RVHS H2 Physics P1 QP

River Valley High School Pg 1 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 RIVER VALLEY HIGH SCHOOL JC2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 PAPER 1 22 SEP 2023 1 HOUR CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 2 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Read these notes carefully. Write your name, class and index number above. 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 shade your choice in soft pencil on the separate Optical Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on the Question Paper. The use of an approved scientific calculator is expected where appropriate. Hand in the Optical Answer Sheet. _________________________________________________________________________ This document consists of 18 printed pages.

River Valley High School Pg 2 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 Data speed of light in free space, c = 3.00 × 108 m s–1 permeability of free space, µO = 4π × 10–7 H m–1 permittivity of free space, εO = 8.85 × 10–12 F m–1 (1/(36π )) × 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

River Valley High School Pg 3 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 Formulae uniformly accelerated motion 21 2s ut at= + 22 2v u as= + work done on/by a gas W pV= ∆ hydrostatic pressure p ghρ= gravitational potential rGm− =φ temperature T / K = T / °C + 273.15 pressure of an ideal gas > < =2 3 1 cV N mp mean translational kinetic energy of an ideal gas molecule 3 2E kT= displacement of particle in s.h.m. t x xωsin0= velocity of particle in s.h.m. t v vω =cos0 22 0 x x− ω ± = electric current Anvq=Ι resistors in series 12RR R=++  resistors in parallel 121/ 1/ 1/RR R=++  electric potential r QV 04πε= alternating current/voltage t x xωsin0= magnetic flux density due to a long straight wire dB π µ 2 0 I= magnetic flux density due to a flat circular coil r NB 2 0 Iµ= magnetic flux density due to a long solenoid In B0µ= radioactive decay )exp(0 t x xλ − = decay constant 2 1 2ln t=λ

River Valley High School Pg 4 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct and shade your choice in soft pencil on the separate Answer Sheet. 1 The initial velocity of an object is shown by the vector x. The final velocity of the object is shown by the vector y. Which arrow best shows the change in velocity of the object? 2 The table below shows the estimates of some physical quantities. Which row is not a reasonable estimate? quantity value A power consumption of a domestic aircon turned on for 8 hours 20 kW B total surface area of an adult human 2 m2 C kinetic energy of an Olympic sprint runner 5000 J D pressure at the bottom of a public swimming pool 10 kPa y B C D

River Valley High School Pg 5 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 3 The figure shows the variation of speed v with displacement y of a ball tossed directly upwards. The distance between yA and yB is 0.40 m. The speed at height yA is vA and the speed at yB is vA 3 . What is speed vA ? A 2.6 m s−1 B 2.7 m s−1 C 3.0 m s−1 D 8.9 m s−1 4 A particle X, with kinetic energy Ek, collides with a stationary particle Y. Both particles have the same mass. After colliding, X and Y travel together as a single larger particle. How much kinetic energy is lost in the collision? A 0 B Ek 4 C Ek 2 D 3Ek 4 y v 0 yA 0.40 m yB vA vA 3

River Valley High School Pg 6 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 5 The figure shows a car accelerating down a slope, going from rest to 30 m s−1 in 6.0 s. The slope is angled at θ above the horizontal. During the acceleration, a ball hangs by a string from the car’s ceiling. The acceleration is such that the string remains perpendicular to the ceiling. What is the angle θ ? A 0 B 27o C 31o D 59o 6 A diving board of length 5.0 m is hinged at one end and supported 2.0 m from this end by a spring of spring constant 10 kN m –1. A child of mass 40 kg stands at the far end of the board. What is the extra compression of the spring caused by the child standing on the end of the board? A 1.0 cm B 1.6 cm C 9.8 cm D 16 cm

River Valley High School Pg 7 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 7 A mass of weight 3.8 N is suspended on a spring of unstretched length 14.2 cm and spring constant 181 N m−1. The length of the spring is 16.3 cm as shown in (a). An additional force F then extends the spring so that its length becomes 17.8 cm as shown in (b). (a) (b) What is the work done by F? A 0.057 J B 0.020 J C 0.077 J D 0.13 J 8 A car of mass 800 kg is moving at 20 m s−1 along a horizontal road. The total resistive force acting on the car is 200 N. It begins to accelerate at 0.50 m s−2. What is the total output power developed by the car at its initial acceleration? A 2.0 kW B 4.0 kW C 8.0 kW D 12 kW fixed point fixed point 16.3 cm 17.8 cm 3.8 N 3.8 N F

River Valley High School Pg 8 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 9 Point S is a point on a car tyre rotating at a constant rate as shown in the diagram. Which graph best represents the magnitude of the centripetal acceleration of point S as a function of time? A B C D 10 A heater in an electric kettle has a power of 2400 W. When the water in the kettle is boiling at a steady rate, the mass of water evaporated in 120 seconds is 0.106 kg. What is the rate of loss of thermal energy to the surrounding during the boiling process? Take latent heat of vaporisation of water to be 2.26 × 106 J kg−1. A 400 W B 4400 W C 48000 W D 53000 W centripetal acceleration centripetal acceleration centripetal acceleration centripetal acceleration time time time time

River Valley High School Pg 9 of 18 H2 Physics 9749 JC 2 Preliminary Examinations 2023 11 The number of hydrogen molecules per cm 3 in a container is 6.80 ×1015. The root-mean- square speed of the mol ecules is 1.90 × 103 m s−1. The mass of one mole of hydrogen molecule is 2.02 g. What is the pressure exerted by the gas in the container? A 0.014 Pa B 26 Pa C 27 Pa D 82 Pa 12 An air bubble of volume 20 cm3 is at the bottom of a lake 40 m deep where the temperature is 4.0 oC. The bubble rises to the surface which is at a temperature of 20 oC. Take the temperature of the bubble’s air to be the same as that of the surrounding water. Take the atmospheric pressure to be 1.0 ×105 Pa and density of water to be 1.2 g cm−3. What is the volume of the bubble as it reaches the surface? A 3.7 cm3 B 100 cm3 C 120 cm3 D 570 cm3 13 Taking the Earth to be a perfect sphere of uniform density rotating about its polar axis, which of the following statements concerning the observed acceleration due to free fall a at the surface o