolysis of water.

Which one is a positive test for gas K?

  1. Aturning limewater milky
  2. Brelighting a glowing splint
  3. Cproducing a popping sound with a lighted splint
  4. Dturning pink cobalt paper to blue

Question 24

Chemistry
Reduction is the
  1. Aloss of electrons.
  2. Bloss of hydrogen.
  3. Cgain of electrons.
  4. Dgain of oxygen.

Question 25

Chemistry
Iron is extracted in the blast furnace.
What is the function of the limestone in the blast furnace?
  1. Ato react with hot air
  2. Bto remove impurities
  3. Cto reduce iron (III) oxide
  4. Dto increase temperature

Question 26

Chemistry

The equation shows a reaction in the biogas digester.

Organic waste →\rightarrow X + carbon dioxide

What is X?

  1. Aethanol
  2. Bmethane
  3. Coxygen
  4. Dethene

Question 27

Chemistry
Which of the organic molecules shown is a hydrocarbon?
  1. AA
  2. BB
  3. CC
  4. DD

Question 28

Physics

The diagram shows a Vernier calipers being used to determine the diameter of a cylindrical rod.

The diameter of the rod is

  1. A1.50 cm.
  2. B2.10 cm.
  3. C2.15 cm.
  4. D8.10 cm.

Question 29

Physics
The density of a stone with a mass of 4 kg and a volume of 2 m3^3 is
  1. A0.5 kg/m3^3.
  2. B2.0 kg/m3^3.
  3. C6.0 kg/m3^3.
  4. D8.0 kg/m3^3.

Question 30

Physics

The diagram shows a stone hung from a tree.

Which type of energy is possessed by the stone?

  1. Amechanical energy
  2. Belectrical energy
  3. Cpotential energy
  4. Delastic energy

Question 31

Physics
The copper plate of a solar water heater is painted black to increase the
  1. Aabsorption of light.
  2. Babsorption of heat.
  3. Creflection of light.
  4. Dreflection of heat.

Question 32

Physics
The function of the fuel injector in a diesel engine is to
  1. Aspray the fuel directly into the cylinder.
  2. Bspray the fuel-air mixture into the cylinder.
  3. Ccontrol the amount of fuel into the inlet valve.
  4. Dcontrol the amount of fuel-air mixture into the cylinder.

Question 33

Physics

The diagram shows a simple machine.

What is the velocity ratio of the machine?

  1. A0.5
  2. B2.0
  3. C12.0
  4. D24.0

Question 34

Physics
Which diagram, A, B, C, or D, correctly represents the effect of depth on the pressure in a liquid?
  1. AA
  2. BB
  3. CC
  4. DD

Question 35

Physics

The diagram shows a lift pump.

What happens to the valves A and B during the down stroke?

  1. Avalve A opens, valve B closes
  2. Bvalve A closes, valve B opens
  3. Cvalve A closes, valve B closes
  4. Dvalve A opens, valve B opens

Question 36

Physics
Magnetic field lines can be demonstrated by using a magnet and
  1. Airon fillings.
  2. Bglass powder.
  3. Ccopper fillings.
  4. Dwood shavings.

Question 37

Physics
Which diagram, A, B, C or D, represents the magnetic field lines of a straight wire current-carrying conductor?
  1. AA
  2. BB
  3. CC
  4. DD

Question 38

Physics
Which equation shows the relationship between voltage (V), current (I) and resistance (R)?
  1. AR=IVR = \frac{I}{V}
  2. BR=VIR = \frac{V}{I}
  3. CR=V2IR = V^2 I
  4. DR=VIR = VI

Question 39

Physics
A short circuit happens when
  1. Aa circuit is too short.
  2. Ban electric current occurs.
  3. Ca switch in a circuit is left open.
  4. Dexcess current passes through a conductor.

Question 40

Physics
Encoding of messages is done by the
  1. AWi-Fi.
  2. Bcables.
  3. Csender.
  4. Dreceiver.

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