NASS Sc(Chem) Prelim

Name: .... .... .. . .. . . .. . . ....... .. ... . .. . . ... ... . .. .. . .. .. . . .. . . . . . .. .. .. ... Register no: . .. .... .. . Class: ............. . NGEE ANN SECONDARY SCHOOL [QJ PRELIMINARY EXAMINATION SCIENCE PHYSICS/CHEMISTRY 5086/01 PAPER 1 23 August 2024 Additional Materials: Optical Answer Sheet READ THESE INSTRUCTIONS FIRST 1. Write in soft pencil. 2. Do not use staples, paper clips, highlighters, glue or correction fluid. 3. Write your name and index number on the Optical Answer Sheet in the spaces provided unless this has been done for you. 1 h 4. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. 5. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Answer Sheet. 6. Read the instructions on the Optical Answer Sheet very carefully. 7. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The total number of marks for this paper is 40. 8. Any rough working should be done in this booklet. 9. A copy of the Data sheet and Periodic Table are printed on page 20 and 21 respectively. 10. The use of an approved scientific calculator is expected, where appropriate. This document consists of 21 printed pages and! blank page. BP-227

1 Which pair consists of two vector quantities? A velocity and moment 8 pressure and force C mass and energy D potential difference and acceleration 2 The diagram shows two cameras used to determine the average speed of a car along a stretch of road. Cameras 1 and 2 detect the entry and exit of the vehicle along that stretch respectively. The diagrams below show the times at which cameras 1 and 2 capture the entry and the exit of the vehicle. The distance between the two cameras is 800 m. At entry At exit What is the average speed of the vehicle between the two cameras? A 6.6 m/s 8 7.4 m/s c 8.4 m/s D 31 m/s

3 The graph shows the speed of a car as it starts from rest. During part of this time, the acceleration is uniform. speed 30 m/s 25 20 15 10 5 v / v I v I / v 1 2 3 4 What is the magnitude of this uniform acceleration? 5 A 5.0 m/s2 B 6.0 m/s2 C 10 m/s2 time/s 6 D 20 m/s2 4 An astronaut sits in a space shuttle which takes off from the surface of the Earth. During his journey into space, what happens to the mass and weight of the astronaut due to the gravitational field of the Earth? mass weight A unchanged increases B unchanged decreases c decreases increases D decreases decreases BP-230

5 The diagram shows a watermelon and durian placed in two similar plastic bags. Both the watermelon and durian have the same mass. watermelon durian Why is the plastic bag containing the durian more likely to tear than the one containing the watermelon? A The force exerted by the durian on the plastic bag is larger than that exerted by the watermelon on the plastic bag. B The force exerted by the durian on the plastic bag is smaller than that exerted by the watermelon on the plastic bag. C The pressure exerted by the durian on the plastic bag is smaller. D The pressure exerted by the durian on the plastic bag is larger. 6 An object is moving to the right at constant speed. It is then acted upon by the three forces as shown in the diagram below. 3N object 2N 5N What is the effect of these three forces on the motion of the object? A The object moves to the right with constant speed. B The object moves to the right with a constant acceleration. C The object moves to the left with constant speed. D The object comes to a stop immediately. BP-231

7 The diagram shows a toy being balanced on the tip of a support toy • D •C support Which point is likely to be the centre of gravity of the toy? BP-232 8 A boat pulls a fishing net with some fish for 5.0 km. The force it has to apply is 2000 N. What is the work done in pulling the net with the fish? A 10 kJ B 10 MJ C 10 GJ D 10 TJ 9 A substance consists of particles that are close together and moving past each other at random. During heating, the substance changes its state of matter. What happened to the substance and its internal kinetic energy during change in state? substance internal kinetic energy A changes from solid to liquid unchanged B changes from solid to liquid increases c changes liquid to gas unchanged D changes liquid to gas increases

10 A sound wave travels from a point X to a point Y . • X • y Which diagram represents the movement of the air molecules, due to the sound waves, in the region between X and Y? A B c D 0 t 11 The diagram shows the displacement-distance graph of a wave travelling along a rope at a particular instant. Particle X in the rope has a displacement of 3m . For the next 0.2 s, particle X moves a distance of 3m . displacement I m Which statement is correct? A The period of the wave is 0.8 s. B The wavelength of the wave is 2 m. C The wave is a longitudinal wave. D The speed of the wave is 0.8 m/s. BP-233

12 The diagram shows the main components of the electromagnetic spectrum arranged in the order of increasing frequency. Some of the components are labelled. radio waves light Q increasing frequency Which row describes electromagnetic wave Q? name of Q application of Q A infrared waves sterilise medical equipment B infrared waves television remote controller c ultraviolet waves sterilise medical equipment D ultraviolet waves television remote controller 13 Light travels from air into a transparent block. Which block is made from the material in which the speed of light is 1.97 x 108 m/s ? A c BP-234

14 The graph shows how the current in an electrical device varies with the potential difference (p.d) across it. current J o�-.----�------� 0 p.d. What is the order of the resistance values of the electrical device at points J, K and L? largest smallest A J K L B J L K c K L J D L K J 15 Three similar light bulbs are connected to a set of batteries as shown in the diagram. The filament of one of the bulbs breaks. What happens to the voltmeter reading and ammeter reading? voltmeter reading ammeter reading A decreases increases B decreases decreases c unchanged increases D unchanged decreases BP-235

BP-236 16 The power rating of a 37-inch LCD television is 300 W. The consumer is charged 30 cents per kWh of energy transferred electrically from the mains supply. What is the cost of using LCD television for 5 hours? A 45 cents B 450 cents C 4500 cents D 45 000 cents 17 Which diagram shows the correct connections for a switch and lamp in a light circuit? A L----e---- N-..... -t----­ E -+--+---....... - c L--....---­ NI ---+---....... - E-..... -+----+-- B L-----..-- N--.... ---+-­ E -.....--+---+-- D L-...------ N -+-..... ---­ E -+--+---..,_- key L live N neutral E earth D metal case

18 The diagram shows the cross-sectional composition of a third series Singapore $1 coin and the metals that are used to construct the coin. brass steel nickel A magnet is placed near to the coin and the coin is attracted to the magnet. Which of the following pair of metals accounts for the attraction? A steel and copper B copper and brass C brass and nickel D steel and nickel 19 The diagram shows a solenoid near to a conductor. Current flows through the solenoid and conductor in the direction as shown. conductor current current D A magnetic force exerts on the conductor. What is the direction of the force on the conductor?