Sec 1 NA St Patrick's School Science EOY 2023

106 St. Patrick's School End-Of-Year Examinations 2023 Subject : SCIENCE Date : 12 OCT 2023 Level : SECONDARY 1 NORMAL (ACADEMIC) Duration : 2 H INSTRUCTIONS TO CANDIDATES: DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. 1. Write your name, class and index number on the Question Paper and the Optical Answer Sheet in the spaces provided. It is also required that you SHADE your index number on the Optical Answer Sheet. 2. This paper consists of Three (3) Sections: Section A, Section B and Section C. 3. Answer ALL questions in Section A on the Optical Answer Sheet provided. 4. Answer ALL questions in Section B and Section C in the spaces provided. 5. Calculators may be used where necessary. Give all numerical answers to 3 significant figures. 6. DO NOT DETACH any sections from this paper. 7. Submit the Optical Answer Sheet and this paper SEPARATELY. INFORMATION FOR CANDIDATES: The number of marks is given in brackets [ ] at the end of each question. FOR MARKER’S USE ONLY: Section A [20] B [30] C [30] Total [80] Grade Score This question paper consists of 23 printed pages including this cover page. Section A: [20 marks] Each question is provided with four possible answers ( A, B, C and D). Select the most appropriate answer and shade you answers in the Optical Answer Sheet. 1 Which option correctly describes the ‘open-mindedness’ of a good scientist? A not falsely report one’s observations to fit beliefs B stick to the truth until the scientist’s discovery is proven C conducting the investigation a few times to obtain reliable results D be willing to accept that something could happen contrary to popular belief 2 The following hazard symbols are found on a bottle containing a chemical in the laboratory. Which row correctly identifies each hazard symbol? I II III A irritant explosive corrosive B corrosive flammable irritant C corrosive explosive toxic D irritant flammable toxic 3 Which process should be conducted before carrying out an experiment? A analyse data B recording data C forming conclusions D proposing hypothesis 4 At which position should the eye be placed to take the reading from the measuring cylinder?

107 5 A student bought some pencil lead with a thickness of 0.50 mm. He measured the thickness of his pencil lead and recorded the readings in the table. no. of readings 1st 2nd 3rd readings (mm) 0.59 0.60 0.59 Which option correctly describes the accuracy and precision of his readings? accuracy precision A low high B low low C high low D high high 6 When a student was cleaning, he noted that dust particles take a long time to settle down on surfaces. Why do dust particles take a long time to settle down? A Dust particles are less dense than air. B Gravity has no effect on tiny dust particles. C Air molecules that are always moving knock into them. D Dust particles repel one another as they are magnetic in nature. 7 The diagram shows the different processes that a substance undergoes. Which statement about the processes P, Q, and R is correct? A During processes P and Q, the energy of the particles increases. B During process P, the particles move slower and closer together. C During process Q, the distance between the particles decreases. D During process R, the attractive forces between the particles increases. 8 When particles undergo diffusion, there is a net movement of particles from a region of ___I___ concentration to a region of ___II___ concentration. Which row correctly identifies I and II? I II A low high B low low C high low D high high 9 The diagram shows two different gases separated by a tap. Which diagram best represents how the gas particles will be distributed after the tap is left open for some time? 10 Which statement about the elements in the Periodic Table is true? A Each element has its own unique proton number. B Elements can be broken down into simpler substances upon heating. C Elements in the Periodic Table are arranged according to their nucleon number. D The properties of the elements change from non-metallic to metallic as we move from left to right of the Periodic Table.

108 11 An atom of a newly discovered element was found to have a proton number of 88 and a mass number of 230. Which statement about this atom is correct? A The nucleus is negatively charged. B The atom has 88 protons and 142 neutrons. C The atom has 88 electrons and 142 protons. D All the subatomic particles are located in the nucleus of the atom. 12 Four atoms have the following chemical symbols. What can you conclude about the following atoms? A They have the same atomic masses. B They have the same number of electrons. C They have the same number of neutrons. D They have the same total number of electrons, protons and neutrons. 13 Three substances, X, Y and Z are represented in the diagrams. Which row best describes X, Y and Z? X Y Z A element compound element B compound mixture mixture C mixture element compound D mixture compound mixture 14 Which statement correctly describes the difference between a solution and a suspension? A A solution is always colourless but a suspension appears cloudy. B A solution can be separated by filtration but a suspension cannot. C A solution allows light to pass through but a suspension does not. D A solution allows more solutes to be dissolved in it than a suspension. 15 Mr Tan wants to dissolve some sugar in his coffee as quickly as possible. Which action will not help him to do so? A using a bigger cup B stirring the coffee more quickly C crushing the sugar into powder form D increasing the temperature of the coffee 16 Which property of a substance shows that it is pure? A melting between 96 to 103 °C B burning in air to form two new products C evaporating to dryness without any residue D producing only one spot on the chromatogram 17 Jacob accidentally mixed sand, table salt and iron fillings together. Which sequence of separation techniques should be used to separate and collect dry samples of each of the three substances? A add water → distillation → magnetic attraction B magnetic attraction → filtration → add water → distillation C magnetic attraction → add water → filtration → evaporation D filtration → magnetic attraction → dissolve in water → evaporation 18 The diagram shows a cell. Which row correctly describes the parts labelled I and II? I II A fluid-filled space jelly-like substance B fluid-filled space site where chemical reactions take place C stores water, food and mineral salts jelly-like substance D stores water, food and mineral salts site where chemical reactions take place

109 19 The table shows a scratch test carried out on three different materials, P, Q and R. If metal 1 is able to leave a scratch mark on metal 2, a tick (✓) is put in the box. If metal 1 is unable to leave a scratch mark on metal 2, a cross (✗) is put in the box. Which option correctly arranges the materials, P, Q and R in order of increasing hardness? least hard most hard A P Q R B R Q P C Q R P D Q P R metal 2 metal 1 P Q R P ✓ ✗ Q ✗ ✗ R ✓ ✓ 20 A ray of light strikes the surface shown in the diagram. What is the angle of reflection for the ray? A 38° B 52° C 104° D 142° Section B: [30 marks] Answer ALL questions in this section. Show your working and answers in the space provided. 1 Isaac conducted an experiment to investigate how the initial height at which he dropped a ball would affect the maximum height the ball could reach after bouncing once. F