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ZIMSEC O Level · 4003/1 · N2022

Combined Science Paper 1 November 2022

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

The diagram shows a plant cell.

Which part controls the activities of the cell?

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

Question 2

Biology
Potato strips left in a strong sugar solution become plasmolysed because they
  1. Again water by osmosis.
  2. Blose water by osmosis.
  3. Cgain sugar molecules by diffusion.
  4. Dlose sugar molecules by diffusion.

Question 3

Biology
By which process do mineral ions enter into root hair cells?
  1. Aosmosis
  2. Bdiffusion
  3. Crespiration
  4. Dactive uptake

Question 4

Biology
Which equation represents photosynthesis?
  1. Acarbon dioxide + oxygen + energy →\rightarrow glucose + water
  2. Bglucose + water + energy →\rightarrow carbon dioxide + oxygen
  3. Ccarbon dioxide + water + energy →\rightarrow glucose + oxygen
  4. Dglucose + oxygen + energy →\rightarrow carbon dioxide + water

Question 5

Biology

The diagram shows a set of apparatus which was assembled in a laboratory.

What does the set of apparatus measure?

  1. Arate of evaporation
  2. Brate of transpiration
  3. Crate of photosynthesis
  4. Drate of osmosis

Question 6

Biology
Which part of the respiratory system is involved in gaseous exchange?
  1. Anostril
  2. Btrachea
  3. Cbronchus
  4. Dalveolus

Question 7

Biology
What is the importance of carbohydrates in a diet?
  1. Afor energy
  2. Bfor growth
  3. Cfor defence
  4. Dfor strong bones

Question 8

Biology
What is the purpose of mechanical digestion?
  1. Aincreases surface area of food for enzyme action
  2. Bconverts food from soluble to insoluble molecules
  3. Cmakes food in the mouth to stick together
  4. Dproduces salivary amylase

Question 9

Biology
Which one is not a function of blood?
  1. Adefence
  2. Bexcretion
  3. Ctransport
  4. Dhomeostasis

Question 10

Biology
Which part of a flower develops into a seed?
  1. Apollen grain
  2. Bstigma
  3. Covule
  4. Dovary

Question 11

Biology
Which characteristic shows discontinuous variation in humans?
  1. Asex
  2. Bmass
  3. Cheight
  4. Dcomplexion

Question 12

Biology

The diagram shows the female reproductive system.

In which part, A, B, C or D, do sex cells mature?

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

Question 13

Biology
How is syphilis treated?
  1. Ausing antibacterial drugs
  2. Busing antiretroviral drugs
  3. Cusing anesthetic drugs
  4. Dusing analgesic drugs

Question 14

Biology
How is HIV transmitted?
  1. Athrough sexual contact
  2. Bthrough sharing towels
  3. Cthrough handshakes
  4. Dthrough bathing together

Question 15

Chemistry
Which mixture can be separated by a magnet?
  1. Acopper and carbon
  2. Bzinc and sulphur
  3. Clead and carbon
  4. Diron and sulphur

Question 16

Chemistry
Which factor decreases the rate of solubility when salt is dissolved in water?
  1. Aboiling
  2. Bwarming
  3. Ccooling
  4. Dstirring

Question 17

Chemistry

The Periodic Table shows the positions of elements A, B, C and D.

Which element, A, B, C or D, represents a non-metal?

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

Question 18

Chemistry
What is the concentration of sodium hydroxide solution when 3.0 g of sodium hydroxide are dissolved in 0.6 dm3^3 of water?
  1. A0.2 g/dm3^3
  2. B1.8 g/dm3^3
  3. C3.6 g/dm3^3
  4. D5.0 g/dm3^3

Question 19

Chemistry
A liquid in which a substance is dissolved is called a
  1. Asolute.
  2. Bsolvent.
  3. Csolution.
  4. Dsuspension.

Question 20

Chemistry

The diagram shows magnesium ribbon burning in air.

What is produced?

