(EJC) 2024 J2 H2 PRELIM QP P1

©EJC 2024 9749/J2H2PRELIM/2024 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIM EXAMINATIONS 2024 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 3 - REGISTRATION NUMBER PHYSICS Multiple Choice 9749/01 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. The use of an approved scientific calculator is expected where appropriate. Answer all questions. There are thirty questions in this section. 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. 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. This document consists of 20 printed pages.

2 ©EJC 2024 9749/J2H2PRELIM/2024 Data speed of light in free space, ( )( ) 81 71 0 12 1 0 91 19 34 27 31 e 27 p 11 23 1 A 23 1 10 m s 10 H m 10 F m 10 F m 10 C 6 63 10 J s 1 3 00 4 8 85 1 36 1 60 9 11 1 67 66 10 kg 10 kg 10 kg J K mol 6 02 10 8 31 1 38 mol 10 J K c. . / e h. u. m m . . . R. N k . . G    − −− −− −− − − − − − −− − −−      = = = =   = = = = = = = =  11 2 2 2 10 N m kg m 67 81 s 6 9 . g. −− − = =  permeability of free space, permittivity of free space, elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, molar gas constant, the Avogadro constant, the Boltzmann constant, gravitational constant, acceleration of free fall,

3 ©EJC 2024 9749/J2H2PRELIM/2024 [Turn over Formulae uniformly accelerated motion, ( ) ( ) 2 22 2 0 0 22 0 12 12 0 0 0 0 0 0 1 2 1 2 2 / K / C 273 15 1 3 3 2 sin cos 1 1 1 4 sin 2 2 exp ln2 at u as V p gh Gm r T T . Nmpc V kT x x t v v t xx R / R / R / R QV r x x t B d NB r s ut v Wp t E Bn t Anvq RR xx              =+  = =− =  + = = = = − ++ = + + = = = = = − = =+ = = = = = I I I I work done on/by a gas, hydrostatic pressure, gravitational potential, temperature, pressure of an ideal gas, mean translational kinetic energy of an ideal gas molecule displacement of particle in s.h.m. velocity of particle in s.h.m. electric current, resistors in series, resistors in parallel, electric potential, alternating current/voltage, magnetic flux density due to a long straight wire magnetic flux density due to a flat circular coil magnetic flux density due to a long solenoid radioactive decay, decay constant

4 ©EJC 2024 9749/J2H2PRELIM/2024 1 A radio aerial of length L, carrying a current I, emits a signal of wavelength  and power P. These quantities are related by Pk= I2 2 L    where k is a constant. What unit, if any, should be used for the constant k? A ohm B watt C volt D no unit 2 A ball is thrown vertically upwards and returns along the same path. The graph shows how its height from the ground varies with time. Which velocity-time graph best describes this motion? A B C D t1 t2 height time 0 velocity time t1 t2 velocity time t1 t2 velocity velocity time time t1 t2 t1 t2 0 0 0 0

5 ©EJC 2024 9749/J2H2PRELIM/2024 [Turn over 3 Ball A is projected horizontally with an initial velocity 2 v from a height h above ground, while ball B is projected horizontally with an initial velocity v from a height 2h above ground. If xA is the horizontal displacement of ball A from the point of projection to the point of landing and xB is the corresponding quantity for ball B, what is the ratio A B x x ? A 0.35 B 1.00 C 1.41 D 2.83 4 Three blocks X, Y and Z, of masses m, 3m and 4m respectively, are accelerated along a smooth horizontal surface by a force F applied to block X as shown. What is the ratio force exerted on block X by block Y force on block Y by block Z ? A 1 4 B 3 8 C 7 8 D 7 4 m 3m 4m F A A 2v h A B v 2h X Y Z

6 ©EJC 2024 9749/J2H2PRELIM/2024 5 A wooden block of density 800 kg m −3 and volume 1.0 m 3 is fastened to the bottom of a freshwater pond by a string as shown below. The density of the freshwater is 1000 kg m−3. If the string suddenly breaks, what is the initial acceleration of the block? A 0.25 m s−2 B 1.25 m s−2 C 2.5 m s−2 D 12.5 m s−2 6 A small ring, of mass m, moves along a smooth circular track in the vertical plane, as shown in the figure below. P is the centre of the circular track. The radius of the track is 1.0 m. At the bottom of the track, an upward normal force of magnitude 5.5mg acts on the small ring. Which row correctly describes the magnitude and direction of the normal force acting on the small ring when it is at the top of the track? magnitude direction A 0.5mg upwards B 0.5mg downwards C 1.5mg upwards D 1.5mg downwards small ring circular track small ring P wooden block string fresh water

7 ©EJC 2024 9749/J2H2PRELIM/2024 [Turn over 7 The diagram shows the variation with displacement s of the net force F acting on an object moving along a straight line. The intial velocity of the object is zero. Which graph shows the variation with displacement s of the kinetic energy (KE) of the object? A B C D 8 The radius of the Earth is 6.371  106 m. The gravitational field strength on the surface of the Earth is 9.81 N kg−1. What is the gravitational potential at a point 80 000 m above the Earth surface? A −5.0 kJ kg−1 B −5.0 MJ kg−1 C −62 MJ kg−1 D −62 GJ kg−1 KE KE s s s1 s2 s3 s1 s2 s3 F s s1 s3 s2 0 0 0 s s1 s2 s3 KE KE s s1 s2 s3 0

8 ©EJC 2024 9749/J2H2PRELIM/2024 9 Earth has a radius of r. A satellite of mass m is in circular orbit around Earth, at a height r above the Earth and with a period T. The satellite is moved to a new orbit with height 3r above the Earth. What is the new period in terms of T? A 2 T B 22 T C 3 T D 33 T 10 The displacement x of a molecule undergoing simple harmonic motion in a sound wave is given by 0 sin2 ftxx = where x0 = 0.32 mm and f = 10 000 Hz. What is the magnitude of the maximum acceleration experienced by the molecule? A 220.1 m s− B 422.01 10 m s − C 621.26 10 m s − D 921.26 10 m s −

9 ©EJC 2024 9749/J2H2PRELIM/2024 [Turn over 11 Two oscillating systems P and Q are of the same natural frequency. They are given the same initial displacement before being released. The graphs below show the variation with time t of their displacement x. P and Q are then subjected to driving forces of the same constant amplitude and of variable frequency f. Which graph best represents the variation with f of the amplitude A of P and Q? A B C D A f 0 P Q A f 0 P Q A f 0 P Q A f 0 Q P x x P Q t t

10 ©EJC 2024 9749/J2H2PRELIM/2024 12 A liquid is maintained at boiling point by means of an electric heater. The constant rate at which the liquid boils is measured for two different powers of the heater as shown. power of heater rate of loss of mass of liquid P1 m1 P2 m2 For each power of the heater, P1 or P2, the rate of heat loss to the environment is the same. Which expression is the correct expression for rate of heat loss to the environment? A 12 21 P - P m - m B 12P - P C 1 1 P m D 1 2 2 1 21 P m P m mm − − 13 An ideal gas undergoes a cycle of changes A → B →