PRSS Sec 2 Science 2024 EOY (P1)

This document consists of 12 printed pages, including the cover page. Setter: Mr W. Chiang & Ms Quah WW [Turn over Pasir Ris Secondary School Name: Class: Register Number: SECONDARY 2 EXPRESS END OF YEAR EXAMINATION 2024 LOWER SECONDARY SCIENCE Paper 1 Multiple Choice Thursday 0800 – 1000 Additional Materials: Multiple Choice Answer Sheet 03 October 2024 Papers 1 and 2: 2 hours READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Do not use staples, paper clips, highlighters, glue, correction fluid or tape. There are thirty 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 Answer Sheet. Read the instructions on the Answer Sheet very carefully. Answers to Paper 1 and Paper 2 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You may proceed to answer Paper 2 as soon as you have completed Paper 1. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 12. The use of an approved scientific calculator is expected, where appropriate.

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 2 [Turn over Section A Answer all the questions. 1 Blue copper sulfate dissolves in water to form a blue solution. Excess copper sulfate is mixed with water. The mixture is filtered and the filtrate is distilled. What are the colours of the solid left in the filter paper and the liquid collected after distillation? solid liquid collected after distillation A blue blue B blue colourless C colourless blue D colourless colourless 2 A piece of paper has ‘PAL’ written on it. A student holds the paper in front of a plane mirror. Which image does the student see? A B C D

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 3 [Turn over 3 Equal masses of two different liquids are heated using the same heater. The graph shows how the temperature of each liquid changes with time. What does the graph tell us about the liquids? A Liquid 1 has a higher boiling point than liquid 2. B Liquid 1 has a higher melting point than liquid 2. C Liquid 1 starts to boil sooner than liquid 2. D Liquid 1 starts to melt sooner than liquid 2. 4 The diagram shows some human cells observed under the microscope. Which row shows the correct identity of structures P and Q? P Q A cytoplasm cell membrane B cytoplasm cell wall C nucleus cell membrane D nucleus cell wall P Q temperature liquid 1 liquid 2 0 time

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 4 [Turn over 5 An aircraft, flying at a constant height, is gaining speed. The four forces acting on the aircraft are: L, lift due to the wings R, air resistance T, thrust due to the engines W, the weight Which row correctly describes the forces acting on the aircraft? vertical forces horizontal forces A L = W T = R B L = W T > R C L > W T = R D L > W T > R 6 An object that has a mass of 15 kg on the Earth is taken to the Moon. The gravitational field strength on the Earth is 10 N/kg and on the Moon is 1.6 N/kg. Which row correctly shows the mass and the weight of the object on the Moon? mass / kg weight on moon / N A 15 24 B 15 150 C 24 15 D 150 24 7 A builder leaves two identical stone tiles resting on the ground at different positions. Which row correctly compares the forces and the pressures that the tiles exert on the earth at different positions? strength of force pressures A different different B different same C same different D same same R L T W

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 5 [Turn over 8 Jamie built a snowman during winter. The snowman is colder than the environment. She decided to cover the snowman with a wool jacket. Which statement is correct? A The jacket traps air as an insulator and reduces the transfer of heat , from the environment to snowman. B The jacket traps air as an insulator and reduces the transfer of heat , from the snowman to environment. C The snowman will melt, since the jacket keeps the snowman warm by trapping heat from the sun, within the jacket. D The snowman will melt , since the jacket reflects heat lost from the snowman , back to the snowman. 9 At regular intervals along a railway line, there is a gap between the rail sections. Which is the reason for the gap between the rail sections? A to allow for expansion of the rail sections during hot weather B to allow for vibrations of the rail sections as the train passes over them C to allow rain water to drain from the rail sections D to keep the wheels of the train and carriages on the rail sections 10 Which process involves convection? A bread toasting under a grill B heat passing through a copper bar C heat from the Sun warming a road surface D hot air rising to the top of a cool room 11 Which change is caused by light? A burning of charcoal to form ash B coating silver earrings with copper metal C forming glucose and oxygen in green leaves D removing stains using baking soda rail sections gap rail support

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 6 [Turn over 12 Flowers of a hydrangea bush are pink when grown in neutral or alkaline soil and blue when the soil is acidic. Three students made three different statements as shown below. student 1 Adding vinegar to a pot of hydrangea bush will turn the flowers pink. student 2 Adding distilled water to a pot of hydrangea bush will turn the flowers pink. student 3 Adding orange juice to a pot of hydrangea bush will turn the flowers blue. Which statement is/are correct? A student 1 only B student 3 only C students 1 and 2 only D students 2 and 3 only 13 Which two substances react to form a salt and water only? A calcium carbonate and sulfuric acid B magnesium and hydrochloric acid C potassium chloride and nitric acid D sodium hydroxide and ethanoic acid 14 Four beakers containing the same volume of water at the same temperature are placed on four hot metal plates A, B, C and D. The lower surfaces of the metal plates are kept at the same temperature. The plates are all the same size and thickness but are made from four different metals. The time taken to produce the stated temperature rises are given in the table. Which metal plate, A, B, C or D, is made of the poorest thermal conductor? temperature rise / °C time / s A 10 100 B 12 100 C 15 200 D 18 200 beaker water metal plate heat

PRSS_2024_2E_EOY_SCIENCE_P2 [Turn over 7 [Turn over 15 In the non-cyclical flow of energy in ecosystems, which process will result in energy gain? A decomposition by bacteria B photosynthesis C removal of faeces D respiration 16 The diagram shows a food chain. mahogany tree → caterpillar → small bird → owl Biomass is a measure of the total mass of living material in each population. In this food chain, which population has the largest biomass and the largest size? largest biomass largest population size A B C D mahogany tree mahogany tree owl owl caterpillar owl mahogany tree small bird 17 What is an example of a change in a physical factor in an ecosystem? A decrease in hunting of fish by bears B decrease in sleep among owls C increase in the population of frogs D increase in temperature of a river 18 The fuse of an electric kettle blows when it is switched on. This happens again after a new fuse is fitted. When the fuse