9749 H2 PHYSICS JC1 Promo Exam Papers 1

9749 H2 PHYSICS JC 1 PROMO EXAM PAST YEAR PAPERS 1 MEASUREMENTS KINEMATICS DYNAMICS FORCES WORK, ENERGY POWER CIRCULAR MOTION GRAVITATIONAL FIELD OSCILLATIONS TEMPERATURE & IDEAL GASES FIRST LAW OF THERMODYNAMICS WAVE MOTION NANYANG JUNIOR COLLEGE JC1 PHYSICS TEAM SCIENCE DEPARTMENT 2023

Data Formulae uniformly accelerated motion s = ut + ½at 2 v2 = u2 + 2as work done on/by a gas W = p∆V hydrostatic pressure p = ρgh gravitational potential  = /Gm r temperature T/K = T/oC + 273.15 pressure of an ideal gas p = 21 3 Nm cV mean translational kinetic energy of an ideal molecule E = 3 2 kT displacement of particle in s.h.m. x = xo sin ωt velocity of particle in s.h.m. v = vo cos ωt =  22 xxo   electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/ R = 1/ R1 + 1/R2 + … electric potential V = Q / 4πεor alternating current/voltage x = xo sin ωt magnetic flux density due to a long straight wire B = µoI / 2πd magnetic flux density due to a flat circular coil B = µoNI / 2r magnetic flux density due to a long solenoid B = µonI radioactive decay x = xo exp (-λt) decay constant λ = ln2 / t1/2 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

NYJC 2021 9749/01/J1EOY/21 [Turn over NANYANG JUNIOR COLLEGE JC 1 END-OF-YEAR EXAMINATION Higher 2 CANDIDATE NAME CLASS TUTOR’S NAME PHYSICS 9749/01 Paper 1 Multiple Choice 4 October 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and tutor’s name in the spaces at the top of this page. There are thirty questions on this paper. Answer all questions. 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. Read the instructions on the Answer Sheet very carefully. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages.

3 NYJC 2021 9749/01/J1EOY/21 [Turn over 1 Which list of quantities contains only one vector? A density, electric charge, power B speed, impulse, upthrust C current, torque, pressure D gravitational potential, moment of force, displacement 2 What is the order of magnitude of the volume of an SMRT train along the North−South line? A 101 m3 B 103 m3 C 105 m3 D 107 m3 3 A ball hits the floor with velocity u. It rebounds with velocity v which is half its initial speed. Which diagram correctly indicates the change in velocity v of the ball? A B C D 4 A stone is thrown vertically downwards from the edge of a cliff with an initial speed of 15 m s-1. Just before hitting the ground, it has a final speed of 45 m s-1. If the stone were thrown horizontally outwards from the top of the cliff with the same initial speed, what is its final speed just before hitting the ground? A 34 m s−1 B 37 m s−1 C 45 m s−1 D 48 m s−1 v u v v u v v u v v u v

4 NYJC 2021 9749/01/J1EOY/21 5 A ball was projected from the ground with a velocity v at an angle  to the horizontal. It traces a parabolic path as shown below, reaching a maximum height H after a time T and then falls back down to the ground. Air resistance may be assumed to be negligible. Which graph best shows the variation of kinetic energy Ek of the ball with time t? A B C D 6 A boy holding a ball is standing on the floor of a lift. The lift then starts accelerating from rest at 4.9 m s-2 upwards. After 2.0 s, he releases the ball at 1.2 m with respect to the floor of the lift. At the moment the ball is released, the lift comes to a sudden complete stop. What is the time taken for the ball to reach the floor of the lift? A 0.49 s B 1.1 s C 2.1 s D 3.0 s 7 Three boxes X, Y and Z with masses 3M, 2M and M respectively are stacked on top of each other on a smooth floor. A horizontal force F is applied to box X as shown, causing the boxes to accelerate rightwards together. If the friction between boxes X and Y is f1, and the friction between boxes Y and Z is f2, which of the following gives the correct ratio F : f1 : f2? A 3 : 2 : 1 B 3 : 1 : 1 C 6 : 5 : 3 D 6 : 3 : 1 v  H Ek Ek 0 t Ek 0 t Ek 0 T t t T T 0 T X Y Z

5 NYJC 2021 9749/01/J1EOY/21 [Turn over 8 Two gliders of equal mass, each fitted with a magnet, move along a linear air track without friction. They move towards each other with equal initial speeds. As they approach, the magnets repel each other. Each glider decelerates to rest, then accelerates and moves off in the opposite direction. Which statement is true throughout the whole motion? A Kinetic energy is conserved because none is converted to heat. B Kinetic energy is not conserved because neither moves at constant speed. C Momentum is conserved because no external force acts on the gliders. D Momentum is not conserved because at the instant of closest approach, both gliders are at rest. 9 A puck of mass 2m with momentum p in the x-direction is travelling along a frictionless surface of an air hockey table. It strikes the edge of another puck of mass m which is initially at rest, resulting in an elastic collision. The diagrams below show the top view of the motion of the pucks before and after the collision. Which of the following gives the correct expressions for the magnitude of the total momentum in the x-direction and kinetic energy of the pucks after the collision? Total momentum in the x-direction Total kinetic energy A p (cosθ + cos) 4 2p m B p (sinθ + p sin) 2p 2m C p 4 2p m D p 2p 2m p 2m m m 2m Before collision After collision at rest 2m 2m m m   y x

6 NYJC 2021 9749/01/J1EOY/21 10 A block of volume 1000 cm3 is attached to a newton meter by an inextensible string and is fully submerged in water of temperature 40 °C. The newton meter reads 0.149 N. The graph below shows the relationship between the density and the temperature of water. The temperature of the water is then changed. What is the new temperature of the water if the reading on the newton meter changes to read 0.321 N? A 15 C B 50 C C 75 C D 90 C 0.955 0.960 0.965 0.970 0.975 0.980 0.985 0.990 0.995 1.000 1.005 0 10 20 30 40 50 60 70 80 90 100 density / g cm-3 temperature / °C newton meter water block string

7 NYJC 2021 9749/01/J1EOY/21 [Turn over 11 Three light springs P, Q and R with spring constants kP = 2 .0 N m −1, kQ = 3 .0 N m −1 and kR = 6.0 N m−1 respectively are connected in series as shown below. When a force F = 12 N is applied as shown in the diagram above, the springs extend by xP, xQ and xR respectively. What is the ratio of the extensions xP : xQ : xR? A 1 : 2 : 3 B 2 : 3 : 6 C 3 : 2 : 1 D 6 : 3 : 2