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ZIMSEC O Level · 4003/1 · N2023

Combined Science Paper 1 November 2023

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 part of a cell contains the genetic material?
  1. Anucleus
  2. Bcytoplasm
  3. Ccell wall
  4. Dcell membrane

Question 2

Biology
Which factor increases the rate of transpiration?
  1. Ahigh humidity
  2. Blow temperature
  3. Chigh wind speed
  4. Dlow light intensity

Question 3

Biology
Which condition is necessary for seeds to germinate?
  1. Apresence of soil
  2. Bpresence of light
  3. Cpresence of oxygen
  4. Dpresence of carbon dioxide

Question 4

Biology

The diagram shows the internal structure of a leaf.

What is part P?

  1. Achloroplast
  2. Bpalisade
  3. Cepidermis
  4. Dguard cell

Question 5

Biology
Chewing is important for
  1. Astimulating the taste buds.
  2. Bimproving the taste of food.
  3. Ckilling the micro-organisms in food.
  4. Dincreasing the surface area of food.

Question 6

Biology
Typhoid is caused by
  1. Afungi.
  2. Bviruses.
  3. Cbacteria.
  4. Dprotozoa.

Question 7

Biology

The diagram shows part of the nitrogen cycle.

Which arrow, A, B, C or D, represents the first step in nitrification?

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

Question 8

Biology
Which blood vessel transports oxygenated blood to all parts of the body?
  1. Aaorta
  2. Bvena cava
  3. Cpulmonary artery
  4. Dpulmonary vein

Question 9

Biology
Which type of immunity is acquired by infants through breastfeeding?
  1. Aartificial active
  2. Bartificial passive
  3. Cnatural active
  4. Dnatural passive

Question 10

Biology

The diagram shows the female reproductive system.

Where is the intra-uterine device inserted to prevent pregnancy?

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

Question 11

Biology
Which gas changes bicarbonate indicator from red to yellow?
  1. Aoxygen
  2. Bnitrogen
  3. Cwater vapour
  4. Dcarbon dioxide

Question 12

Biology
Which one is the end product of starch digestion?
  1. Aglucose
  2. Bglycerol
  3. Camino acids
  4. Dfatty acids

Question 13

Biology
Which process is responsible for the movement of gases in and out of the alveolus?
  1. Aosmosis
  2. Bdiffusion
  3. Crespiration
  4. Dactive uptake

Question 14

Biology

The diagram shows a Visking tube with solution J placed in a beaker containing solution K.

Which row correctly identifies solutions J and K?

  1. Asolution J: distilled water, solution K: salt solution
  2. Bsolution J: distilled water, solution K: distilled water
  3. Csolution J: salt solution, solution K: salt solution
  4. Dsolution J: salt solution, solution K: distilled water

Question 15

Chemistry

The nuclide notation for an oxygen atom is 816O^{16}_{8}\text{O}.

The electronic configuration for the atom is

  1. A2, 4.
  2. B2, 6.
  3. C2, 8.
  4. D2, 8, 6.

Question 16

Chemistry
The number of particles present in one mole of any substance is the
  1. AAvogadro number.
  2. Belectron number.
  3. Cproton number.
  4. Dmass number.

Question 17

Chemistry
Which statement describes an ionic compound?
  1. AIt conducts electricity when in molten state.
  2. BIt does not dissolve in water.
  3. CIt has low melting and boiling points.
  4. DIt can be attracted by a magnet.

Question 18

Chemistry

The diagram shows a chromatogram obtained by separating dyes X, Y, Z and W.

Which two dyes have the same number of inks?

  1. AX and Y
  2. BX and Z
  3. CY and Z
  4. DZ and W

Question 19

Chemistry
Which one is a property of Group II elements?
  1. Athey are non metals
  2. Bthey are unreactive
  3. Care gases at room temperature
  4. Dthey react with water forming alkaline solutions

Question 20

Chemistry

The diagram shows a pH scale.

Which position, A, B, C or D, represents the pH of water?

