2025 WSS Physics Prelim Paper 1 QP

_________________________________________________________________________ This document consists of 21 printed pages and 3 blank pages Name: ( ) Class: WHITLEY SECONDARY SCHOOL A Caring and Learning Community of Leaders Perseverance * Respect * Integrity * Discipline *Empathy PRELIMINARY EXAMINATION 2025 Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Class and index number on the Answer Sheet in the spaces provided. There are forty questions on 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Total / 40 SUBJECT : PHYSICS PAPER 1 (6091/01) LEVEL : Sec 4 G3 DATE : 2 September 2025 DURATION : 1 hr SETTER : Mr Krishan Sanjay VETTER : Ms Keira Htay

2 1 What is the correct order of magnitude for the diameter of an atom, the diameter of the Earth, and the diameter of a human hair? diameter of an atom diameter of Earth diameter of human hair A 0.1 µm 10 Mm 100 µm B 0.1 µm 10 Gm 10 µm C 0.1 nm 10 Mm 100 µm D 0.1 nm 10 Gm 10 µm 2 Which of the following lists of SI units contains only base units? A ampere, kilogram, kelvin, metre, mole B ampere, kilogram, metre, newton, ohm C kelvin, mole, newton, second, volt D kilogram, metre, mole, ohm, second 3 A car is travelling at a velocity of 2.0 m / s. It accelerates at 0.20 m / s2 for 2.5 minutes. What is the final velocity of the car? A 2.5 m / s B 5.2 m / s C 30 m / s D 32 m / s

3 4 The velocity-time graph of two cars is shown. Car X and car Y started off their journey from the same position when t = 0.0 s. At what time will the two cars pass each other again? A 1.0 s B 2.0 s C 3.0 s D 4.0 s 5 An aircraft heads north-east at 400 km / h. The wind is blowing towards the north-west at 100 km / h. Which vector diagram represents the correct way to obtain the resultant velocity of the aircraft? A B C D

4 6 Two boxes, P and Q, were pushed along a smooth surface from rest. The acceleration of box P is twice that of box Q. The mass of box Q is thrice of box P. Which of the following shows the correct relationship between force exerted on box P, Fp and force on box Q, FQ? A Fp = (2/3) FQ B Fp = (3/2) FQ C Fp = 3 FQ D Fp = 6 FQ 7 An athlete with mass 80 kg trains by performing press-ups with a load on his back. The diagram shows the perpendicular distances involved. The centre of mass of the athlete is CM and the centre of mass of the load he is carrying is CL. The mass of the load is 10 kg. What is the upward force exerted on his two arms? A 90 N B 230 N C 670 N D 900 N

5 8 A student makes a model toy which balances on the end of a metal rod. Why are the weights needed? A They increase the pressure on the rod. B They increase the weight of the model. C They lower the centre of gravity below the top of the rod. D They raise the centre of gravity above the top of the rod. 9 Which object will exert the greatest pressure on the ground? weight / N contact area with ground / cm2 A 50 100 B 280 150 C 9400 200 D 20000 600 metal rod

6 10 The diagram shows a mercury barometer. Some liquid less dense than mercury is found above the mercury column. The atmospheric pressure is 76 cm Hg, density of the liquid and mercury are 1200 kg / m3 and 13600 kg / m3 respectively. What is the height of the liquid column? A 0.02 cm B 2.0 cm C 22.7 cm D 26.0 cm

7 11 A spring fixed at one end, has a mass attached to the other end. The mass bounces up and down. It is shown in the diagram at three positions X, Y and Z. Which row correctly describes the kinetic and gravitational potential stores for the mass and the elastic potential stores in the spring? kinetic store gravitational potential store elastic potential store A maximum for Y maximum for X maximum for Z B maximum for Y minimum for Z maximum for Y C zero for X maximum for X maximum for X D zero for Z minimum for Z zero for X 12 Which option correctly describes the mechanism by which energy is transferred to food in a microwave oven? A electrically B heating C mechanically D propagation of waves

8 13 A gas placed in a container of fixed volume is heated. What effect does this have on the gas? A Both the pressure and temperature of the gas increase. B Neither the pressure nor temperature of the gas increases. C Only the pressure of the gas increases. D Only the temperature of the gas increases. 14 Results from a Brownian motion experiment involving smoke particles in air shows that heavy particles settle quickly. However, very small particles remain suspended for a long period of time. Which of the following statements explain the behavior of very small particles? A Air pressure has a greater effect on smaller particles. B Random molecular bombardment by air molecules keeps the particles suspended. C The Earth’s gravitational field does not act on small particles. D The small smoke particles have the same density as the air.

9 15 A water bath is filled with boiling water. Four rods of different materials are coated with solid wax and placed in contact with the metal container holding the boiling water. At the end of the experiment, rod P had the most melted wax, while rod S had the least melted wax. Which row best fits the likely materials of all 4 rods? rod P rod Q rod R rod S A copper glass iron wood B copper iron glass wood C wood glass iron copper D wood iron glass copper 16 A person places his two feet on two separate surfaces, a woolen carpet and a marble tile. Both surfaces are initially at the same temperature. Which statement best describes how the person will feel? A Both surfaces feel the same since both are at the same temperature initially. B The foot on the carpet feels warmer because the carpet transfers heat to the foot. C The foot on the tile feels cooler because the tile transfers coldness to the foot. D The foot on the carpet feels warmer because the rate of heat transfer is slower through the wool. P Q R S

10 17 A container of water is heated at a constant rate in an insulated container till half of it vaporizes. Which of the following graphs shows how the temperature changes during this time? 18 Which of the following is not a difference between boiling and evaporation? A Evaporation is a slow process but boiling is a fast process. B Evaporation occurs from 0 °C to 100 °C but boiling takes place only at the boiling point. C During evaporation, there is a change in state and temperature while boiling involves a change in state only. D Evaporation does not require an external thermal energy source while boiling requires.