KCPSS Sec 2 Science EOY 2022

KCPSS.2E.LSS.MYE.2016 [Turn over KUO CHUAN PRESBYTERIAN SECONDARY SCHOOL 2022 END OF YEAR EXAMINATION Secondary 2 Express/SBB NAME CLASS REG. NO LOWER SECONDARY SCIENCE 13 October 2022 2 hours Additional Materials: Multiple Choice Answer Sheet Setter: Mrs Cheong Hwee Leng READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. This paper consists of 3 sections. Section A consists of 30 multiple-choice questions. Answer all questions. For each question, choose the most appropriate answer and shade the letter corresponding to the answer in soft 2B pencil on the separate Multiple Choice Answer Sheet. Section B consists of 7 structured questions. Answer all questions in dark blue or black pen in the space provided on the Question Paper. Section C consists of 4 free response questions. Answer any three questions in dark blue or black pen in the space provided on the Question Paper. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 28. For Examiner’s Use Section A Section B Section C Total /100 This document consists of 28 printed pages, including the cover page. ……………..…………...... Parent’s signature/ Date / 30 / 40 / 30

2 KCPSS.2E.LSS.EOY.2022 [Turn over Section A (30 marks) Answer ALL questions in this section. Shade the letter corresponding to the answer in soft 2B pencil on the separate Multiple Choice Answer Sheet. 1 Three identical resistors are joined in series to a cell. Voltmeter Q reads 8.0 V. What is the reading on voltmeter P and the potential difference of the cell? reading on P / V potential difference of cell / V A 4.0 8.0 B 4.0 12.0 C 8.0 8.0 D 8.0 12.0 2 A current flows through a metal wire when a potential difference is applied across its ends. The diagram below shows which ends of it are connected to the positive and negative terminals of a dry cell. What charges flow in the wire in what direction? A negatively charged electrons flow from left to right B negatively charged electrons flow from right to left C positively charged protons flow from left to right D positively charged protons flow from right to left

3 KCPSS.2E.LSS.EOY.2022 [Turn over 3 The diagram shows three identical resistors, three ammeters and a battery, connected in a circuit. What is the order of the readings on the ammeters from smallest to largest? smallest intermediate largest A ammeter 1 ammeter 2 ammeter 3 B ammeter 1 ammeter 3 ammeter 2 C ammeter 2 ammeter 3 ammeter 1 D ammeter 3 ammeter 2 ammeter 1 4 What is a possible result of replacing the fuse in an electrical appliance with one of a higher rating? A Less current will flow through the appliance and will not cause overheating. B More current will flow through the appliance and will cause overheating. C More protection is provided against a short circuit occurring. D The fuse is more likely to melt. 5 Automated external defibrillators (AEDs) are used to provide immediate help to those suffering from cardiac arrest in public places. An AED sends an electric shock to the heart through electrode pads placed on the chest in order to revive the heart. Which of the following is not to be followed when using the AED? A Ensure nobody is touching the cardiac arrest victim while administering the electric shock. B If the cardiac arrest victim is wearing a metallic necklace, move it aside of the neck. C Wipe the body of the cardiac arrest victim of any sweat. D Wrap the chest of the cardiac arrest victim with a piece of wet cloth for better conduction of electricity through his body. 6 Which organ is not part of the alimentary canal? A colon B liver C oesophagus D stomach

4 KCPSS.2E.LSS.EOY.2022 [Turn over 7 Excess gastric juices produced in the stomach may cause indigestion and gastric pains. These can be relieved by taking antacids. Which row correctly shows the chemical substances found in the stomach and antacid? chemical substance in the stomach chemical substance in the antacid A hydrochloric acid calcium carbonate B hydrochloric acid calcium nitrate C sulfuric acid calcium sulfate D sulfuric acid calcium hydroxide 8 Which graph shows the rate of digestion of starch in the three parts of the alimentary canal? A B C D

5 KCPSS.2E.LSS.EOY.2022 [Turn over 9 The diagram shows a cross section of a human heart. Which of the following correctly matches the blood vessel to its function? carries oxygenated blood transports blood to the lungs A 1 4 B 2 1 C 3 2 D 4 3 10 Cylinders of potato tissue were placed in different concentrations of a sugar solution. The graph shows the percentage change in length of the cylinders of potato tissue. Which solution has the same water concentration as the potato tissue? A 0.0 mol dm-3 B 0.2 mol dm-3 C 0.3 mol dm-3 D 0.5 mol dm-3 1 2 3 4 concentration of sugar solution/ mol dm-3

6 KCPSS.2E.LSS.EOY.2022 [Turn over 11 The following diagram shows a cross section of a stem. Which part carries dissolved mineral salts? 12 Which of the following statements about vasectomy is not correct? A A man cannot produce sperms anymore. B A man is still susceptible to STIs after the vasectomy. C A man is unable to have children after vasectomy. D It requires a man to undergo a surgical procedure. 13 Which of the following labelled parts is not part of the male reproductive system? 14 Which contraceptive method reduces the risk of transmitting syphilis and gonorrhea? A chemical spermicide gel B condom C intra-uterine device D ligation A B C D A B C D

7 KCPSS.2E.LSS.EOY.2022 [Turn over 15 Which part of the female reproductive system is most likely to be affected by contraceptive pills? A fallopian tube B ovary C uterus D vagina 16 A girl uses 1 joule of energy to climb up a step. Which of the following correctly states the work done by the girl on herself and on the step? work done on the girl/J work done on the step/J A 0 0 B 0 1 C 1 0 D 1 1 17 A ball is dropped from a height as shown. Ignoring the effects of air resistance, the total energy is A greatest at point 1. B greatest at point 2. C greatest at point 3. D the same at all points. 18 What would be an undesirable effect on the environment of building a hydroelectric power station? A construction of the dam requires many non-renewable resources B destruction of forests and wildlife by building the dam C produces tremendous amount of air pollutants D uses large amount of potable (undrinkable) water

8 KCPSS.2E.LSS.EOY.2022 [Turn over 19 The diagram shows some changes between three different physical states of matter. Which of the changes involves absorbing thermal energy from the surroundings? A 1 and 2 only B 1 and 3 only C 2 and 4 only D 1, 2 and 4 only 20 The diagram below shows the inside of a hot water flask. Which form of heat transfer do the following parts in a vacuum flask prevent / reduce? silvering stopper vacuum A conduction conduction and convection conduction and convection B conduction conduction and convection radiation C radiation conduction and convection conduction and convection D radiation conduction and convection radiation 21 Which of the following examples does not illustrate a physical change of matter? A Alcohol solvent vapourises from its bottle when it is left open. B Sugar cubes turn black when they are