BTYSS Sec 2 Science 2025 EOY (Section B)

BEATTY SECONDARY SCHOOL END-OF-YEAR EXAMINATION 2025 SECONDARY TWO G3 CANDIDATE NAME CLASS REGISTER NUMBER LOWER SECONDARY SCIENCE 6 October 2025 Setter: Ms Ain Sections A, B and C: 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST This Lower Secondary Science Paper consists of 3 sections – Sections A, B and C. SECTION B (40 MARKS) You are advised to spend no more than 90 minutes on Sections B and C. Write your name, class and register number on all the work you hand in. 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. Answer all questions in the spaces provided on the question paper. A copy of the Periodic Table is printed on page 12. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use B 40 This document consists of 12 printed pages. [Turn over

2 Section B Answer all the questions in this section in the spaces provided. 1 Methane (CH4) is a gas produced when cows release waste gases. Methane reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). (a) State the type of chemical reaction that takes place when methane reacts with oxygen. …………………………………………………………………………………………….. [1] (b) The molecules of methane and oxygen are given in Fig. 1.1. Fig. 1.1 Based on the principle of conservation of mass, draw the products of the reaction between one methane molecule and two oxygen molecules in the box provided in Fig. 1.1. [2] (c) Explain the difference in the composition between an element and a compound. Include an example of an element and a compound from the named reaction in (a). ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] [Total: 4] methane oxygen C H H H H O O O O +

3 2 A drop of blood is viewed under a microscope. Fig. 2.1 shows some red and white blood cells. Fig. 2.1 (a) Other than size and number of cells, compare the two types of cells by stating one visible similarity and one visible difference. similarity …………………………………………...………………………………………… ………………………………………………………………………………………………… difference ……………………………………………………………………………………. …………………………………………………….………………………………………. [2] (b) Using Fig. 2.1, explain why blood is considered a tissue. ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] [Total: 3] 3 Table 3.1 shows information of three elements, X, Y and Z. Table 3.1 element number of protons number of electrons number of neutrons X 9 9 10 Y 19 18 20 Z 10 10 10 (a) Determine the atomic number and nucleon number for element X. atomic number …………………………… nucleon number …………………………… [1] red blood cell white blood cell

4 (b) A student claims that element Y is an atom. Do you support the student’s claim? Use data in Table 3.1 to support your explanation. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………….. [2] (c) Using the Periodic Table, name and write the chemical symbol for the element represented by Z. name …………………………… chemical symbol …………………………… [1] [Total: 4] 4 (a) Fig. 4.1 shows a Newton’s cradle. A typical Newton's cradle consists of metal balls suspended in a metal frame so that they just touch each other at rest. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a force through them that pushes the last sphere upward. This sphere then swings back and strikes the other spheres, repeating the effect in the opposite direction. Fig. 4.1 (i) Explain the scientific principle that causes the spheres to swing back and forth. ……………………………………………………………………………………….. ……………………………………………………………………………………. [1] (ii) Suggest why the spheres can theoretically go on indefinitely (without end) if the Newton's cradle is placed in a vacuum container. ……………………………………………………………………………………….. ……………………………………………………………………………………. [1]

5 (b) Fig. 4.2 shows a boy standing on his skateboard at the top of a track. The total weight of the boy and his skateboard is 400 N. Fig. 4.2 (i) State and explain whether work is done when the boy carries his skateboard from the bottom to the top of the stairs. ………………………………………………………………………………………… ………………………………………………………………………………..…… [1] (ii) The boy travels on his skateboard until he reaches point S on the track, where he stops momentarily. Explain why this point is lower than point P. ………………………………………………………………………………………… ………………………………………………………………………………..…… [1] (iii) State at which point (P, Q, R or S) would the boy have the most kinetic energy. Explain your answer. ………………………………………………………………………………………… ………………………………………………………………………………..…… [1] [Total: 5] P Q R S 4 m

6 5 Fig. 5.1 shows a food chain with the flow of energy. Fig. 5.1 (a) Calculate the energy values of M and N. energy value of M = …………………………….. units energy value of N = …………………………….. units [1] (b) Suggest a process that might account for the loss of energy from organisms to the environment. …………………………………………………………………………………………….. [1] (c) Suggest why the movement of energy in the food chain is described as a flow (one- directional) and not a cycle. ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] (d) Explain how organism X contributes to the flow of nutrients in the food chain. ………………………………………………………………………………………………… …………………………………………………………………………………………….. [1] [Total: 4]

7 6 Fig. 6.1 shows a pool filled with water. A woman was walking around the pool and she spotted a ring at the bottom of the pool. Fig. 6.1 (a) On Fig. 6.1, draw the apparent position of the ring's image as seen by the woman's eye. [1] (b) (i) On Fig. 6.1, draw two rays to locate the image to the woman’s eye. [1] (ii) On Fig. 6.1, draw two rays from the ring to the eye to show that the rays are refracted. [1] (c) Explain why the eye sees the apparent position of the ring as drawn in (a). ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………..…… [2] [Total: 5]

8 7 Four identical potato strips are placed in four different solutions J, K, L and M. The solutions are of different concentrations. The solutions are: • 0.1 g/cm3 sugar solution • 0.3 g/cm3 sugar solution • 0.6 g/cm3 sugar solution • distilled water The length of each potato strip is recorded after ten minutes. Fig. 7.1 shows the results. Fig. 7.1