EJC 2021 J1 H2 Promo P1 QP

©EJC 2021 9749/01/J1H2Promo/2021 [Turn over EUNOIA JUNIOR COLLEGE JC1 PROMOTIONAL EXAMINATIONS 2021 General Certificate of Education Advanced Level Higher 2 PHYSICS Paper 1 Multiple Choice 9749/01 September/October 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction fluid. Write your name, civics group and registration number on the Answer Sheet in the spaces provided. 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 15 printed pages and 1 blank page.

2 ©EJC 2021 9749/01/J1H2Promo/2021 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 2021 9749/01/J1H2Promo/2021 [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 2021 9749/01/J1H2Promo/2021 1 A particular classroom is of dimensions 18 m by 9.5 m by 4.0 m. How many standard Rubik’s Cubes can the classroom approximately contain? A 103 B 106 C 109 D 1012 2 The speed v of surfaces waves of wavelength  on a liquid of density  is given by 2 2 bav    where a is a constant and b is a quantity that characterises the liquid. Which of the following correctly indicates the SI base units for a and b? units of a units of b A 0 5 1m s.  0 5 2 1kg m s.  B 2m s 2kg s C 22m s  0 5 2 1kg m s. D 2m s 2kg m 3 The measurements and the associated uncertainties of a spherical object are given below diameter: 0 01 c1 85 m..  mass: 01 16 g2 . . What is the uncertainty of density as determined from the above measurements? A  33 80 0 02 g cm.. B  33 80 0 05 g cm.. C  33 80 0 06 g cm.. D  33 8 0 1 g cm..

5 ©EJC 2021 9749/01/J1H2Promo/2021 [Turn over 4 A rock is released from rest at a great height in air and falls due to gravity. Each of the three graphs shown below represents the variation with time of one of the three variables h, j and k. Which of the following correctly identifies the three variables h, j and k? h j k A displacement velocity acceleration B acceleration displacement velocity C velocity displacement acceleration D velocity acceleration displacement 5 A ball is thr ew with an initial speed of 10 m s-1 at an elevation angle of 30  from the horizontal towards a tall vertical wall that is 3.5 m away. At what distance above its initial position does the ball hit the wall? A 0.40 m B 0.50 m C 1.2 m D 5.1 m h time j time k time (not to scale) 3.5 m 30 10 m s-1 wall

6 ©EJC 2021 9749/01/J1H2Promo/2021 6 Two objects P and Q have the same volume. They are both hung suspended from either ends of a light uniform rod and submerged in liquids X and Y respectively. The density of X is less than that of Y. The rod is horizontal when suspended from a string attached at the centre of the rod. Which object has the smaller mass? A P B Q C P and Q have the same mass D insufficient information to tell 7 A parachutist leaves an aircraft and falls without significant drag for 3.0 s before opening the parachute. Which of the following best shows the variation of vertical acceleration a with time t? A B C D a t / s 3 a t / s 3 a t / s 3 a t / s 3 P X Q Y

7 ©EJC 2021 9749/01/J1H2Promo/2021 [Turn over 8 A block and a sphere of equal mass m are placed on an inclined plane. The maximum frictional force between the block and the plane has the same magnitude as the weight of the block. There is no frictional force between the sphere and the plane. What is the maximum angle  at which the plane can be inclined before the block starts to slip? A 30 B 45 C 60 D 90 9 Particle X has kinetic energy E and momentum p. It undergoes a perfectly inelastic collision, head-on with particle Y which has the same mass and that is initially at rest. Which of the following correctly represents the kinetic energies and momenta after the collision? kinetic energy of X total kinetic energy of system momentum of X total momentum of system A 0 0 0 0 B 0 E 0 p C 4 E 2 E 4 p 2 p D 4 E 2 E 2 p p 10 The rotor blades of a helicopter pushes air vertically downwards at a speed of 15 m s-1, with a mass flow rate of 2500 kg s-1. The helicopter rises with constant acceleration of 12.5 m s-2. What is the mass of the helicopter? A 1680 kg B 2500 kg C 3000 kg D 3750 kg  block sphere

8 ©EJC 2021 9749/01/J1H2Promo/2021 11 A car driver keeps his steering wheel centred and depresses his accelerator pedal fully when the traffic lights turn green. The resultant horizontal force acting on the car varies with time as shown. Which graph shows the variation with time of the speed of the car? A B C D 12 A cannon of mass 1000 kg initially at rest, fires a cannon ball of mass 10 kg. The cannon recoils with a horizontal speed of 5.0 m s-1. What is the horizontal speed of the cannon ball? A 200 m s-1 B 500 m s-1 C 2000 m s-1 D 5000 m s-1 speed time 0 0 speed time 0 0 speed time 0 0 speed time 0 0 force time 0 0

9 ©EJC 2021 9749/01/J1H2Promo/2021 [Turn over 13 A man stands in a lift that is accelerating vertically downwards as shown. Which statement describes the force exerted by the man on the floor? A It is equal to the weight of the man. B It is greater than the force exerted by the floor on the man. C It is less than the force exerted by the floor on the man. D It is less than the weight of the man. 14 The first column in the table gives four examples of work being done. The second column gives more detail of the action. Which row is correct? example detail A a girl dives from a diving board i