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ZIMSEC O Level · 4003/1

Combined Science Paper 1 Specimen 2018

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 instrument is most suitable for observing specialised cells?
  1. Amicroscope
  2. Btelescope
  3. Cbioviewer
  4. Dmagnifying lens

Question 2

Biology

The diagram shows a specialised cell.

What is the name of the cell?

  1. Amuscle cell
  2. Bpalisade cell
  3. Croot hair cell
  4. Dred blood cell

Question 3

Biology
Which adaptation of a leaf does not increase the rate of photosynthesis?
  1. Aair spaces
  2. Bthick cuticle
  3. Cnumerous stomata
  4. Dlarge surface area

Question 4

Biology
Which atmospheric condition reduces the rate of water uptake in plants?
  1. Ahigh humidity
  2. Bhigh wind speed
  3. Chigh temperature
  4. Dhigh light intensity

Question 5

Biology
A wind pollinated flower
  1. Ahas short filaments.
  2. Bhas large petals.
  3. Chas numerous pollen grains.
  4. Dproduces nectar.

Question 6

Biology
Ebola is caused by a
  1. Abacterium.
  2. Bfungus.
  3. Cprotozoan.
  4. Dvirus.

Question 7

Biology
Excessive consumption of alcohol leads to
  1. Aemphysema.
  2. Bhallucinations.
  3. Clung cancer.
  4. Dliver cirrhosis.

Question 8

Biology
Which deficiency disease is caused by lack of Vitamin C?
  1. Agoitre
  2. Bscurvy
  3. Canaemia
  4. Drickets

Question 9

Biology

A student carried out a test on a food substance using the Biuret solution and a purple colour was observed.

Which nutrient was present in the food substance?

  1. Afats
  2. Bproteins
  3. Cvitamins
  4. Dcarbohydrates

Question 10

Biology
Which is a function of the white blood cells?
  1. Adefence
  2. Bexcretion
  3. Ctransport
  4. Dhomeostasis

Question 11

Biology
Which contraceptive method prevents ovulation?
  1. Apill
  2. Bspermicides
  3. Csterilization
  4. Dintra uterine device

Question 12

Biology
Which event will result in a child acquiring active immunity?
  1. Akeeping the child away from sick people
  2. Binjection the child with artificial hormones
  3. Cinjection the child with a vaccine
  4. Dbreastfeeding the child for at least six months

Question 13

Biology
What happens to most of the energy as it flows through an ecosystem?
  1. AIt is recycled.
  2. BIt is lost as heat.
  3. CIt is used in digestion.
  4. DIt is stored as carbohydrates.

Question 14

Chemistry
The physical property used in fractional distillation is the difference in
  1. Adensities of the liquids.
  2. Bboiling points of the liquids.
  3. Cmelting points of the liquids.
  4. Dheat capacities of the liquids.

Question 15

Chemistry
1735Cl^{35}_{17}Cl and 1737Cl^{37}_{17}Cl are called
  1. Aisomers.
  2. Bisotopes.
  3. Cmonomers.
  4. Dpolymers.

Question 16

Chemistry

The diagram show the outermost shell of element Z.

Z forms an ion with a charge of

  1. AZ6+Z^{6+}.
  2. BZ2+Z^{2+}.
  3. CZ6−Z^{6-}.
  4. DZ2−Z^{2-}.

Question 17

Chemistry

Sulphuric acid and calcium hydroxide reacts as shown by the equation:

H2SO4(aq)+Ca(OH)2(aq)→CaSO4(aq)+2H2O(l)H_2SO_{4(aq)} + Ca(OH)_{2(aq)} \rightarrow CaSO_{4(aq)} + 2H_2O_{(l)}

If 0.1 moles of sulphuric acid are used, how many moles of water are produced?

  1. A0.1
  2. B0.2
  3. C1.0
  4. D2.0

Question 18

Chemistry

An organic compound contains 84 % carbon(C) and 16 % hydrogen (H) by mass.
[atomic mass of C is 12 and that of H is 1]

What is the empirical formula of the organic compound?

