2025 ACSBR 2G3 SCI EOY ANS

[Turn over END-OF-YEAR EXAMINATION 2025 SECONDARY TWO G3 LOWER SECONDARY SCIENCE Total Duration for All Sections: 2 hours SECTION A READ THESE INSTRUCTIONS FIRST Read the instructions on the OTAS answer sheet carefully. Write your index number, subject code and paper number clearly on the OTAS answer sheet provided for you. There are thirty questions on 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 OTAS 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. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. ANSWER SCHEME

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3 2G3/EOY/LSS/A/2025 [Turn over SECTION A (30 marks) Select the best answer and shade it on the OTAS provided. A1 Which row shows correct examples of random and systematic errors? random error systematic error A parallax error human error B parallax error zero error C zero error human error D zero error parallax error A2 Which combination of properties would make copper most appropriate for carrying electricity in wires? A High electrical conductivity, high flexibility B High electrical conductivity, high thermal conductivity C High thermal conductivity, low flexibility D Low electrical conductivity, high strength A3 A student measures the mass and volume of four different materials. Which material has the highest density? mass / g volume / cm3 A 40 40 B 50 25 C 60 30 D 80 20

4 2G3/EOY/LSS/A/2025 A4 The diagram shows two building materials with similar insulation properties. material X: wood insulation material Y: plastic insulation What makes material X more environmentally sustainable than material Y? A Material X is easier to install than material Y . B Material X is made from renewable plant sources while material Y is petroleum-based. C Material X is more cost-effective than material Y. D Material X provides better insulation than material Y. A5 Stainless steel is a mixture of iron and chromium metal. Which statement shows the property of stainless steel? A It can be attracted by a magnet. B It contains iron and chromium that are chemically combined. C It does not conduct electricity. D It has the same melting point as chromium.

5 2G3/EOY/LSS/A/2025 [Turn over A6 When magnesium powder is added to a colourless liquid H, a colourless gas K is formed which extinguishes a lighted splint with a “pop” sound. What statement is correct? A Both H and K are compounds. B H is a compound while K is an element. C H is a mixture while K is an element. D H is an element while K is a compound. A7 Study the list of substances given. water sodium chloride sugar carbon dioxide Which description about these substances is correct? A They are formed by diffusion. B They are gases at room temperature. C They can be separated by simple distillation. D They have properties that are different from the elements they are made up of. A8 A worker used liquid turpentine rather than water to remove paint from his hand. What information can be obtained from the above statement? A Liquid turpentine has a higher density than paint. B Liquid turpentine is the only solvent for paint. C Paint solubility depends on the type of solvent used. D Residue is seen after paint is placed in turpentine.

6 2G3/EOY/LSS/A/2025 A9 Which processes enable NEWater to be obtained from wastewater? 1 distillation 2 evaporation 3 microfiltration 4 reverse osmosis A 1 and 2 B 2 and 3 C 2 and 4 D 3 and 4 A10 The diagram shows a method used to separate an insoluble solid from a mixture. Which row correctly identifies W, X, Y and Z? W X Y Z A filter funnel salt solution conical flask beans B filter funnel sulfur filter paper water C filter paper sand filter funnel seawater D filter paper tea leaves filter funnel water W X Y Z

7 2G3/EOY/LSS/A/2025 [Turn over A11 Which statement about paper chromatography is correct? A The dyes to be separated must have colour. B The dyes to be separated must have different boiling points. C The dyes to be separated must have different solubility in the solvent. D The dyes to be separated must have the same density. A12 Why is water considered a precious resource that requires careful conservation? A Fresh water is very limited on Earth, and growing populations and climate change make water shortage worse. B Water conservation is only necessary in desert regions where rainfall is completely absent. C Water is expensive to produce and only available in luxury locations around the world. D Water is primarily used for recreational activities and swimming pools, making it a luxury item. A13 The diagram shows a light ray hitting a plane mirror. What is the angle of reflection? A 30° B 60° C 90° D 120° 30°

8 2G3/EOY/LSS/A/2025 A14 Blind-corner mirrors are placed at traffic junctions for safety. Which type of mirror and its property would be most suitable for this purpose? A concave mirror as it has a large field of vision B concave mirror as it has a small field of vision C convex mirror as it has a large field of vision D convex mirror as it has a small field of vision A15 The diagram shows white light passing through a prism. What is this behaviour of light known as? A absorption and dispersion B absorption and refraction C dispersion and reflection D dispersion and refraction

9 2G3/EOY/LSS/A/2025 [Turn over A16 Which region of the electromagnetic spectrum is responsible for causing sunburn? A infrared radiation B radio waves C ultraviolet radiation D visible light A17 The diagram below shows a typical animal cell. Which row correctly identifies X, Y and Z? X Y Z A cell membrane cytoplasm nucleus B cell wall cytoplasm nucleus C cytoplasm cell membrane nucleus D vacuole cytoplasm nucleus X Y Z

10 2G3/EOY/LSS/A/2025 A18 Haemophilia is a genetic disorder that is passed down from one generation to the next. The blood of people with haemophilia does not clot normally. How is this disorder passed down from the parents to the child? A The chloroplasts that contain genes for haemophilia are passed down from the parents to the child. B The chromosomes that contain genes for haemophilia are passed down from the parents to the child. C The cytoplasm that contains genes for haemophilia is passed down from the parents to the child. D The vacuoles that contain genes for haemophilia are passed down from the parents to the child. A19 What is the function of the cell membrane? A It is fully permeable to allow any substances to move in and out of a cell. B It is partially permeable to allow small-sized substances to move in and out of a cell. C It is the site of chemical reactions. D It stores liquid, food and waste materials. A20 Which statement best describes why the heart is an organ? A It is made up of different types of cells working together to perform a specific function. B It is made up of different types of tissues working together to perform a specific function. C It is made up of same type of cells working together to perform a specific function. D It is made up of same type of tissues working together to perform a specific function.