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ZIMSEC O Level · 4003/1 · J2023

Combined Science Paper 1 June 2023

Questions
39 of 40
Syllabus code
4003/1

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Questions
39
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 part of a cell is found in both plant and animal cells?
  1. Acell membrane
  2. Bvacuole
  3. Ccell sap
  4. Dcell wall

Question 2

Biology

The diagram shows the internal structure of the root of a dicotyledonous plant.

Part X is the

  1. Acortex.
  2. Bxylem.
  3. Cphloem.
  4. Depidermis.

Question 3

Biology
A manual worker's diet must contain a higher proportion of
  1. Afibre.
  2. Biodine.
  3. Cvitamin D.
  4. Dcarbohydrates.

Question 4

Biology

In an ecosystem, a zebra feeds on grass, a lion feeds on the zebra and a vulture feeds on the lion.

The lion is a

  1. Aproducer.
  2. Bprimary consumer.
  3. Csecondary consumer.
  4. Dtertiary consumer.

Question 5

Biology

The diagram shows part of the human digestive system.

What is labelled A?

  1. Athe stomach
  2. Bthe pancreas
  3. Cthe large intestine
  4. Dthe small intestine

Question 6

Biology
The rate of transpiration is measured by a
  1. Abarometer.
  2. Bmanometer.
  3. Cmicrometer.
  4. Dpotometer.

Question 7

Biology

The diagram shows a flower.

Which part, A, B, C or D, develops into a fruit after fertilisation?

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

Question 8

Biology

A farmer planted 30 bean seeds and 12 seeds did not germinate.

What was the percentage germination?

  1. A18%
  2. B40%
  3. C42%
  4. D60%

Question 9

Biology
Which characteristic, in humans, shows continuous variation?
  1. Asex
  2. Bheight
  3. Ctongue rolling
  4. Dleft or right handedness

Question 10

Biology
Which part of the male reproductive system carries urine and semen out of the body through the penis?
  1. Ascrotum.
  2. Burethra.
  3. Csperm duct.
  4. Depididymis.

Question 11

Biology
Which organism causes genital herpes?
  1. Afungi
  2. Bvirus
  3. Cbacterium
  4. Dprotozoan

Question 12

Biology
Which blood vessel transports deoxygenated blood to the lungs?
  1. Avena cava
  2. Bpulmonary artery
  3. Cpulmonary vein
  4. Daorta

Question 13

Biology
Aerobic respiration takes place in the
  1. Anucleus.
  2. Bvacuole.
  3. Cchloroplast.
  4. Dmitochondria.

Question 14

Biology

A food sample was mixed with Benedict's solution in a test tube. The test tube was placed into a hot water bath. The solution changed from blue to brick-red.

The food sample contained

  1. Astarch.
  2. Bglucose.
  3. Cprotein.
  4. Dmaltose.

Question 15

Chemistry
Which method is used to separate an insoluble solid from a liquid?
  1. Afiltration
  2. Bmagnetism
  3. Cdistillation
  4. Devaporation

Question 16

Chemistry

The the mass number and the proton number of an element X is shown below.

3581X^{81}_{35}X

How many neutrons are there in an atom of element X?

  1. A35
  2. B46
  3. C81
  4. D116

Question 17

Chemistry

The diagram shows bonding in a compound formed between elements M and N.

In which Group of the Periodic Table is element N found?

  1. AI
  2. BII
  3. CVI
  4. DVIII

Question 18

Chemistry

How many moles are present in 6 grams of carbon?

[mass number of carbon = 12; atomic number of carbon = 6]

  1. A0.5
  2. B1.0
  3. C12.0
  4. D6.0×10236.0 \times 10^{23}

Question 19

Chemistry
A metal reacts with steam to produce hydrogen and a
  1. Ametal oxide.
  2. Bmetal salt.
  3. Cmetal chloride.
  4. Dmetal hydroxide.

Question 20

Chemistry

A stage in the manufacture of sulphuric acid is shown by the equation:

2SO2(g)+O2(g)⇌2SO3(g)2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g) ΔH=−94\Delta H = -94 kJ/ mol

The sign ⇌\rightleftharpoons shows that the reaction is

  1. Aan endothermic reaction.
  2. Ba reversible reaction.
  3. Can exothermic reaction.
  4. Dan oxidation reaction.

Question 21

Chemistry
Oxygen is separated from nitrogen by fractional distillation because
  1. Anitrogen makes 78% of the air.
  2. Boxygen is denser than nitrogen.
  3. Cnitrogen is an inert element.
  4. Dof their different boiling points.

