Download and practise with this ZIMSEC O-Level Combined Science Paper 1 November 2022 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC O-Level Combined Science question paper for Paper 1 from November 2022. Use it for exam practice under timed conditions. The paper code is 4003/1. Time allowed: 1 hour.
# ZIMBABWE SCHOOL EXAMINATIONS COUNCIL <br> General Certificate of Education Ordinary Level
**COMBINED SCIENCE**
**PAPER 1 Multiple Choice**
NOVEMBER 2022 SESSION
1 hour
Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Calculator (optional)
Time: 1 Hour
### INSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to do so.
Write your name, Centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.
There are forty questions in this paper. Answer all questions.
For each question, there are four possible answers, A, B, C and D.
Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet.
Read very carefully the instructions on the answer sheet.
### INFORMATION FOR CANDIDATES
Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.
## Question 1
The diagram shows a plant cell.
Which part controls the activities of the cell?
## Question 2
Potato strips left in a strong sugar solution become plasmolysed because they
A gain water by osmosis.
B lose water by osmosis.
C gain sugar molecules by diffusion.
D lose sugar molecules by diffusion.
## Question 3
By which process do mineral ions enter into root hair cells?
A osmosis
B diffusion
C respiration
D active uptake
## Question 4
Which equation represents photosynthesis?
A carbon dioxide + oxygen + energy ⟶ glucose + water
B glucose + water + energy ⟶ carbon dioxide + oxygen
C carbon dioxide + water + energy ⟶ glucose + oxygen
D glucose + oxygen + energy ⟶ carbon dioxide + water
## Question 5
The diagram shows a set of apparatus which was assembled in a laboratory.
What does the set of apparatus measure?
A rate of evaporation
B rate of transpiration
C rate of photosynthesis
D rate of osmosis
## Question 6
Which part of the respiratory system is involved in gaseous exchange?
A nostril
B trachea
C bronchus
D alveolus
## Question 7
What is the importance of carbohydrates in a diet?
A for energy
B for growth
C for defence
D for strong bones
## Question 8
What is the purpose of mechanical digestion?
A increases surface area of food for enzyme action
B converts food from soluble to insoluble molecules
C makes food in the mouth to stick together
D produces salivary amylase
## Question 9
Which one is not a function of blood?
A defence
B excretion
C transport
D homeostasis
## Question 10
Which part of a flower develops into a seed?
A pollen grain
B stigma
C ovule
D ovary
## Question 11
Which characteristic shows discontinuous variation in humans?
A sex
B mass
C height
D complexion
## Question 12
The diagram shows the female reproductive system.
In which part, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), do sex cells mature?
## Question 13
How is syphilis treated?
A using antibacterial drugs
B using antiretroviral drugs
C using anesthetic drugs
D using analgesic drugs
## Question 14
How is HIV transmitted?
A through sexual contact
B through sharing towels
C through handshakes
D through bathing together
## Question 15
Which mixture can be separated by a magnet?
A copper and carbon
B zinc and sulphur
C lead and carbon
D iron and sulphur
## Question 16
Which factor decreases the rate of solubility when salt is dissolved in water?
A boiling
B warming
C cooling
D stirring
## Question 17
The Periodic Table shows the positions of elements \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) and \(\mathbf{D}\).
Which element, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), represents a non-metal?
## Question 18
What is the concentration of sodium hydroxide solution when 3.0 g of sodium hydroxide are dissolved in \(0.6 \mathrm{dm}^{3}\) of water?
A \(0.2 \mathrm{~g} / \mathrm{dm}^{3}\)
B \(1.8 \mathrm{~g} / \mathrm{dm}^{3}\)
C \(3.6 \mathrm{~g} / \mathrm{dm}^{3}\)
D \(5.0 \mathrm{~g} / \mathrm{dm}^{3}\)
## Question 19
A liquid in which a substance is dissolved is called a
A solute.
B solvent.
C solution.
D suspension.
## Question 20
The diagram shows magnesium ribbon burning in air.
What is produced?
A magnesium oxide
B magnesium carbonate
C magnesium hydroxide
D magnesium nitrate
## Question 21
Which one is the least reactive metal?
A iron
B zinc
C copper
D aluminium
## Question 22
What type of reaction takes place when an acid reacts with a base?
A oxidation
B reduction
C crystalisation
D neutralisation
## Question 23
The diagram shows the electrolysis of water using platinum electrodes.
Which half equation represents the reaction which takes place at the anode?
A \(2 \mathrm{H}^{+}-2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2}\)
B \(2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2}\)
C \(40 \mathrm{H}^{-}+4 e^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\)
D \(40 \mathrm{H}^{-}-4 e^{-} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\)
## Question 24
Which factor increases the production of biogas?
A an iron catalyst
B a pH of 2
C a temperature of \(40^{\circ} \mathrm{C}\)
D the presence of copper
## Question 25
The raw materials needed for the manufacture of …