(VJC) 2024 H2 Prelim P1

VICTORIA JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 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 permeability of free space µo = 4 × 10-7 H m-1 permittivity of free space o = 8.85 × 10-12 F m-1 (1/(36)) × 10-9 F m-1 elementary charge e = 1.60 × 10-19 C the Planck constant h = 6.63 × 10-34 J s 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 molar gas constant R = 8.31 J mol-1 K-1 the Avogadro constant NA = 6.02 × 1023 mol-1 the Boltzmann constant k = 1.38 × 10-23 J K-1 gravitational constant G = 6.67 × 10-11 N m2 kg-2 acceleration of free fall g = 9.81 m s-2

3 Formulae uniformly accelerated motion s = ut + (½) at2 v2 = u2 + 2as work done on/by a gas W = pV hydrostatic pressure p = gh gravitational potential GM r =− temperature o/ K / C 273.15TT =+ pressure of an ideal gas 21 3 Nmpc V= mean translational kinetic energy of an ideal gas molecule 3 2E kT= displacement of particle in s.h.m. x = xo sin  t velocity of particle in s.h.m. 0 cos tvv = 22 0x x=  − electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2+ … electric potential 04 QV r= alternating current/voltage x = xo sin  t Magnetic flux density due to a long straight wire 0 2B d I = Magnetic flux density due to a flat circular coil 0 2 NIB r = Magnetic flux density due to a long solenoid 0B nI= radioactive decay x = xoexp(-t) decay constant 1/2 ln2 t =

4 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 velocity- time graph of a particle moving in a straight line is shown in Fig. 2: Fig. 2 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 3. 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. t/ s v/ m s-1

5 4. The diagrams show a hollow metal cube, with a sealed opening, is suspended from a spring balance before and during immersion in water. A reduction in the balance reading occurs because of the immersion. Water is then allowed to enter the metal cube, through the opening, to fill up the empty space in the cube. Which of the following statements is correct? A Upthrust of the water on the cube increases, hence the balance reading will be further reduced. B The balance reading during immersion corresponds to the upthrust of the water on the cube. C The balance reading stays the same as the increase in weight of water in the cube is offset by the increase in upthrust of the water on the cube. D The balance reading increases due to the increase of gravitational pull on the cube.

6 5. 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 6. 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 30 m 60 m

7 7. 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. 8. A satellite of mass M is in circular orbit with radius r around the Earth with a period of T. A second satellite of mass 2 M moves around the Earth with radius 4 r. What is the period of this second satellite in terms of T? A 4 T B 2 T C 4 T D 8 T 9. What is the approximate number of atoms in a cubic metre of an ideal monatomic gas at the temperature of 27 C and a pressure of 1 x 105 Pa? A 1 x 1022 B 6 x 1023 C 2 x 1025 D 3 x 1026 10. A fixed mass of monatomic ideal gas at a volume V at temperature T and pressure P has a root mean square speed c. After absorbing heat, its final volume is V and final pressure is 2P. What is the new root mean square speed of the ideal gas? A 0.5 c B 0.71 c C 1.4 c D 2.0 c 11. An ideal gas is confined in a cylinder fitted with a frictionless piston. When 90 J of heat is supplied and the gas is allowed to expand 2.5 x 10 -4 m3 in volume at a constant pressure of 2.0 x 105 Pa, the temperature rises by 4.5 K. What is the increase in internal energy during this process? A 40 J B 50 J C 90 J D 140 J

8 12. The graph below shows the variation with time of the velocity of a 5.0 kg oscillating mass. What is the maximum restoring force acting on the mass as it oscillates? A 0.041 N B 0.050 N C 0.079 N D 0.15 N 13. An object of mass m oscillates in simple harmonic motion between two spring s as shown below. The amplitude of the motion is xo. What is the ratio elastic potential energy of the two springs kinetic energy of the object when the object is xo 2 from its equilibrium? A 1 3 B 1 2 C 1 D 3

9 14. X and Y are two points on the surface of water in a ripple tank. A source of constant frequency generates a wave which travels past X and Y, causing them to oscillate vertically. What is the phase difference between X and Y? A 45° B 135° C 180° D 270° 15. A point source of sound emits energy equally in all dir