YHSS Sec 2 Science 2014 EOY

END OF YEAR EXAMINATION 2014 Secondary Two Express SCIENCE PAPER 1 1 hour ADDITIONAL MATERIALS: OTAS Sheet Electronic Calculator INSTRUCTIONS TO CANDIDATES Do not open until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, and glue or correction fluid. Write your name, class and register number in the spaces provided at the top of this page and on the OTAS sheet provided. There are forty questions in 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 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. At the end of the examination, submit the OTAS and this question paper separately. A periodic table is attached on page 16. Gravity is considered as 10 N/kg unless otherwise stated. Values are to be left in 3 significant figures unless otherwise stated. This question paper consists of 16 printed pages . [Turn over] YUHUA SECONDARY SCHOOL CANDIDATE NAME CLASS 2E INDEX NUMBER

1 1 Which of the following is not a chemical change? A Heating an egg over a stove. B Chopping a piece of garlic into smaller pieces. C A plant carrying out photosynthesis. D Adding urine to an acidic jellyfish wound. 2 The colour of universal indicator at different pH values is given below. pH 1 4 11 Colour Red Yellow Blue What are the colours observed when a few drops of Universal indicator are added separately to dilute hydrochloric acid, vinegar and aqueous sodium hydroxide? Hydrochloric acid Vinegar Sodium hydroxide A Blue Yellow Red B Red Yellow Blue C Red Blue Yellow D Yellow Red Blue 3 Carbon monoxide is a pollutant emitted from car exhausts. Why is it harmful to humans? A It has no colour, taste or smell. B It has a corrosive action on lung tissue. C It forms a stable compound with blood. D It combines with oxygen in the lungs.

2 4 Which one of the following is an example of a reaction where matter and heat interact? A Photosynthesis B Respiration C Electroplating D Neutralisation 5 The proton number of aluminium, Al, is 27 and it is in Group III. What is the likely formula for aluminium oxide? A Al2O B Al2O3 C AlO D AlO2 6 The proton numbers of three elements are given below. Element X Y Z Proton number 19 20 16 Which of the following sets correctly represents the ions formed by these elements? A X- , Y2+ , Z2+ B X+ , Y2- , Z2+ C X+ , Y2+ , Z2- D X2- , Y+ , Z2- 7 Which ionic equation represents the neutralisation of dilute nitric acid and potassium hydroxide? A KOH(aq) + HNO3(aq) → KNO3(aq) + H2O(l) B OH-(aq) + HNO3(aq) → NO3-(aq) + H2O(l) C K+(aq) + NO3-(aq) → KNO3(aq) D H+(aq) + OH-(aq) → H2O(l)

3 8 A word equation is shown below. Carbon + Carbon dioxide à Carbon monoxide What is the balanced chemical equation for this reaction? A C + CO2 à 2CO B 2C + CO2 à 2CO C 2C + CO à 2CO2 D C + CO2 à C2O2 9 The micrograph below shows a cross-section of part of a stem. Which tissue transports water and mineral salts? 10 Which of the following processes described below does not involve diffusion? A The absorption of digested food substances from the small intestine to the bloodstream. B The movement of gases in and out of a leaf. C The transfer of carbon dioxide from the capillaries to the air sacs in the lungs. D The transport of water molecules up the xylem vessels. 11 The diagram shows a section through a human heart. Which is the correct flow of blood through the heart from the rest of the body? B C A D

4 A 1à2à3à4 B 3à4à2à1 C 4à3à1à2 D 1à2à4à3 12 The apparatus shown below was set up and left for two hours. Which of the following shows the correct colouration after two hours? In visking tubing In beaker A Brown Brown B Blue black Brown C Blue Black Blue black D Brown Blue black 13 The diagram shows part of the human alimentary canal. Which structure(s) is/are involved in protein digestion? Starch solution with saliva Starch solution in visking tubing Iodine solution

5 A 3 only B 2 and 3 C 3 and 4 D 4 only 14 Which of the following substance(s) have to be digested before it is absorbed into the bloodstream? I Amino acids II Glucose III Starch IV Fatty acids A III only B II and III C III and IV D I and IV 15 The molecules below represent molecules of starch, protein and fat.

6 Which of the following diagrams best represent the products of digestion in the small intestine? 16 The table below shows the enzymes used in the digestive system. Which of the following is incorrect? Enzyme Used in A Salivary amylase Mouth B Lipase Stomach C Carbohydrase Small intestine D Protease Stomach 17 A woman has contracted a sexually transmitted infection. Non-itchy rash appeared in her body which disappeared after some time and she suffered from a mild case of fever. Which of the following disease is the woman suffering from?

7 A AIDS B Chlamydia C Gonorrhoea D Syphilis 18 Which of following is true of human sexual reproduction? I A zygote with 23 pairs of chromosomes is formed. II An ovum divides into new cells. III Fertilisation must occur. IV The children are identical to their parents. A I and II only B I and III only C II and III only D III and IV only 19 The diagram shows part of the reproductive system of a man. What are the structures E, F, G and H?

8 E F G H A Sperm duct Urethra Testis Scrotum B Sperm duct Urethra Scrotum Testis C Urethra Sperm duct Testis Scrotum D Urethra Sperm duct Scrotum Testis 20 Which of the following birth control methods will alter the uterus lining? A Condom B Contraceptive pills C Diaphragm D Intra-uterine device 21 The diagram below shows 4 circuits. Which of the following circuit has the least resistance?

9 A B C D 22 Which of the following shows how the ammeter reading will be affected if the resistance of the rheostat is increased while voltage remains unchanged? Ammeter reading A Decreases B Remains unchanged C Increases D Zero 23 Which of the following should the fuse of an electric appliance be connected to? A Earth wire B Live wire C Metal casing D Neutral wire 24 If the cost of 1 kWh of electricity is 80 cents, what is the total cost of operating the following electrical appliances for 3 hours?