EJC 2018 J1H2 Promo P1

©EJC 2018 9749/01/J1H2PROMO/2018 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examination 2018 General Certificate of Education Advanced Level Higher 2 PHYSICS Paper 1 Multiple Choice 9749/01 02 October 2018 40 minutes 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 twenty 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 12 printed pages and 0 blank page.

2 ©EJC 2018 9749/01/J1H2PROMO/2018 Data 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/(36 π))  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

3 ©EJC 2018 9749/01/J1H2PROMO/2018 [Turn over Formulae uniformly accelerated motion, s = ut + ½at2 v2 = u2 + 2as work done on/by a gas, W = pΔV 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 gas 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 = 4 o Q r alternating current/voltage, x = xo sin ωt magnetic flux density due to a long straight wire B = 2 o d   I magnetic flux density due to a flat circular coil B = 2 oN r  I magnetic flux density due to a long solenoid B = on I radioactive decay, x = xo exp (–λt) decay constant λ = 1 2 ln2 t

4 ©EJC 2018 9749/01/J1H2PROMO/2018 1 Which of the following could be the correct expression for the speed 𝑣 of sound in a gas of density 𝜌 and at a pressure 𝑃? (𝛾 is a dimensionless constant.) A 𝑣 = √ 𝛾 𝜌𝑃 B 𝑣 = √𝛾𝑃 𝜌 C 𝑣 = √𝛾𝜌 𝑃 D 𝑣 = √𝛾𝜌𝑃 2 The viscosity of a fluid, 𝜇, can be determined by measuring the terminal velocity, 𝑣𝑇, of a sphere when it descends in the fluid. The fluid has a density, 𝜌𝑓, while the sphere has a density, 𝜌𝑠, and a diameter of 𝑑. The viscosity can then be calculated by the formula 𝜇 = 5(𝜌𝑠 − 𝜌𝑓) 9𝑣𝑇 𝑑2 The values measured are 𝑣𝑇 = (1.60 ± 0.04) m s -1 𝜌𝑠 = (2700 ± 20) kg m-3 𝜌𝑓 = (900 ± 10) kg m-3 𝑑 = (20.0 ± 0.4) mm What is the percentage uncertainty in the value of 𝜇? A 6.2 % B 7.1 % C 8.2 % D 8.4 % 3 A car starts from rest and travels along a straight road. The graph below shows the variation with time of its acceleration during part of the journey. At which point on the graph does the car have its greatest velocity? time acceleration A 0 B C D

5 ©EJC 2018 9749/01/J1H2PROMO/2018 [Turn over 4 The figure below shows two paths of two similar balls kicked at the ground level from A to B. Ignoring the effects of air, which of the following statements is true? A The initial speed of Ball 1 is greater than the final speed of Ball 1. B The final horizontal speed of Ball 1 is greater than the final horizontal speed of Ball 2. C The time of flight of Ball 1 is four times the time of flight of Ball 2. D The final vertical speed of Ball 1 is two times the final vertical speed of Ball 2. 5 A trailer of mass 400 kg is pulled by a car of mass 1200 kg. The diagram shows the horizontal forces acting on the trailer. What is the net force acting on the car alone? A 400 N B 600 N C 1200 N D 1800 N Ball 1 Ball 2 y 4y Pulling force on trailer A B

6 ©EJC 2018 9749/01/J1H2PROMO/2018 6 The diagram shows a trolley moving on a smooth horizontal table at a speed of 1.25 m s─1. A block with mass 350 g is then dropped vertically onto the trolley from a height of 0.200 m above it and then remains on it. After the block is dropped onto the trolley, what is the speed of the trolley? A 0.0875 m s-1 B 0.856 m s-1 C 1.17 m s-1 D 1.25 m s-1 7 The spring system shown is composed of two springs, P and Q, of negligible mass connected in series. P has a spring constant of 30 N m1 and Q has a spring constant of 10 N m1. When a 3.0 N load is supported by the system, which of the fol lowing is the overall extension produced? A 40 mm B 150 mm C 400 mm D 433 mm 350 g block 1.25 m s-1 5.00 kg P 3.0 N load Q

7 ©EJC 2018 9749/01/J1H2PROMO/2018 [Turn over 8 A uniform beam of weight W is hinged on one end at A and held by a wire on the other end at B. It carries a load, also of weight W, as shown. The tension in the wire is T. Which of the following is the most likely direction of the force exerted by the hinge on the beam at A? A AB B AC C AD D AE 9 An object of mass m passes a point X on the ground with a velocity v and slides up a frictionless incline. It stops at a point Y which is at a height h above the ground. A second object of mass 0.50m passes the point X with a velocity of 0.50 v. To what height will it rise? A 0.25h B 0.50h C 0.71h D h 10 A block of mass 5.0 kg is released from a height of 1.0 m. What is the average power, in W, delivered to the block throughout its motion before it hits the ground? Take the acceleration of free fall to be g. A 5 2 𝑔 3 2 B 5√2 2 𝑔 5 2 C 5√2 2 𝑔 3 2 D 5√2 2 𝑔2 h Y X v T A B C D W W E

8 ©EJC 2018 9749/01/J1H2PROMO/2018 f/ Hz amplitude 5 a 11 A pendulum is constructed from a fixed length of light thread and a spherical pendulum bob. It is forced to oscillate in air at different frequencies f. The following diagram shows how the amplitude of its oscillation varies with f. If the experiment is repeated in a partial vacuum, which graph best represents the variation with f of the amplitude? A B C D f/Hz amplitude 5 ao f/Hz amplitude 5 ao f/Hz amplitude 5 ao f/Hz amplitude 5 ao

9 ©EJC 2018 9749/01/J1H2PROMO/2018 [Turn over 12 The diagram shows a child sitting on a playground turntable, which is turning with constant angular velocity. Which diagram shows the forces acting on the child when in the position shown? A B C D support force from platform weight friction support force from platform centripetal force friction weight friction support force from platform friction centripetal force weight support force from platform centrifugal force weight

10 ©EJC 2018 9749/01/J1H2PROMO/2018 13 An aircraft is moving in a horizontal plane at a constant speed. It banks at angle of 30 0 to the vertical in order to make a turn as shown in the diagram below. The radius of the turn is 5000 m. What is the speed of the aircraft? A 40 m s-1 B 54 m s-1 C 168 m s-1 D 2