2024 VJC H1 Prelim P1

VICTORIA JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 1 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8867/01 20 September 2024 FRIDAY 2.30 pm to 3.30 pm (1 hour) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and Civics Group on the Answer Sheet in the spaces provided unless this has been done for you. DO NOT WRITE ON ANY BARCODES. There are thirty 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. This document consists of 16 printed pages.

2 Data speed of light in free space c = 3.00  108 m s-1 elementary charge e = 1.60  10-19 C unified atomic mass constant u = 1.66  10-27 kg rest mass of electron me = 9.11  10-31 kg rest mass of proton mp = 1.67  10-27 kg the Avogadro’s constant NA = 6.02 × 1023 mol-1 gravitational constant G = 6.67 × 10-11 N m2 kg-2 acceleration of free fall g = 9.81 m s-2 Formulae uniformly accelerated motion s = ut +( ½) at2 v2 = u2 + 2as resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2+ …

3 1. Which one of the following estimates is unrealistic? A The potential energy of a man at the top of Bukit Timah Hill is 100 kJ. B The volume of air in a classroom is 150 m3. C The mass of an apple is 100 g D The average temperature of fire is 300 K. 2. The rate of energy transfer, H through a conducting slab is found experimentally to be given by TH kA l  where the proportionality constant k is the thermal conductivity of the material, A is the cross-sectional area of the slab, l is the length of the slab and ΔT is the temperature difference at opposite faces of the slab. Which of the following are the base units of k? A kg m2 s-2 K-1 B kg m s-3 K-1 C kg m s-2 K-1 D unitless 3. Two projectiles are fired from a gun as shown in Fig. 3. Fig. 3 The first projectile leaves the gun at a velocity of 140 m s−1 at an angle to the horizontal of 75°. The second projectile is fired from the gun at the same position with the same speed but at an angle of 15°. How much time later should the second projectile be fired so that both projectiles land at the same point on the ground at the same time? Ignore the effects of air resistance. A 10 s B 15 s C 20 s D 30 s

4 4. The velocity- time graph of a particle moving in a straight line is shown in Fig. 4 Fig. 4 What are the average speed and velocity of the particle between time t = 0 and t = 14 s? Average speed / m s-1 Average velocity / m s-1 A 7.1 7.1 B 7.1 10 C 10 7.1 D 10 10 5. An aeroplane, flying in a straight line at a constant height of 500 m with a speed of 200 m s-1, drops an object. The object takes a time t to reach the ground and travels a horizontal distance d in doing so. Ignoring air resistance, which one of the following gives the values of t and d? t /s d /km A 25 10 B 25 5 C 10 5 D 10 2 t/ s v/ m s-1

5 6. A ball falls vertically and bounces on a moving conveyor belt. What is the direction of the resultant force due to the conveyor belt acting on the ball? A B C D 7. The diagram shows two opposite vertical forces of magnitude 1.2 N and 2.1 N acting on an object. Which of the following statements is wrong? A The magnitude of the resultant force is 0.9 N. B The object is accelerating and moving up. C The object is decelerating and moving up. D The object is decelerating and moving down. Direction of motion of conveyor belt

6 8. Two trolleys are placed together on a horizontal runway with a compressed spring between them. When they are released, the 2.0 kg trolley moves to the left at 2.0 m s–1. How much energy was stored in the spring? A 4.0 J B 6.0 J C 8.0 J D 12 J 9. A steel spring was stretched to a length of 58 cm when a 30 N weight was hung from it. The same spring was stretched to a length of 72 cm when a 51 N weight was hung from it. What was the original length of the spring? A 15 cm B 38 cm C 44 cm D 61 cm 10. Two blocks, one made of wood and the other of iron, are arranged at rest on the ground. Which of the following statements is correct? A The force exerted by the ground on the iron block in (1) is greater than the force exerted by the ground on the wooden block in (2) because the iron block, being denser than the wooden block, exerts more force on the ground. B The force exerted by the wooden block on the iron block in (1) is equal to that exerted by the iron block on the wooden block in (2). C The force exerted by the iron block on the wooden block in (1) is bigger than that exerted by the wooden block on the iron block in (2). D The force exerted by the wooden block on the iron block in (1) is smaller than the force exerted by the ground on the wooden block in (2). (1) (2) 2.0 kg 1.0 kg

7 11. A 1.0 m long uniform beam has a mass of 2.0 kg and has a further mass of 5.0 kg attached at the end. It is in contact with a wall on one side and is supported by a wire at an angle of 30° to the beam. The beam is in equilibrium. What is the tension, T, in the wire? A 69 N B 84 N C 110 N D 130 N 12. Which row in the table gives the gravitational potential energy, the elastic potential energy and the kinetic energy of a bungee jumper during the first fall? Air resistance is negligible. Gravitational potential energy/ kJ Elastic potential energy/ kJ Kinetic energy/kJ A top middle bottom 120 60 0 0 10 120 0 50 0 B top middle bottom 120 60 0 0 30 60 0 30 60 C top middle bottom 120 60 0 0 30 120 0 60 0 D top middle bottom 120 60 0 0 60 120 0 0 0 30° T 0.70 m 5.0 kg 130°

8 13. An escalator is 60 m long and lifts passengers through a vertical height of 30 m, as shown. To drive the escalator against the forces of friction when there are no passengers requires a power of 2.0 kW. The escalator is used by passengers of average mass 60 kg and the power to overcome friction remains constant. How much power is required to drive the escalator when it is carrying 20 passengers and is travelling at 0.75 m s-1? A 4.4 kW B 6.4 kW C 8.8 kW D 10.8 kW 14. A turntable is rotating at a constant number of revolutions per second. What is the relationship between the angular velocity of a point on the turntable and the distance of the point from the centre of the turntable? A Angular velocity is directly proportional to the distance. B Angular velocity is inversely proportional to the distance. C Angular velocity is directly proportional to the distance squared. D Angular velocity is independent of distance. 30 m 60 m

9 15. A bird is flying in a horizontal circular path at constant speed. Its wings are inclined at an angle to the horizontal as shown in the diagram. Which of the following statements about the motion of the bird is correct? A The kinetic energy of the bird is constant because no work is done. B The bird is in equilibrium because the upward lifting force on bird balances its weight. C The momentum of the