  1. Amagnesium oxide
  2. Bmagnesium carbonate
  3. Cmagnesium hydroxide
  4. Dmagnesium nitrate

Question 21

Chemistry
Which one is the least reactive metal?
  1. Airon
  2. Bzinc
  3. Ccopper
  4. Daluminium

Question 22

Chemistry
What type of reaction takes place when an acid reacts with a base?
  1. Aoxidation
  2. Breduction
  3. Ccrystalisation
  4. Dneutralisation

Question 23

Chemistry

The diagram shows the electrolysis of water using platinum electrodes.

Which half equation represents the reaction which takes place at the anode?

  1. A2H+−2e−→H22H^{+} - 2e^{-} \rightarrow H_2
  2. B2H++2e−→H22H^{+} + 2e^{-} \rightarrow H_2
  3. C4OH−+4e−→2H2O+O24OH^{-} + 4e^{-} \rightarrow 2H_2O + O_2
  4. D4OH−−4e−→2H2O+O24OH^{-} - 4e^{-} \rightarrow 2H_2O + O_2

Question 24

Chemistry
Which factor increases the production of biogas?
  1. Aan iron catalyst
  2. Ba pH of 2
  3. Ca temperature of 40 °C
  4. Dthe presence of copper

Question 25

Chemistry
The raw materials needed for the manufacture of sulphuric acid are
  1. Aammonia and oxygen.
  2. Bhydrogen and nitrogen.
  3. Csulphur dioxide and oxygen.
  4. Dnitrogen and sulphur dioxide.

Question 26

Chemistry
Incomplete combustion of butane produces water, heat and
  1. Aoxygen.
  2. Bhydrogen.
  3. Ccarbon dioxide.
  4. Dcarbon monoxide.

Question 27

Chemistry

The diagram shows an organic molecule.

To which homologous series does the organic molecule belong?

  1. Aalcohols
  2. Balkanes
  3. Calkenes
  4. Dhydrocarbons

Question 28

Physics
How many joules make 0.5 kilojoules?
  1. A50
  2. B500
  3. C0.05
  4. D0.005

Question 29

Physics

The diagram shows a tank containing some water.

Which expression gives the volume of the water?

  1. APQ x QS x ST
  2. BPQ x QV x UT
  3. CPQ x RU x UT
  4. DPQ x QV x VU

Question 30

Physics
Which one is not a type of energy?
  1. Aheat
  2. Bmass
  3. Csound
  4. Delectricity

Question 31

Physics
What is the purpose of the blackened copper plate in a solar water heater?
  1. Ato absorb heat from the sun
  2. Bto reflect heat to the sun
  3. Cto reflect heat to the water
  4. Dto conduct heat to the water

Question 32

Physics
In which situation is friction a useful force?
  1. Aa piston moving inside a cylinder
  2. Ba wheel turning on its axle
  3. Can athlete sprinting
  4. Da pulley lifting a load

Question 33

Physics

The diagram shows a 20 kg mass placed 150 cm from the pivot.

How far away from the pivot should a 25 kg mass be placed to balance the see-saw?

  1. A105 cm
  2. B120 cm
  3. C130 cm
  4. D150 cm

Question 34

Physics
Which pattern shows magnetic lines of force between two like poles of two bar magnets?
  1. AA
  2. BB
  3. CC
  4. DD

Question 35

Physics

A ruler is rubbed on hair.

The force of attraction between the rubbed ruler and pieces of paper is called

  1. Agravity.
  2. Bfriction.
  3. Cmagnetism.
  4. Delectrostatic.

Question 36

Physics

The diagram shows an electric circuit.

What is component P?

  1. Aa cell
  2. Ba bulb
  3. Ca switch
  4. Da resistor

Question 37

Physics

An electric iron is rated 1 kW; 250 V.

What is the correct fuse rating to use for the iron?

  1. A3 A
  2. B5 A
  3. C6 A
  4. D13 A

Question 38

Physics
What is the colour code of the earth wire?
  1. Agreen and yellow
  2. Bblue and green
  3. Cbrown and yellow
  4. Dbrown and blue

Question 39

Physics
Which unit is the same as the watt (W)?
  1. AJ
  2. BJ/m2^2
  3. CJ/s
  4. DJ/s2^2

Question 40

Physics
What is the advantage of using wireless gadgets like cell phones?
  1. Athey are portable and convenient
  2. Bthey are expensive
  3. Cthey do not need base stations
  4. Dthey do not require charging

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