2024 ACSBR 2G3 SCI EOY Section A

Anglo-Chinese School (Barker Road) END-OF-YEAR EXAMINATION 2024 SECONDARY TWO EXPRESS SCIENCE Total Duration for All Sections: 2 hours SECTION A INSTRUCTIONS TO CANDIDATES: The use of an approved scientific calculator is expected, where appropriate. Do not use glue or correction fluid. INFORMATION FOR CANDIDATES: 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. 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 12 of this booklet. This question paper consists of 12 printed pages

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 2 Secondary 2 Express Science SECTION A (30 marks) Select the best answer and shade it on the OTAS provided. A1 Which of the following are skills and attitudes of a good scientist? 1 displays curiosity and asks questions 2 perseveres despite failures 3 possesses good verbal and written communication skills 4 recognises only observations that support the hypothesis of an experiment A 1 and 3 B 1, 2 and 3 C 1, 3 and 4 D All of the above A2 Sodium hydroxide solution is corrosive to skin when in contact. Which hazard symbol should be labelled on the container of sodium hydroxide solution? A B C D

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 3 Secondary 2 Express Science A3 Four students, A, B, C and D classified some materials based on three physical properties. Which student has classified the materials correctly? good electrical conductor poor thermal conductor flexible A ceramic glass metal B fibre plastic fibre C glass glass ceramic D metal fibre plastic A4 In the diagram below, where should the eye be placed so that the reading can be taken accurately? A5 The chemical formula for chalk is CaCO3. Which of the following statements is true? A Chalk is a compound made up of three atoms. B Chalk is a compound made up of three different elements. C Chalk is a mixture made up of three different elements. D Chalk is a mixture made up of a metal and non-metals. 20 10 A C D B

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 4 Secondary 2 Express Science A6 An individual suspects that someone has forged her signature on a cheque. The inks from the pens of four suspects , A, B, C and D, were compared with the ink on the form using chromatography. The resulting chromatogram is shown below. Which suspect, A, B, C or D, is guilty of forging the signature? A7 Individual Q is standing 50 cm in front of a plane mirror. He sees the image of P standing 100 cm behind him. What is the distance between the image of P from individual Q? A 100 cm B 150 cm C 200 cm D 300 cm A8 A student noticed a mirror at the corner of a shop, and she can see many other customers in shop, but they looked smaller. What type of mirror is described here? A concave mirror B convex mirror C plane mirror D rough mirror Q P 50 cm 100 cm ink A B C D starting line

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 5 Secondary 2 Express Science A9 The liver is an organ because A it is made of different types of cells performing the same function. B it is made of different types of organelles performing the same function. C it is made of several systems working together to perform a function. D it is made of several tissues working together to perform a function. A10 The table below shows the boiling points of some elements found in a mixture of gases. element helium nitrogen oxygen boiling point / °C - 269 - 196 - 183 Which elements have particles that are far apart and moving at high speeds at -190 °C? A helium B helium and oxygen C helium and nitrogen D nitrogen and oxygen A11 Which atom has an incorrect number of sub-atomic particles? atom number of protons number of neutrons number of electrons A 1 0 1 B 3 4 3 C 11 11 12 D 12 12 12 A12 Which of the following shows the correct information related to force? instrument to measure force SI unit A beam balance kilogram B electronic balance joule C spring balance newton D weighing scale pascal

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 6 Secondary 2 Express Science A13 Four cups, made of the same material, are filled with the same amount of water at different temperatures. They are placed on a table in a room with room temperature at 30 °C. Which cup will lose heat fastest to the surroundings? A B C D silvery surface 80 °C black surface 80 °C silvery surface 40 °C black surface 40 °C A14 An iron solid, a balloon filled with helium gas, and glass of liquid water are all heated from room temperature to 90 °C. Which row correctly arranges the substances in order of their extent of expansion? expands the least expands the most A helium water iron B iron helium water C iron water helium D water iron helium A15 Which of the following reactions shows thermal decomposition? A carbon dioxide + water → glucose + oxygen B calcium carbonate → carbon dioxide + calcium oxide C magnesium + oxygen → magnesium oxide D sulfuric acid + sodium hydroxide → sodium sulfate + water

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 7 Secondary 2 Express Science A16 The diagram below shows a dead log community. Which of the labelled parts make up the biotic environment? A sun only B earthworm and mushrooms C earthworm, insects and mushrooms D all of the above A17 Which is the tertiary consumer of this food chain? Grass → grasshopper → shrew → owl A grass B grasshopper C owl D shrew sun mushrooms insects earthworm

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 8 Secondary 2 Express Science A18 Which statement is true for parasitism? A Both organisms are harmed. B Both organisms benefit. C One organism benefit, and the other is harmed. D One organism benefit, and the other is unaffected. A19 It is estimated that 90% of the energy which flows through living organisms in a food chain is lost between one trophic level and the next. The producers in a food chain contain 1000 units of energy. How many units will reach the secondary consumers in the food chain? A 0.1 units B 1 unit C 10 units D 100 units 20 Four identical resistors are connected in circuits P, Q and R. Which list shows the circuits in order of their effective resistance from the largest to smallest? A P → Q → R B P → R → Q C Q → P → R D Q → R → P P Q R

Anglo-Chinese School (Barker Road) End-of-Year Examination 2024 9 Secondary 2 Express Science