ACJC 2025 J2 H2 Physics Prelim P1

This paper consists of 20 printed pages. Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 19 September 2025 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 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 Question Paper. The use of an approved scientific calculator is expected, where appropriate.

2 Anglo-Chinese Junior College 2025 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 2025 J2 H2 9749 Paper 1 Preliminary Examination Formulae uniformly accelerated motion s = 21 2ut at+ 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 = 0 2 d   I magnetic flux density due to a flat circular coil B = 0 2 N r  I magnetic flux density due to a long solenoid B = 0n I radioactive decay x = xo exp(−t) decay constant  = 1 2 ln2 t

4 Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 1 A moving object enters a uniform field of force at M, travels at constant speed and exits the field at N as shown. Which arrow best represents the direction of the change in velocity of the object from M to N? A B C D 2 An object is thrown vertically upwards in air. The times for the upward motion tu and the downward motion td to return to the same height are compared. Which statement is correct? A td is greater because at a given speed the resultant force when the object is moving downwards is smaller than the retarding force when it is moving upwards. B td is greater because the object moves faster on its downward motion and therefore the air resistance is greater. C tu is greater because at a given speed, the resultant force when the object is moving downwards is greater than the retarding force when it is moving upwards. D tu is greater because the object moves faster on its downward motion due to gravitational force acting in the same direction as its motion.

5 [Turn over] Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 3 A transport system used to move luggage from the airport terminal to the aircraft consists of a powered vehicle connected to four baggage carts by a series of connecting bars. The mass of each of the baggage carts is 400 kg and th e system starts with an acceleration of 2.0 m s–2. Ignore any frictional forces on the carts. What is the tension in the connecting bar between baggage carts 2 and 3? A 400 N B 800 N C 1200 N D 1600 N 4 A small ball P moves with speed v towards another identical ball Q along a line joining the centres of the two balls. Ball Q is at rest initially and they collide elastically. Which of the following shows the final velocities of the balls? A B C D

6 Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 5 A small object of mass m is launched by a spring and travels along a rough track to a point P as shown. The spring constant of the spring is k and its initial compression is x. As it travels to P, it goes through a distance d and a dip of depth H. The object experiences a constant frictional force f for the entire motion. What is the kinetic energy of the object at point P? A 21 2 kx fd− B 21 2 kx fd mgH−− C 21 2 kx fd+ D 21 2 kx fd mgH++

7 [Turn over] Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 6 A pail of water is spun vertically in a circular motion with a radius of 1.3 m as shown. The mass of water is 0.52 kg and the speed of the pail at the bottom of the circle is 9.3 1m s .− What is the normal contact force acting on the water at the bottom of the circle? A 5.1 N B 30 N C 35 N D 40 N

8 Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 7 Two identical 30 kg point masses X and Y are placed 20 m apart as shown. P is a point 10 m perpendicular to the midpoint between X and Y. What is the resultant gravitational field strength g and gravitational potential ϕ at P? g / N kg−1 ϕ / J kg−1 A 111.4 10 − 102.8 10 −− B 111.4 10 − 0 C 112.0 10 − 102.8 10 −− D 112.0 10 − 0 8 A satellite orbits a planet at a distance r from its centre. Its kinetic energy is 3.2 MJ. Another identical satellite orbits the planet at a distance 2r from its centre. What is the gravitational potential energy of this second satellite? A − 0.80 MJ B − 1.6 MJ C − 3.2 MJ D − 6.4 MJ P X Y 20 m 10 m

9 [Turn over] Anglo-Chinese Junior College 2025 J2 H2 9749 Paper 1 Preliminary Examination 9 An isolated container is divided into two sections of equal volumes by a partition. The ideal gas in each section has the same pressure P. What is the final pressure after the partition is removed? A 1 2 P B P C 3 2 P D 2P 10 A fixed volume container contains a mixture of two monatomic gases X and Y at the same temperature. The mass of the molecules of X is twice that of molecules of Y. What is the ratio root mean square speed of molecules of X root mean square speed of molecules of Y ? A 0.50 B 0.71 C 1.4 D 2.0 11 A fixed mass of gas undergoes a change from state X to Y via two different paths as shown. In path 1, 4.0 J of work is done by the gas and there is a thermal transfer of 10 J of energy into it. In path 2, 2.0 J of work is done by the gas. What is the thermal transfer of energy into the gas in path 2? A 4.0 J B 8.0 J C 12 J D 16 J

10 Anglo-Chinese Junior College