2024 SCGS Prelim P1

SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER PHYSICS 6091/1 (Revised) Tuesday 27 August 2024 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 21 printed pages and a blank page.

2 1 A lump of modelling clay is moved from a small measuring cylinder to a large measuring cylinder that has twice the diameter. The reading on the small measuring cylinder goes down by 20 cm3 . By how much does the reading on the large cylinder go up? A 10 cm3 B 20 cm3 C 40 cm3 D 80 cm3 2 An object is moved from point X to point Y. The acceleration of free fall at X is different from that at Y. Which statement about the object at Y is correct? A Both its mass and its weight are different from those at X. B Both its mass and its weight are the same as those at X. C Its mass is the same as at X but its weight is different. D Its weight is the same as at X but its mass is different.

3 3 An object hangs by means of two cords around two rods, as shown. The object is held in equilibrium by the forces F1 and F2. The object weighs 10 N. There is negligible friction between the rods and cords. Angle θ is 90°. Which row of the table gives an angle θ of 90°? 4 Two objects travel from P to R along two routes as shown. One moves along route A while the other along route B. Both reach R at the same time. Which statement about the two objects is correct for the journey from P to R? A They have the same average speed. B They have the same average velocity. C They have different displacement. D They travel the same distance. Route A Route B

4 5 A rock is launched vertically upwards from the surface of the Earth and an identical rock is launched vertically upwards from the surface of Mars. Each rock is launched with an initial velocity of 12 m s–1. Each rock then reaches its maximum height above the surface before returning back down to the surface. The velocity–time graph for each rock is shown. In both cases, air resistance is negligible. What is the difference in the maximum heights of the two rocks? A 12 m B 15 m C 19 m D 24 m 6 A radio-controlled toy car travels along a straight line for a time of 15 s. The variation with time t of the velocity v of the car is shown. What is the average velocity of the toy car for the journey shown by the graph? A –1.5m s –1 B 0.0 m s –1 C 4.0 m s –1 D 4.5 m s –1

5 7 Each diagram illustrates a pair of forces of equal magnitude. Which diagram gives an example of a pair of forces that is described by Newton’s third law of motion? 8 Objects with different masses are placed on the horizontal surface of a table. The objects are then raised to different heights above the table. The gain in gravitational potential store of each object is the same. Which graph best shows the variation of the height h of the objects above the table with their mass m?

6 9 An airport has a mechanical system for moving luggage. The system uses a sloping conveyor belt, a horizontal conveyor belt, a lift and a frictionless slide. A suitcase is moved around the airport using this system. Resistive forces opposing the motion of the suitcase are negligible. For which movement of the suitcase is the net work done on the suitcase greatest? A moving the suitcase a distance of 8 m at a constant speed up the sloping conveyor belt B moving the suitcase a distance of 16 m at a constant speed along the horizontal conveyor belt C moving the suitcase a distance of 10 m at a constant speed vertically upwards on the lift D moving the suitcase a distance of 12 m at increasing speed downwards on the slide 10 The force diagram shows an aircraft accelerating to the right. At the instant shown, the velocity of the aircraft is 40 m s–1 . At which rate is its kinetic store increasing? A 2.4 MW B 8.0 MW C 12 MW D 20 MW

7 12 The diagram shows a balancing toy pivoted on a triangular stand. When the toy is tilted slightly, it remains stationary at the new position. Where is the centre of gravity of the balancing toy? 11 A box of length 12 cm and weight 0.43 N is placed on a horizontal table, with a greater part of its length overhanging the edge of the table. The edge of the table acts as a pivot. The centre of gravity of the box is at its geometric centre. To balance the box, a uniform sphere of diameter 2.4 cm is placed at one end of the box as shown. What is the minimum weight of the sphere required to maintain the system in equilibrium? A 0.65 N B 1.0 N C 1.3 N D 2.2 N

8 13 A piston of mass 4.0 kg is supported by gas trapped in a cylinder. The pressure of the gas is 1.2 × 105 Pa and atmospheric pressure is 1.0 × 105 Pa. The acceleration of free fall is 10 m/s2. What is the area over which the gas exerts a pressure on the piston? A 2.0 x 10-4 m2 B 2.0 x 10-3 m2 C 5.0 x 102 m2 D 8.0 x 105 m2 14 The diagram shows a working barometer. Which change would NOT cause the height h of the mercury column to vary? A Adding mercury to the trough. B Change in gravitational field strength. C Change in the temperature. D Leakage of air into the tube.

9 15 A fixed mass of helium gas is compressed to a smaller volume at constant temperature. How do these properties of the gas molecules change? Average speed of the gas molecules Frequency of collisions with the walls of the container A increases increases B increases remains unchanged C remains unchanged increases D remains unchanged remains unchanged 16 As air is sucked from a straw out of a sealed packet drink at constant temperature, the packet shrinks in volume. Which statement explains why the packet drink shrinks in volume? A The number of air molecules per unit volume in the packet drink has decreased and the force for each collision has decreased. B The number of air molecules per unit volume in the packet drink has decreased and the frequency of collisions of the air molecules on the packet wall has decreased. C The partial vacuum created in the packet drink produce a force that pulls at the walls of the packet drink inwards. D The surrounding atmospheric pressure increases and crushes the packet drink.

10 17 Which statement correctly