SCGS 2025 PHY PRELIM P1 QP

SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY FOUR CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER PHYSICS 6091/1 Paper 1 Multiple Choice 28 August 2025 1 hour 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 Question Paper and Answer Sheet in the spaces provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers A, B, C, 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. Take g = 10 ms-2 or 10 Nkg-1 unless specified otherwise. This question paper consists of 19 printed pages and 1 blank page.

2 1 For which measurement would a micrometer screw gauge be most suitable for accurate measurement? A diameter of an atom B diameter of a wire C length of this page D length of a pencil 2 A metal ball is attached to a cork with a string and lowered into a measuring cylinder of water until the ball is fully submerged while the cork remains above the water, as shown in Fig. 2.1. The string is then lowered further so that both the ball and the cork are fully submerged, as shown in Fig. 2.2. → Fig. 2.1 Fig. 2.2 The mass of the cork is 4.8 g. What is the likely density of the cork? A 0.15 g/cm3 B 0.20 g/cm3 C 0.60 g/cm3 D 5.0 g/cm3 3 Two forces P and Q act on an object. Which diagram shows the resultant of these two forces? A B C D

3 4 The figure below shows the velocity-time graphs of two vehicles X and Y. The accelerations and distances travelled by the two vehicles over the 5 s period can be estimated from the graphs. Which statement is correct? A The accelerations of X and Y are the same at 2.5 s. B The acceleration of Y is greater than that of X. C The distance travelled by X is greater than that travelled by Y in the 5 s period. D The distances travelled by X and Y in the 5 s period are the same. 5 A ball is released from rest above a horizontal surface. The graph below shows the variation of its velocity with time. Why are areas X and Y equal? A For one impact, the speed at which the ball hits the surface equals the speed at which it leaves the surface. B The ball rises and falls through the same distance between impacts. C The ball’s acceleration is the same during its upward and downward motion. D The speed at which the ball leaves the surface after an impact is equal to the speed at which it returns to the surface for the next impact. X Y time / s velocity / ms-1 1 2 3 4 5 5 4 3 2 1 0 0

4 6 A box rests on the Earth, as shown in the diagram below. Newton’s third law describes how forces of the same type act in pairs. If the weight W of the box is one of the forces, w hich arrow represents the other force in this pair? 7 An object is accelerating under the influence of a force, F1, on a frictionless surface, as shown in Fig. 7.1. A while later, an opposing force, F2, of the same magnitude acts on it, as shown in Fig 7.2. Fig. 7.1 Fig. 7.2 Which statement correctly describes the object’s motion immediately after the opposing force acts on it? A The object will slow down. B The object will move at constant velocity. C The object will move in the opposite direction. D The object will come to rest.

5 8 One end of a U -shaped tube is connected to a gas tap, with its other end open to the atmosphere, as shown in the diagram. It contains water of density 1000 kg/m3 and the heights of the water columns on both sides are indicated. The atmospheric pressure is 101 kPa. What is the pressure of the gas from the gas tap? A 99 kPa B 100 kPa C 102 kPa D 103 kPa 9 The diagram shows a drawing pin (thumb tack) with a sharp point at one end and a flat surface at the other end. The pin is pushed into a wooden board. How do the pressure and the force at the sharp point compare with the pressure and the force on the flat surface? force at the sharp point pressure at the sharp point A greater than on the flat surface greater than on the flat surface B greater than on the flat surface less than on the flat surface C the same as on the flat surface greater than on the flat surface D the same as on the flat surface less than on the flat surface density 1000 kg/m3

6 10 A student states ‘If an object is in equilibrium, the sum of clockwise moments about point X is equal to the sum of anticlockwise moments about point Y.’ Under which condition would this statement be correct? A Either X or Y is the centre of gravity of the object. B Either X or Y is the pivot of the object. C X and Y are at opposite ends of the object. D X and Y are the same point on the object. 11 The diagram shows a uniform rod of length 30 cm and weight 5.2 N attached to a wall by a hinge at one end. The other end of the rod is supported by a wire so that the rod is horizontal and in equilibrium. The wire is at an angle of 40 to the horizontal. What is the tension in the wire? A 3.4 N B 4.0 N C 6.8 N D 8.1 N 12 Car X is travelling at half the speed of car Y. Car X has twice the mass of car Y. Which statement is correct? A Car X has half the kinetic energy of car Y. B Car X has one quarter of the kinetic energy of car Y. C Car X has twice the kinetic energy of car Y. D The two cars have the same kinetic energy.

7 13 A bungee jumper jumps from a platform and is decelerated by an elastic bungee cord, as shown in the diagram. As the jumper falls, his initial energy in the gravitational potential store is transferred to his kinetic store and the elastic potential store of the cord. At which part of the jump is energy in all three stores non-zero? A on the platform before the jump B on the way down before the cord starts to extend C on the way down as he decelerates D at the bottom of the jump when he is momentarily stationary 14 A hydroelectric power station uses energy in the gravitational potential store of water to generate electrical energy. In a particular power station, the mass of water flowing per unit time is 1.5  105 kgs-1. The water falls through a vertical height of 120 m. The electrical power generated is 100 MW. What is the efficiency of the power station? A 5.6% B 43% C 56% D 76% 15 The specific heat capacity of solid P is greater than that of solid Q. What does this statement mean? A Less energy is needed to raise the temperature of a unit mass of solid P by 1 C than that of solid Q. B Less energy is needed to melt a unit mass of solid P than a unit mass of solid Q. C More energy is needed to raise the temperature of a unit mass of solid P by 1 C than that of solid Q. D More energy is needed to melt a unit mass of solid P than a unit mass of solid Q.

8 16 A student splashes water onto her face. Here are three statements about the effects. P The water uses energy to evaporate. Q The water gains energy from the student. R The face of the student cools. Which statements are correct? A P and Q only B P a