Question 22

Chemistry

The diagram shows a method used to decorate a ring.

The method used is

  1. Aalloying.
  2. Bpainting.
  3. Cgalvanising.
  4. Delectroplating.

Question 23

Chemistry

A salt can be prepared by adding an acid slowly using a burette to a conical flask wich contains an indicator and sodium hydroxide.

The method used is

  1. Atitration.
  2. Bfiltration.
  3. Cdistillation.
  4. Dfractional distillation.

Question 24

Chemistry
Which reaction, in the blast furnace, shows the formation of slag?
  1. ACaCO3→CaO+CO2CaCO_3 \rightarrow CaO + CO_2
  2. BCO2+C→2COCO_2 + C \rightarrow 2CO
  3. CFe2O3+3C→2Fe+3COFe_2O_3 + 3C \rightarrow 2Fe + 3CO
  4. DCaO+SiO2→CaSiO3CaO + SiO_2 \rightarrow CaSiO_3

Question 25

Chemistry
Which diagram, A, B, C or D, shows the structure of ethene?
  1. AA
  2. BB
  3. CC
  4. DD

Question 26

Chemistry
Which statement, about halogens, is correct?
  1. AThey are all gases.
  2. BThey are poor oxidising agents.
  3. CTheir reactivity increases down the Group.
  4. DThey have seven electrons in the outer shell.

Question 27

Chemistry
Which process is used to produce the hydrogen gas needed for the Haber process?
  1. Aroasting
  2. Breduction
  3. Celectrolysis
  4. Dfractional distillation

Question 28

Physics
The SI unit of mass is the
  1. Ametre.
  2. Bgram.
  3. Cnewton.
  4. Dkilogram.

Question 29

Physics
The relationship between mass (m), volume (V) and density (ρ\rho) of a substance is expressed as
  1. Aρ=Vm\rho = \frac{V}{m}
  2. Bρ=mV\rho = \frac{m}{V}
  3. Cρ=m−V\rho = m - V
  4. Dρ=V−m\rho = V - m

Question 30

Physics
Which pair of physical quantities correctly defines weight and mass?
  1. Aweight: scalar; mass: vector
  2. Bweight: vector; mass: vector
  3. Cweight: vector; mass: scalar
  4. Dweight: scalar; mass: scalar

Question 31

Physics

The diagram shows a stone resting on a table.

Which principle of Newton's laws of motion is shown by the diagram?

  1. Aweight is equivalent to mass and velocity
  2. Baction and reaction are equal and opposite
  3. Ca body remains at rest or in motion unless acted upon by an external force
  4. Dacceleration of a mass is proportional to the force provided the mass is constant

Question 32

Physics
Shiny surfaces are
  1. Apoor absorbers of heat.
  2. Bpoor reflectors of heat.
  3. Cgood emitters of heat.
  4. Dgood absorbers of heat.

Question 33

Physics
Which row one, A, B, C or D, correctly describes the events for the compression stroke of a four stroke engine?
  1. Apiston direction: up; inlet valve: closed; exhaust valve: closed
  2. Bpiston direction: down; inlet valve: open; exhaust valve: open
  3. Cpiston direction: up; inlet valve: open; exhaust valve: open
  4. Dpiston direction: down; inlet valve: closed; exhaust valve: closed

Question 34

Physics

The diagram shows an object pulled along a 3 m horizontal surface.

What is the energy used?

  1. A0.1 J
  2. B10.0 J
  3. C33.0 J
  4. D90.0 J

Question 35

Physics

The diagram shows a simple machine.

What is the mechanical advantage of the machine?

  1. A0.5
  2. B2.0
  3. C20.0
  4. D60.0

Question 36

Physics
Decoding of information is done by a
  1. Acable.
  2. Bsender.
  3. Creceiver.
  4. Dtransmission media.

Question 37

Physics
Fluid pressure is measured by a
  1. Avoltmeter.
  2. Bmanometer.
  3. Cmicrometer.
  4. Da photometer.

Question 38

Physics

The diagram shows two balloons, X and Y, being brought closer to each other. The balloons repel each other.

Which are the possible charges on the balloons?

  1. Aboth are neutral
  2. Bboth are positively charged
  3. CX is positively charged and Y is negatively charged
  4. DX is negatively charged and Y is positively charged

Question 40

Physics

The diagram shows an electric circuit.

What is the resistance of the circuit?

  1. A2.0 Ω\Omega
  2. B6.0 Ω\Omega
  3. C12.0 Ω\Omega
  4. D24.0 Ω\Omega

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