EJC 2025 J2 H2 PRELIM P1

©EJC 2025 9749/J2H2PRELIM2025 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY YEAR EXAMINATIONS 2025 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 4 - REGISTRATION NUMBER PHYSICS Multiple Choice Questions 9749/01 September 2025 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 21 printed pages and 3 blank pages.

2 ©EJC 2025 9749/J2H2PRELIM2025 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 2025 9749/J2H2PRELIM2025 [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 2025 9749/J2H2PRELIM2025 Section A – Multiple Choice Questions 1 A copper pipe has a true diameter of 42.03 mm. A builder measures the diameter of the pipe five times using digital calipers. The measurements are shown in the table. diameter / mm 48.12 47.99 48.01 48.00 46.80 What describes the builder’s measurements? A accurate and precise B accurate but not precise C not precise and not accurate D precise but not accurate 2 A person, travelling on a motorway a total distance of 200 km, travels the first 90 km at an average speed of 80 km h–1. Which average speed must be obtained for the rest of the journey if the person is to reach the destination in a total time of 2 hours 0 minutes? A 110 km h–1 B 120 km h–1 C 122 km h–1 D 126 km h–1

5 ©EJC 2025 9749/J2H2PRELIM2025 [Turn over 3 A lamp is suspended in equilibrium from a fixed support by three long identical wires. The weight of the lamp causes each wire to have an extension of 0.40 cm. The height h of the lamp above the floor is measured. The middle wire suddenly breaks and the lamp falls a small distance as the extensions of the remaining two wires increase. The wires obey Hooke’s law. When the lamp is in equilibrium, the height h of the lamp above the floor is measured again. What is the difference between the two values of h? A 0.20 cm B 0.27 cm C 0.40 cm D 0.60 cm

6 ©EJC 2025 9749/J2H2PRELIM2025 4 Two blocks, of mass 0.20 kg and 0.50 kg, are connected by a light inextensible string that passes over a frictionless pulley. The blocks are initially held stationary. The block of mass 0.20 kg rests on a rough horizontal surface. The block of mass 0.50 kg is suspended in air. Air resistance is negligible. When the blocks are released, the kinetic frictional force between the block of mass 0.20 kg and the rough surface is 3.5 N. What is the magnitude of the acceleration of the masses? A 2.0 m s–2 B 2.8 m s–2 C 3.9 m s–2 D 7.0 m s–2

7 ©EJC 2025 9749/J2H2PRELIM2025 [Turn over 5 A snooker ball of mass 0.20 kg has a collision so that its direction of movement changes by an angle of 90°, as shown. The ball has a speed of 0.40 m s –1 before the collision and a speed of 0.30 m s –1 after the collision. What is the magnitude of the change in momentum of the snooker ball? A 0.020 kg m s–1 B 0.10 kg m s–1 C 0.14 kg m s–1 D 0.50 kg m s–1 6 A camera drone of mass 1.20 kg hovers at a fixed point above the ground. The drone has four propellers. In a time of 1.00 s, each propeller pushes a mass of 0.400 kg of air vertically downwards. Assume that the air above the propellers is stationary. What is the speed of the air leaving each propeller? A 0.750 m s–1 B 3.00 m s–1 C 7.36 m s–1 D 29.4 m s–1

8 ©EJC 2025 9749/J2H2PRELIM2025 7 A firework is initially stationary. It explodes into three fragments A, B and C that move in a horizontal plane, as shown in the view from above. Fragment A has a mass of 3m and moves away from the explosion at a speed of 4.0 m s–1. Fragment B has a mass of 2m and moves away from the explosion at a speed of 6.0 m s−1 at right angle to the direction of A. Fragment C has a mass of m and moves away from the explosion at a speed v and at an angle θ as shown. What is the angle θ ? A 30o B 45o C 60o D 70o

9 ©EJC 2025 9749/J2H2PRELIM2025 [Turn over 8 A steel ball is falling at constant speed in oil. Which graph shows the variation with time of the gravitational potential energy Ep and the kinetic energy Ek of the ball?

10 ©EJC 2025 9749/J2H2PRELIM2025 9 A vehicle of mass 1000 kg travels at a constant velocity of 6.5 m s–1 up a 45o incline. The input power to the engine of the car is 80 kW. The efficiency of the engine is 60%. What is the resistive force on the car? A 450 N B 5400 N C 7400 N D 14 kN 10 A steel sphere is set in motion so that it is moving in a horizontal circle at constant speed with a radius r, as shown below. The distance from the centre of the sphere to the top of the spring is 10.8 cm and the spring is tilted at 27° from the vertical. What is the period of the circular motion of the sphere? A 0.62 s B 7.9 s C 6.2 s D 79 s