MATHS GUARDIOLA +263 774382888
 <br> **ZIMBABWE SCHOOL EXAMINATIONS COUNCIL** <br> **General Certificate of Education Ordinary Level**
**COMBINED SCIENCE**
PAPER 1 Multiple Choice NOVEMBER 2023 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, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) and \(\mathbf{D}\). 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
Which part of a cell contains the genetic material?
A nucleus
B cytoplasm
C cell wall
D cell membrane
Question 2
Which factor increases the rate of transpiration?
A high humidity
B low temperature
C high wind speed
D low light intensity
Question 3
Which condition is necessary for seeds to germinate?
A presence of soil
B presence of light
C presence of oxygen
D presence of carbon dioxide
Question 4
The diagram shows the internal structure of a leaf.

What is part P ?
A chloroplast
B palisade
C epidermis
D guard cell
Question 5
Chewing is important for
A stimulating the taste buds.
B improving the taste of food.
C killing the micro-organisms in food.
D increasing the surface area of food.
Question 6
Typhoid is caused by
A fungi.
B viruses.
C bacteria.
D protozoa.
Question 7
The diagram shows part of the nitrogen cycle. Which arrow, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), represents the first step in nitrification?

Question 8
Which blood vessel transports oxygenated blood to all parts of the body?
A aorta
B vena cava
C pulmonary artery
D pulmonary vein
Question 9
Which type of immunity is acquired by infants through breastfeeding?
A artificial active
B artificial passive
C natural active
D natural passive
Question 10
The diagram shows the female reproductive system. Where is the intra-uterine device inserted to prevent pregnancy?

Question 11
Which gas changes bicarbonate indicator from red to yellow?
A oxygen
B nitrogen
C water vapour
D carbon dioxide
Question 12
Which one is the end product of starch digestion?
A glucose
B glycerol
C amino acids
D fatty acids
Question 13
Which process is responsible for the movement of gases in and out of the alveolus?
A osmosis
B diffusion
C respiration
D active uptake
Question 14
The diagram shows a Visking tube with solution J placed in a beaker containing solution K.

Which row correctly identifies solutions J and K ?
solution J solution K
A distilled water salt solution
B distilled water distilled water
C salt solution salt solution
D salt solution distilled water
Question 15
The nuclide notation for an oxygen atom is \({ }_{8}^{16} \mathrm{O}\). The electronic configuration for the atom is
A 2,4 .
B 2,6 .
C 2, 8 .
D \(2,8,6\).
Question 16
The number of particles present in one mole of any substance is the
A Avogadro number.
B electron number.
C proton number.
D mass number.
Question 17
Which statement describes an ionic compound?
A It conducts electricity when in molten state.
B It does not dissolve in water.
C It has low melting and boiling points.
D It can be attracted by a magnet.
Question 18
The diagram shows a chromatogram obtained by separating dyes \(\mathbf{X}, \mathbf{Y}, \mathbf{Z}\) and \(\mathbf{W}\).

Which two dyes have the same number of inks?
A X and Y
B \(\quad \mathbf{X}\) and \(\mathbf{Z}\)
C \(\quad \mathrm{Y}\) and Z
D \(\quad\) Z and W
Question 19
Which one is a property of Group II elements?
A they are non metals
B they are unreactive
C are gases at room temperature
D they react with water forming alkaline solutions
Question 20
The diagram shows a pH scale.
Which position, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), represents the pH of water?
pH scale

Question 21
The equation shows a chemical reaction: \(2 \mathrm{NaOH}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O}\)
The equation represents
A an addition reaction.
B an oxidation reaction.
C a metal-acid reaction.
D a neutralisation reaction.
Question 22
Which condition is required for the production of ammonia?
A pressure of 1 atmosphere
B presence of platinum catalyst
C temperature of \(450{ }^{\circ} \mathrm{C}\)
D presence of vanadium (V) oxide catalyst
Question 23
The diagram shows the electrolysis of molten lead (II) bromide.

Which observation is made at electrode \(\mathbf{A}\) ?
A it becomes larger
B it becomes smaller
C there is no change
D bubbles of gas are seen
Question 24
Alloying is used for
A improving a metal's properties.
B making the metal more reactive.
C making the metal less toxic.
D purifying a metal.
Question 25
Which one is a by-product in the manufacture of soap?
A oil
B fatty acid
C glycerol
D sodium hydroxide
Question 26
Which equation, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), shows a reaction that occurs in the blast furnace?
A iron + oxygen ⟶ iron oxide
B iron + water → iron oxide + hydrogen
C iron oxide + magnesium ⟶ iron + magnesium oxide
D iron oxide + carbon monoxide ⟶ iron + carbon dioxide
Question 27
The diagram shows structural formulae of organic compounds. Which one is the structural formula of ethanol?
A
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B
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C
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D
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