Danho
ZIMSEC O Level · 4003/1 · J2025

Combined Science Paper 1 June 2025

Questions
31 of 40
Syllabus code
4003/1

We hold fewer questions than the paper printed. The rest are not in the bank yet.

Sit this paper online

Questions
31
Pass mark
19
Sit this paper

Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Biology
Which structure is found in both plant and animal cells?
  1. Achloroplast
  2. Bnucleus
  3. Cstarch grain
  4. Dcellulose cell wall

Question 2

Biology
Where does the most transpiration take place in a plant?
  1. Acuticle
  2. Broot hairs
  3. Cstomata
  4. Dxylem

Question 3

Biology
The diagram shows a sketch of the human alimentary canal.
Where does the chemical digestion of proteins begin?
  1. AA
  2. BB
  3. CC
  4. DD

Question 4

Biology
What is the function of the gall bladder?
  1. Aproduction of bile
  2. Babsorption of fats
  3. Cdigestion of fats
  4. Dstorage of bile

Question 5

Biology
Which disease is caused by a deficiency of vitamin A?
  1. Ascurvy
  2. Brickets
  3. Canaemia
  4. Dnight blindness

Question 6

Biology
The diagram shows a transverse section of a dicotyledonous root.
Which part transports water?
  1. AA
  2. BB
  3. CC
  4. DD

Question 7

Biology
Which word equation shows the raw materials and products of photosynthesis?
  1. Aglucose + water → carbon dioxide + water
  2. Bcarbon dioxide + water → glucose + oxygen
  3. Cglucose + oxygen → carbon dioxide + water
  4. Dcarbon dioxide + glucose → water + oxygen

Question 8

Biology
The diagram shows a leaf from a plant kept in the sun for 48 hours.
The leaf was tested for starch using iodine solution.
Which colour was observed on the green part?
  1. Agreen
  2. Bwhite
  3. Cbrown
  4. Dblue-black

Question 9

Biology
The diagram shows a food web.
Which organism is a primary consumer?
  1. Avulture
  2. Bsnake
  3. Chare
  4. Dplant

Question 10

Biology
In the carbon cycle, which process releases carbon into the atmosphere?
  1. Arespiration
  2. Bphotosynthesis
  3. Clightning
  4. Dfeeding

Question 12

Biology
The diagram shows a vertical section through the human heart.
Which arrow, A, B, C or D, shows the movement of oxygenated blood from the lungs.
  1. AA
  2. BB
  3. CC
  4. DD

Question 13

Biology
In which part of the female reproductive system does fertilisation take place?
  1. Aovary
  2. Buterus
  3. Coviduct
  4. Dvagina

Question 15

Chemistry
The diagram shows results of a paper chromatography process for four samples of a chemical substance.
Which sample, A, B C or D, of the chemical substance has two dyes?
  1. AA
  2. BB
  3. CC
  4. DD

Question 16

Chemistry
Element K has an electronic configuration of 2, 8, 6 and element P has an electronic configuration of 2, 8, 2.
Which one is the correct chemical formula of the product of the reaction between K and P?
  1. AKP
  2. BK2_2P
  3. CKP2_2
  4. DK2_2P3_3

Question 18

Chemistry
What is the molecular mass of Ca(OH)2_2?
[Ar of Ca = 40.0, Ar of O = 16.0 and Ar of H = 1.0]
  1. A58.0
  2. B62.0
  3. C74.0
  4. D124.0

Question 19

Chemistry
It took 3 minutes for 5.0 g of copper sulphate granules to completely dissolve in 50 cm3^3 of cold water.
Which condition decreases the time taken for the copper sulphate to completely dissolve?
  1. Adecreasing the volume of the water
  2. Bdecreasing the temperature of the water
  3. Cincreasing the temperature of the water
  4. Dincreasing the size of the copper sulphate granules

Question 20

Chemistry
The Table shows pH values of four solutions, A, B, C and D.
Which solution, A, B, C or D, is alkaline?
  1. AA
  2. BB
  3. CC
  4. DD

Question 22

Chemistry
Which halogen is used to purify water?
  1. Abromine
  2. Bfluorine
  3. Cchlorine
  4. Diodine

Question 23

Chemistry
The diagram shows an electrolytic cell.
Which part, A, B, C or D, is the anode?
  1. AA
  2. BB
  3. CC
  4. DD

Question 24

Chemistry
Which one is a raw material used in the blast furnace during the extraction of iron?
  1. Acoke
  2. Bslag
  3. Ccold air
  4. Dcarbon monoxide

Question 25

Chemistry
Which catalyst is used in the manufacture of sulphuric acid?
  1. Airon
  2. Bplatinum
  3. Crhodium
  4. Dvanadium (V) oxide

Question 26

Chemistry
Which one is a product of the complete combustion of methane, CH4_4?
  1. Aoxygen
  2. Bcarbon soot
  3. Ccarbon dioxide
  4. Dcarbon monoxide

Question 27

Chemistry
A gas is produced during the fermentation of glucose.
How is the gas identified?
  1. Ait relights a glowing splint
  2. Bit changes limewater from clear to milky
  3. Cit gives a pop sound with a burning splint
  4. Dit changes cobalt chloride paper from blue to pink

Question 28

Physics
Which one is a form of potential energy?
  1. Aheat energy
  2. Bsound energy
  3. Ckinetic energy
  4. Dchemical energy

Question 29

Physics
Which statement, on magnetism, is correct?
  1. AAll metals can be magnetised.
  2. BAll non-metals can be magnetised.
  3. CFerromagnetic materials can be magnetised.
  4. DAny electrical conductor can be magnetised.

Question 30

Physics
An irregular stone of mass 80.0 g was lowered into a measuring cylinder containing water. The level of the water in the measuring cylinder rose from 16.0 cm3^3 to 20.0 cm3^3.
What is the density of the stone?
  1. A0.05 g/cm3^3
  2. B4.0 g/cm3^3
  3. C5.0 g/cm3^3
  4. D20.0 g/cm3^3

Question 31

Physics
The diagram shows a stroke of an engine.
Which stroke is shown?
  1. Acompression
  2. Bpower
  3. Cintake
  4. Dexhaust

Question 32

Physics
What is inertia?
  1. Athe weight of a body
  2. Bthe momentum of a body
  3. Cthe body's reaction to external force
  4. Dthe reluctance of a body to change its state of rest or its velocity

Question 35

Physics
What is the unit for work done?
  1. Awatt
  2. Bohm
  3. Cjoule
  4. Dnewton

Question 36

Physics
The unit pascal can be expressed as
  1. AN/m
  2. BN/m2^2
  3. Cm/N
  4. Dm2^2/N

Question 38

Physics
The diagram shows a lift pump.
What happens to the valves Y and Z during the upward stroke?
  1. Avalve Z opens, valve Y closes
  2. Bvalve Y opens, valve Z closes
  3. Cboth valves open
  4. Dboth valves close

More sittings of this paper

The answers, and why they are the answers

Sit the paper here to see which ones you got right. Danho explains every question, keeps your score, and works without a connection.

Get it on Google PlayDownload on the App Store