SGSS 2022 1Exp. EOY

[Turn Over SERANGOON GARDEN SECONDARY SCHOOL END-OF-YEAR EXAMINATION 2022 CANDIDATE NAME CLASS INDEX NUMBER LOWER SECONDARY SCIENCE 10 Oct 2022 Secondary 1 Express 2 hours 0820 - 1020 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class register number and class on in the spaces at the top of this page You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A [30 marks] There are thirty questions in this section. Answer all questions. For each question, there are four possible answers A, B, C and D. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Choose the answer you consider correct and shade your answer in the Optical Answer Sheet (OTAS). Section B [30 marks] Answer all questions. Write your answers in the spaces provided on the question paper. Section C [40 marks] Answer any four questions. Write your answers in the spaces provided on the question paper. A copy of the Periodic Table is provided on page 26. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use A 30 B 30 C 40 Total 100 This question paper consists of 26 printed pages and 0 blank page.

2 SGS/2022/EOY/1E/LSS Section A (30 marks) 1 Which of the following S.I. units is incorrectly matched to its physical quantity? physical quantity S.I. unit A time hour (h) B length metre (m) C volume cubic metre (m3) D mass kilogram (kg) 2 Marie Curie is the first female Nobel Prize winner for her work on radioactivity. Before her success, Marie Curie was unable to attend university in Poland. However, she did not give up on learning. She worked and eventually saved enough money to pursue higher education in France. What attitude is illustrated here? A Integrity B Objectivity C Open-mindedness D Perseverance 3 A chemical in the laboratory is known to be toxic and corrosive. Which hazard symbols should be labelled on the bottle containing this chemical? I II III IV A I and III B I and IV C II and III D III and IV 4 Which of the following group of substances are good conductors of heat? A copper, magnesium, calcium B carbon, calcium, fluorine C nitrogen, phosphorus, chlorine D sulfur, bromine, copper

3 SGS/2022/EOY/1E/LSS [Turn over 5 The following information about an electric water heater is provided. I It has a metal casing. II It is taller than a piece of A4 paper. III It has a capacity of 5 litres. IV It has a black plastic handle. Which of the above are examples of quantitative data? A I and III B II only C II and III D III only 6 Three balls have densities of 0.9 g/cm3, 1.0 g/cm3 and 1.4 g/cm3 respectively. They are immersed in four beakers carrying liquids of different densities. Which of the following beakers contains a liquid of density 1.1 g/cm3? A B C D

4 SGS/2022/EOY/1E/LSS 7 The table below shows the scale of hardness of different materials M to Q. The greater the value, the harder the material is. material M N O P Q hardness value 7 3 9 2 1 Which of the followin g statements can be correctly deduced from the scale about these five materials? A N can scratch material P but not O. B M can scratch material O and P. C P can scratch M but not Q. D Q can scratch all the other materials shown in the table. 8 Which of the following consists of an element, a compound and a mixture? A air, petroleum, seawater B carbon dioxide, pure water, neon C magnesium, sugar, seawater D pure water, hydrogen, magnesium 9 Which element is found in Group 16 and Period 4 of the Periodic Table? A Chromium B Hafnium C Molybdenum D Selenium 10 Which of the following methods is most effective in separating a mixture of copper filings and water? A filtration B magnetic attraction C simple distillation D reverse osmosis

5 SGS/2022/EOY/1E/LSS [Turn over 11 The table below shows the various melting and boiling points of four different substances, P, Q, R and S. melting point / ˚C boiling point / ˚C P -45 13 Q 12 47 R 19 98 S 26 120 Which of the following pairs of substances are best separated by distillation? Assume that the experiment is carried out at 25 ˚C. A P and Q B P and S C Q and R D R and S 12 Separate samples of the same mass of coarse sugar and fine sugar are both dissolved in 50 cm 3 of water as shown below. The mixture was stirred until no more sugar dissolved. Three statements are made about the experiment above. 1 The fine sugar dissolves faster than the coarse sugar. 2 After stirring, there will be a larger mass of undissolved coarse sugar than fine sugar. 3 Using more water will cause both sugars to dissolve faster. Which of the following statements about the above experiment is true? A 1 only B 1 and 2 C 1 and 3 D 2 and 3 fine sugar in water coarse sugar in water

6 SGS/2022/EOY/1E/LSS 13 The diagram shows parts of the Period Table. Which two elements have similar chemical properties? A P and R B Q and T C R and Q D S and T 14 Which of the following correctly represents a mixture of an element and a compound? A B C D 15 Calcium carbonate is a compound that can be found in egg shells. Its chemical formula is CaCO3. Which statement is true about calcium carbonate? A Calcium carbonate contains calcium and carbon dioxide. B Calcium carbonate and its constituent elements have the same physical properties. C Calcium cannot be obtained from calcium carbonate by physical methods. D The mass of each constituent element in calcium carbonate is the same.

7 SGS/2022/EOY/1E/LSS [Turn over 16 The following table shows the solubilities of three substance, M, N and O. solid solubility in water solubility in ethanol M Insoluble soluble N insoluble insoluble O soluble insoluble Some steps could be taken to obtain pure M from a mixture of M, N and O. I add ethanol II add water III filter IV evaporate to dryness Which method is the most effective? A I, II, III, IV B II, I, IV, III C II, III, IV D I, III, IV 17 Which method is used to obtain pure water from salt solution? A chromatography B distillation C evaporation D filtration 18 The diagram shows a ray of light reflected on a plane mirror. What is the angle of reflection? A 40o B 50o C 80o D 100o

8 SGS/2022/EOY/1E/LSS 19 An optician’s test card is fixed 50 cm behind the eyes of a patient who looks into a plane mirror 300 cm in front of her, as shown in the diagram below. What is the distance from her eyes to the image of the card? A 350 cm B 400 cm C 650 cm D 700 cm 20 Which of the following is an application of a concave mirror? A dentists’ mirror B security mirror in shops C rear view mirror in the vehicle D periscope 21 A ray of light strikes the surface of a glass block as shown in the diagram below. Which of the following shows the path of light after stri