COMBINED SCIENCE <br> PAPER 1 Multiple Choice
November 2024 SESSION
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 one is an example of an artificial ecosystem?
A pond
B sea
C desert
D river
Question 2
The diagram shows the carbon cycle.
Which process, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), leads to global warming?
Question 3
The function of vitamin A is to
A help improve vision.
B strengthen teeth and bones.
C boost the immune system.
D release energy from the cells.
Question 4
The diagrams show different types of teeth.
Which tooth, A, B, C or D, is used for cutting food into smaller pieces?
A
B
C
D
Question 5
Which substance builds up in a muscle during anaerobic respiration?
A oxygen
B ethanol
C lactic acid
D carbon dioxide
Question 6
The diagram shows an experimental set up to measure the rate of transpiration.
The apparatus represents a
A barometer.
B manometer.
C potometer.
D micrometer.
Question 7
The diagram shows the structure of a heart.
Which blood vessel, A, B, C or D, receives oxygenated blood from the lungs?
Question 8
Which one is a characteristic of a wind pollinated flower?
A strong scent
B bright petals
C sweet nectar
D feathery stigma
Question 9
The diagram shows the structure of a sperm cell.
Which part, A, B, C or D, supplies the energy needed by the sperm for movement?
Question 10
Which method of contraception prevents implantation of the fertilised egg?
A sterilisation
B use of spermicides
C Intra-uterine device
D use of a contraceptive pill
Question 11
The diagram shows the male reproductive system.
In which part, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), are sperms produced?
Question 12
Which one is a sign/symptom of genital herpes?
A insanity
B kidney damage
C yellow discharge of pus
D small blisters on the genitals
Question 13
The diagram shows the life cycle of the malaria parasite.
At which stage, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), is fever experienced?
Question 14
A mixture of water and alcohol is separated by fractional distillation because water and alcohol have different
A densities.
B solubilities.
C boiling points.
D melting points.
Question 15
The mass number of an element is the
A number of protons.
B number of electrons.
C sum of protons and neutrons.
D sum of protons and electrons.
Question 16
Chlorine exists as two atoms, \({ }_{17}^{32} \mathrm{Cl}\) and \({ }_{17}^{37} \mathrm{Cl}\).
Which statement, about the two chlorine atoms, is correct?
A The atoms form solid molecules at room temperature.
B The atoms have similar chemical reactions.
C The atoms have similar number of neutrons.
D The atoms can be separated by chemical reactions.
Question 17
Which statement, about properties of Group II elements, is correct?
A They react by gaining electrons.
B Reactivity decreases down the group.
C The atomic radius increases down the group.
D They react with water to form acidic solutions.
Question 18
Which gas is produced when aluminium reacts with steam?
A oxygen
B nitrogen
C hydrogen
D carbon dioxide
Question 19
Which substance turns blue litmus paper red?
A distilled water
B dilute sulphuric acid
C aqueous sodium chloride
D aqueous sodium hydroxide
Question 20
In the contact process, sulphur dioxide is reacted with oxygen to give sulphur trioxide. Which catalyst is used?
A iron
B nickel
C platinum-rhodium
D vanadium (V) oxide
Question 21
Which substance is a raw material in the manufacture of ammonium nitrate fertiliser?
A oxygen
B ammonia
C nitrogen
D sulphur dioxide
Question 22
The diagram shows the apparatus used during the electrolysis of water.
Which one is a positive test for gas \(\mathbf{K}\) ?
A turning limewater milky
B relighting a glowing splint
C producing a popping sound with a lighted splint
D turning pink cobalt paper to blue
Question 23
Reduction is the
A loss of electrons.
B loss of hydrogen.
C gain of electrons.
D gain of oxygen.
Question 24
Iron is extracted in the blast furnace. What is the function of the limestone in the blast furnace?
A to react with hot air
B to remove impurities
C to reduce iron (III) oxide
D to increase temperature
Question 25
The equation shows a reaction in the biogas digester.
Organic waste \(\longrightarrow \mathbf{X}+\) carbon dioxide
What is \(\mathbf{X}\) ?
A ethanol
B methane
C oxygen
D ethene
Question 26
Which of the organic molecules shown is a hydrocarbon?
A
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B
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C
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D
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Question 27
The diagram shows a Vernier calipers being used to determine the diameter of a cylindrical rod.
The diameter of the rod is
A 1.50 cm.
B 2.10 cm.
C 2.15 cm.
D 8.10 cm.