EJC 2023 J2 H2 PRELIM P2

©EJC 2023 9749/J2H2PRELIM2023 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS 2023 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER PHYSICS Structured Questions 9749/02 14th September 2023 2 hours 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. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue or correction fluid. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 27 printed pages and 5 blank pages. For Examiner’s Use Q1 9 Q2 7 Q3 11 Q4 9 Q5 9 Q6 9 Q7 6 Q8 20 s.f. P2 Total 80

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 1 (a) The diameter of a marble is measured using a vernier cal liper and three sets of measurements are obtained as shown in Table 1.1. The true value of the diameter of the marble is 1.52 cm. Table 1.1 diameter of marble / cm Set A 1.52 1.49 1.43 1.52 1.55 Set B 1.42 1.45 1.43 1.51 1.58 Set C 1.45 1.56 1.47 1.53 1.46 (i) State and explain which set of measurements is the most precise. [2] …………………………………………………………………………………………….... …………………………………………………………………………………………….... …………………………………………………………………………………………….... (ii) State and explain which set of measurements is the most accurate. [2] …………………………………………………………………………………………….... …………………………………………………………………………………………….... ……………………………………………………………………………………………...

5 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over BLANK

6 ©EJC 2023 9749/J2H2PRELIM2023 (b) Two cars A and B are travelling on a straight level road. Car A is 500 m ahead of Car B at t = 0 s. The velocity -time graph for cars A and B in the first 15 s are shown in Fig . 1.2 below. Fig. 1.2 (i) Sketch the corresponding displacement-time graph and acceleration-time graph of car B in the graphs provided in Fig. 1.3. For the displacement-time graph, label the displacement at 15 s on the axis. For the acceleration-time graph, label all accelerations on the axis. Fig. 1.3 [2] 90 80 60 25 velocity / m s−1 time / s 0 6.0 15 Car A: Car B: 4.0

7 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over (ii) Find the minimum distance between the two cars within the first 15 s. distance = …………………… m [3] [Total: 9]

8 ©EJC 2023 9749/J2H2PRELIM2023 2 (a) State the two conditions necessary for the equilibrium of a body which is acted upon by a number of forces. 1. ……...……………………………………..………….…………………………….................... …..……………………………………………………….…………………………….................... 2. ..……………………………………………………….…………………………….................... ………..……………………………………………………….……………………………….... [2]

9 ©EJC 2023 9749/J2H2PRELIM2023 [Turn over (b) A uniform rod of weight 80 N is supported by a wall hinge at one end and a cable at the other end, as shown in Fig. 2.1 . It makes an angle of 60 o with the wall and 50 o with the cable. Determine the tension in the cable and the force R on the rod by the wall hinge. Fig. 2.1 tension = …………………………………… N magnitude of force R = ……………………………………….. N direction of force R from the wall surface = ………..………………….………………… [5] [Total: 7]

10 ©EJC 2023 9749/J2H2PRELIM2023 3 A small magnet X of mass 30 g is released from rest on the top of a smooth slope of length 1.50 m inclined at 40° as shown in Fig. 3.1. Another small magnet Y was placed at rest on a smooth horizontal surface a long distance away from the slope. Fig. 3.1 (a) Calculate the speed of magnet X as it reaches the bottom of the slope after being released. speed of X = …………….………….. m s−1 [1] (b) The two magnets X and Y were positioned with like poles facing each other. Magnet X reaches a point of closest approach with magnet Y before changing direction and going towards the slope. It stopped 0.80 m up the slope. Assume that the collision is elastic. (i) Calculate the final speed of magnet Y. speed of Y = …………….……..…… m s−1 [3] 40° Y