EJC 2023 J2 H2 PRELIM P1

©EJC 2023 9749/J2H2PRELIM2023 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY YEAR EXAMINATIONS 2023 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER PHYSICS Multiple Choice Questions 9749/01 22nd September 2023 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 2023 9749/J2H2PRELIM2023 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 2023 9749/J2H2PRELIM2023 [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 2023 9749/J2H2PRELIM2023 Section A – Multiple Choice Questions 1 A car and a bicycle are equal distances from a crossroads. The car is travelling north with a speed of 15 m s−1. The bicycle is travelling northwest with a speed of 5.0 m s−1. At this instant, which arrow represents the velocity of the bicycle relative to the car? A B C D car 15 m s−1 N

5 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over 2 A student attempts a long distance shot with a crushed paper ball as shown in the diagram below (not to scale). The horizontal distance between the centre of mass of the ball and the centre of the trash bin is 3.0 m, while the vertical distance between them is 0.25 m. The ball is shot at an angle of 30  above the horizontal, with an initial speed u. Which value should u be, in order for the crushed paper ball to enter the trash bin? A 5.4 m s−1 B 6.3 m s−1 C 30 m s−1 D 40 m s−1 3 Two blocks, A and B, connected by a massless rope over a smooth pulley, are on a smooth incline plane with angles of inclination as shown in the diagram. The masses of blocks A and B are 2.0 kg and 5.0 kg respectively. The two blocks are acted upon by two external forces, F1 and F2, respectively as shown in the diagram with F1 = 12 N and F2 = 20 N. What is the tension in the rope? A 21 N B 27 N C 39 N D 42 N B A F1 = 12 N F2 = 20 N 0.25 m 30 u 3.0 m

6 ©EJC 2023 9749/J2H2PRELIM2023 4 A stationary firework explodes into three pieces. The masses and the velocities of the three pieces immediately after the explosion are shown. What is the speed v1? A 4.0 m s−1 B 9.2 m s−1 C 14 m s−1 D 16 m s−1

7 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over 5 A uniform beam is freely hinged to a wall. It is held by a cable at the other end. . Its weight W acts through the centre of gravity G. What is the direction of the force by the hinge on the beam? A B C D W G cable beam wall

8 ©EJC 2023 9749/J2H2PRELIM2023 6 An object falls freely from rest. After time t, its displacement from origin is s. Which graph(s) shows the correct relationship of how gravitational potential energy E of the ball varies? (i) (ii) (iii) (iv) A (i) and (iii) only B (i) and (iv) only C (ii) and (iii) only D (ii) and (iv) only 7 A 1000 kg car travels along a road at with a constant acceleration of 0.50 m s−2. At a speed of 20 m s −1, its power output is 40 kW. The total resistive force on the car is proportional to the square of its speed. What power will be required to travel at a constant speed of 25 m s−1? A 1.8 kW B 47 kW C 59 kW D 72 kW E t 0 E t 0 E s 0 E s 0

9 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over 8 A car is driven round an icy road banked at an angle θ of 25o and a radius r of 50 m as shown. The frictional force between the tyres and the road is negligible. What is the speed that the car can travel at while maintaining the circular radius? A 2.6 m s−1 B 7.3 m s−1 C 15.1 m s−1 D 21.9 m s−1 9 An object of 3.5 kg is fixed to one end of a light rod which rotates freely in a vertical circle. The length of the rod is 7.7 m. When θ is 30o, the speed of the object is 25.0 m s−1. Assume that there is no energy loss to the surrounding. Which of the following describes the force in the rod when the object is at the top of the circular motion? A 94 N in compression B 94 N in tension C 121 N in compression D 121 N in tension

10 ©EJC 2023 9749/J2H2PRELIM2023 10 The given graph shows the isotherms obtained from a sample of real gas. The temperature T1 is the ice-point (273.15 K) and T2 is the boiling point of water at standard pressure. What is the thermodynamic temperature T3 in kelvin? A ()273.15 () xy yz − − B 273.15 x z C 273.15 100 x z+ D ()273.15 100 () xy yz −+ − 11 Some ideal gas is contained in two flasks X and Y. The flasks are connected by a tube of negligible volume that is fitted with a tap, as shown. With the tap closed, the pressure and volume of the gas in the flask X are px and Vx respectively. In flask Y, the gas has pressure pY and volume VY. The temperature of the gas in both flasks is T. The tap is opened. After some time, the temperature of the gas returns to T at pressure P and volume V. Which expression relates the pressures and the volumes before and after opening the tap once the temperature has returned to T? A x y x ypV =(p p ) (V V )×-- B x y x y 11pV = (p p ) (V V )22 + × + C x x y ypV = p V p V+ D x y x ypV =(p p ) (V V )+ × + pV / J P / Pa x y z T1 T2 T3 0 flask X flask Y px Vx pY VY tap