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

Question 21

Chemistry

The equation shows a chemical reaction:

2NaOH+H2SO4→Na2SO4+2H2O2\text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}

The equation represents

  1. Aan addition reaction.
  2. Ban oxidation reaction.
  3. Ca metal-acid reaction.
  4. Da neutralisation reaction.

Question 22

Chemistry
Which condition is required for the production of ammonia?
  1. Apressure of 1 atmosphere
  2. Bpresence of platinum catalyst
  3. Ctemperature of 450 °C
  4. Dpresence of vanadium (V) oxide catalyst

Question 23

Chemistry

The diagram shows the electrolysis of molten lead (II) bromide.

Which observation is made at electrode A?

  1. Ait becomes larger
  2. Bit becomes smaller
  3. Cthere is no change
  4. Dbubbles of gas are seen

Question 24

Chemistry
Alloying is used for
  1. Aimproving a metal's properties.
  2. Bmaking the metal more reactive.
  3. Cmaking the metal less toxic.
  4. Dpurifying a metal.

Question 25

Chemistry
Which one is a by-product in the manufacture of soap?
  1. Aoil
  2. Bfatty acid
  3. Cglycerol
  4. Dsodium hydroxide

Question 26

Chemistry
Which equation, A, B, C or D, shows a reaction that occurs in the blast furnace?
  1. Airon + oxygen → iron oxide
  2. Biron + water → iron oxide + hydrogen
  3. Ciron oxide + magnesium → iron + magnesium oxide
  4. Diron oxide + carbon monoxide → iron + carbon dioxide

Question 27

Chemistry

The diagram shows structural formulae of organic compounds.

Which one is the structural formula of ethanol?

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

Question 28

Physics

The bar graph shows variations in mass of seeds.

What is the total number of seeds used?

  1. A5
  2. B10
  3. C40
  4. D50

Question 29

Physics
Heat moves in solids through
  1. Aradiation.
  2. Bconvection.
  3. Cconduction.
  4. Dabsorption .

Question 30

Physics

A bulb lights up when it is connected to a battery.

The energy conversion is

  1. Aelectrical → chemical → heat and light.
  2. Bchemical → electrical → heat and light.
  3. Cchemical → heat and light → electrical.
  4. Delectrical → heat and light → chemical.

Question 31

Physics
Which one is the function of a carburetor?
  1. Aignites the fuel
  2. Bcompresses the air
  3. Cmixes the fuel and air
  4. Dremoves exhaust gases

Question 32

Physics

The diagram shows a simple machine.

What is the velocity ratio (VR) of the machine?

  1. A0.5
  2. B1
  3. C2
  4. D72

Question 33

Physics
The force experienced between a brake shoe and a wheel is
  1. Agravity.
  2. Bfriction.
  3. Cmagnetic.
  4. Delectrostatic.

Question 34

Physics

The diagram shows forces acting on a lever. The lever is balanced.

The force, F, is

  1. A100 N.
  2. B200 N.
  3. C400 N.
  4. D800 N.

Question 35

Physics

The diagram shows a container with water.

At which point, A, B, C or D, is the pressure the least?

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

Question 36

Physics
Which one is a magnetic material?
  1. Airon
  2. Bcopper
  3. Cglass
  4. Dplastic

Question 37

Physics
Which electric symbol, A, B, C or D, represents an ammeter?
  1. AA
  2. BB
  3. CC
  4. DD

Question 38

Physics

The diagram shows an open 3-pin plug.

Part P is the

  1. Afuse.
  2. Blive wire.
  3. Cearth wire.
  4. Dneutral wire.

Question 39

Physics

The diagram shows part of an alternating current (a.c) generator.

What must be connected to B?

  1. Ahandle
  2. Bslip rings
  3. Csplit rings
  4. DA.C supply

Question 40

Physics
Which one is a media for signal transmission?
  1. Ae-mail
  2. Bdecoder
  3. Ccell phone
  4. Doptic fibre

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