  1. ACH
  2. BCH2CH_2
  3. CC2HC_2H
  4. DC2H4C_2H_4

Question 19

Chemistry
Which substance, in exhaust fumes, causes global warming?
  1. Acarbon soot
  2. Bcarbon dioxide
  3. Cwater vapour
  4. Dcarbon monoxide

Question 20

Chemistry
What is the use of limestone in the blast furnace?
  1. Ato produce slag
  2. Bto act as a fuel
  3. Cto produce carbon monoxide
  4. Dto reduce iron (III) oxide to iron

Question 21

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

Question 22

Chemistry

The list shows part of the reactivity series of metals:

calcium
magnesium
zinc
copper

What is the position of a metal that reacts vigorously with cold water?

  1. Abelow copper
  2. Babove calcium
  3. Cbetween zinc and copper
  4. Dbetween magnesium and zinc

Question 23

Chemistry
Which temperature is used in the Haber process?
  1. A200 °C
  2. B300 °C
  3. C450 °C
  4. D800 °C

Question 24

Chemistry

The equation shows the reaction between iron oxide and carbon monoxide.

iron oxide + carbon monoxide → iron + carbon dioxide

Which is the oxidising agent?

  1. Airon
  2. Biron oxide
  3. Ccarbon dioxide
  4. Dcarbon monoxide

Question 25

Chemistry

The flow diagram shows the manufacture of sulphuric acid.

What is X?

  1. Awater
  2. Bvanadium pentoxide
  3. Cdilute sulphuric acid
  4. Dconcentrated sulphuric acid

Question 26

Chemistry

The diagram shows the structure of an organic molecule.

To which homologous series does the molecule belong?

  1. Aalcohols
  2. Baldehydes
  3. Calkanes
  4. Dalkenes

Question 27

Physics
Which instrument would be used to accurately measure the internal diameter of a glass bottle?
  1. Ametre rule
  2. Bvernier callipers
  3. Ctape measure
  4. Dmicrometer screw gauge

Question 28

Physics
Weight can be calculated by multiplying acceleration due to gravity by
  1. Amass.
  2. Bvelocity.
  3. Ctime.
  4. Ddistance.

Question 29

Physics

The diagram shows a pulley system.

What is the velocity ratio (VR) of the pulley system?

  1. A1
  2. B2
  3. C3
  4. D4

Question 30

Physics

The diagrams show the four strokes of a petrol engine.

Which diagram, A, B, C or D, shows the inlet stroke?

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

Question 31

Physics

The diagram shows a simple direct current (d.c) electric motor.

Which part, A, B, C or D, is the commutator?

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

Question 32

Physics
Which circuit diagram, A, B, C or D, can be used to determine the resistance of a resistor, R?
  1. AA
  2. BB
  3. CC
  4. DD

Question 33

Physics

The pie chart shows components X, Y and Z which are in a mixture.

What is the percentage of Z in the mixture?

  1. A8%
  2. B16%
  3. C25%
  4. D75%

Question 34

Physics

A wind blows with a force of 200 N against a wall of height 2 m and length 5 m.

What is the pressure exerted on the wall by the wind?

  1. A20 N/m2^2
  2. B40 N/m2^2
  3. C100 N/m2^2
  4. D200 N/m2^2

Question 35

Physics

The diagram shows a manometer used to measure gas pressure.

[Acceleration due to gravity is g, density of liquid is ρ.]

Which expression gives the gas pressure, G?

  1. AG=P−ρghG = P - \rho gh
  2. BG=P+ρghG = P + \rho gh
  3. CG=ρgh−PG = \rho gh - P
  4. DG=ρghG = \rho gh

Question 36

Physics
Why does a solar cooker have a shiny surface?
  1. Ato reflect heat
  2. Bto conduct heat
  3. Cto absorb heat
  4. Dto concentrate heat

Question 37

Physics
Which media of communication is used to share pictures using cell phones?
  1. Acoaxial cable
  2. Boptic fibre
  3. Csheathed pair cables
  4. Dwi-fi

Question 38

Physics

The diagram shows a 3-pin plug.

What is the standard colour of wire Y?

  1. Agreen-yellow
  2. Bblue
  3. Cblack
  4. Dbrown

Question 39

Physics
What is the energy conversion in a generator?
  1. Aelectrical energy → kinetic energy
  2. Belectrical energy → mechanical energy
  3. Cmechanical energy → electrical energy
  4. Dmechanical energy → potential energy

Question 40

Physics

Electricity costs 10 cents per kilowatt hour (kWh).

How much does it cost to run a 0.75 kw machine for 20 hours?

  1. A$0.375
  2. B$1.50
  3. C$7.50
  4. D$15.00

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