(ACJC) 2024 J2 H2 Physics Prelim P1

This paper consists of 18 printed pages. Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 13 September 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and index number on the Answer Sheet provided. There are thirty questions in this section. 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 Question Paper. The use of an approved scientific calculator is expected, where appropriate.

2 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination DATA AND FORMULAE Data speed of light in free space, c = 3.00  108 m s−1 permeability of free space, o = 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 K−1 mol−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 [Turn over] Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination Formulae uniformly accelerated motion, s = ut + 2 1 at 2 v 2 = u 2 + 2as work done on/by a gas, W = p V hydrostatic pressure, p =  g h gravitational potential,  = − Gm r temperature T/K = T/oC + 273.15 pressure of an ideal gas p = 21 3 Nm c V  mean translational kinetic energy of an ideal gas molecule, E = 3 2 kT displacement of particle in s.h.m., x = xo sin t velocity of particle in s.h.m., v = vo cos t =   22 oxx − electric current I = Anvq resistors in series, R = R1 + R2 +  resistors in parallel, 1/R = 1/R1 + 1/R2 +  electric potential, V = 4 o Q r alternating current/voltage, x = xo sin t magnetic flux density due to a long straight wire B = 2 o d   I magnetic flux density due to a flat circular coil B = 2 oN r  I magnetic flux density due to a long solenoid B = on I radioactive decay, x = xo exp(−t) decay constant,  = 12 ln2 t

4 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 1 The maximum theoretical power P of a wind turbine is given by the equation P = k  A v n, where  is the density of air, A is the area swept by the turbine blades, v is the speed of the air and k is a constant with no units. What is the value of n? A 1 B 2 C 3 D 4 2 The graph shows the variation with time t of the displacement s of an object moving along a straight path. Which time interval has the greatest magnitude of acceleration?

5 [Turn over] Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 3 A block is released from rest down a frictionless inclined plane of angle . The block passes two light sensors S1 and S2 at time t1 and t2 respectively. What is the acceleration of free fall? A 22 21 2 () h tt − B 2 21 2 () h tt − C 22 21 2 ( )cos h tt − D 22 21 2 ( )sin h tt − 4 A toy rocket consists of a plastic bottle which is partially filled with water as shown in the figure below. The space above the water contains compressed air. At one instant during the flight of the rocket bottle, water of density 1000 kg m−3 is forced out of the nozzle of radius 0.012 m at a speed of 10 m s−1 relative to the nozzle. What is the rate of change of momentum of the water? A 45 N B 120 N C 3800 N D 7500 N nozzle compressed air water

6 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 5 Two stationary ice-skaters Charlie and Sam, each of mass 60 kg, are directly facing one another on an ice-skating rink. Charlie throws a 1.5 kg ball towards Sam with a horizontal speed of 2.5 m s−1. Sam catches the ball and throws it back to Charlie with the same horizontal speed. What is the speed of Charlie after catching the ball? A 0 m s−1 B 0.063 m s−1 C 0.12 m s−1 D 0.13 m s−1 6 A climber is supported by a light rope on a vertical wall as shown. The weight W of the climber is 520 N and the reaction force R acts at right angles to the wall. The climber is in equilibrium. Which row shows the value of the tension T in the rope and R? T / N R / N A 500 150 B 500 480 C 550 170 D 550 520

7 [Turn over] Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 7 A beam on a pivot supports a load P at one end and a load Q at the other end. The weight of the beam is negligible and the beam is maintained in a horizontal position as shown. Which row gives possible values for P and for Q? P / N Q / N A 3.0 7.0 B 49 7.0 C 21 9.0 D 27 9.0 8 A motor driving a pump raises 0.20 m 3 of water through a vertical height of 10 m in 5.0 minutes. The efficiency of the motor is 40% and the density of water is 1000 kg m−3. What is the power generated by the motor? A 26 W B 65 W C 160 W D 9800 W 9 The hour hand of a large clock is 2.5 m long. What is the average angular speed of this hand? A 1.5  10─4 rad s─1 B 3.0  10─4 rad s─1 C 1.8  10─3 rad s─1 D 1.0 × 10─1 rad s─1

8 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 10 A sphere moves in a horizontal circle with constant angular speed. What is its linear speed and its centripetal acceleration when the radius of the horizontal circle is halved and angular speed is doubled? linear speed centripetal acceleration A halved constant B halved doubled C constant constant D constant doubled 11 The figure below shows a group of three planets. The mass of Planet 2 is about 80 times that of Planet 1 while t he mass of Planet 3 is about 350 000 times that of Planet 2. The neutral point in the gravitational field is the point at which the resultant gravitational field due to the three planets is zero. (not to scale) Which position is a possible neutral point? A B C D Planet 1 Planet 2 Planet 3

9 [Turn over] Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 12 A fixed amount of an ideal gas has pressure p and volume V. The graph shows the variation of 1 p with V at a constant temperature. The amount of gas and the thermodynamic temperature are then both decreased by half. Which line shows the variation of 1 p with V?

10 Anglo-Chinese Junior College 2024 J2 H2 9749 Paper 1 Preliminary Examination 13 Thermal energy is supplied to 2.1 kg of ice at −4.5 C. All the ice becomes water at 96 C. There is no heat loss to the surroundings. Specific heat capacity of wat