EJC 2020 J1H2 Promo P1

©EJC 2020 9749/01/J1H2PROMO/2020 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examination 2020 General Certificate of Education Advanced Level Higher 2 PHYSICS Paper 1 Multiple Choice 9749/01 02 October 2020 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 19 printed pages and 1 blank page.

2 ©EJC 2020 9749/01/J1H2PROMO/2020 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 2020 9749/01/J1H2PROMO/2020 [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 2020 9749/01/J1H2PROMO/2020 1 Using the concept of relativity, the total energy E of a particle can be expressed using the following equation    E c c  2 222 where c is the speed of light. What physical quantities do 𝛼 and 𝛽 represents respectively? 𝛼 𝛽 A B C D mass force mass momentum momentum momentum force mass 2 The mass, length and breadth of a sheet of aluminium foil when measured is subjected to a percentage uncertainty of 1%, 1% and 2% respectively. The mean thickness of the foil is determined by folding the foil twice to give a stack of 4 sheets which thickne ss when measured gives a value of (11.2 ± 0.4) mm. What is the percentage uncertainty of the calculated density? A 4.9% B 7.6% C 11.1% D 18.3%

5 ©EJC 2020 9749/01/J1H2PROMO/2020 [Turn over 3 A voltmeter gives readings that are larger than the true values and has a systematic error. Which graph represents the calibration curve for the voltmeter most accurately?

6 ©EJC 2020 9749/01/J1H2PROMO/2020 4 A car starts from rest and accelerate s along a straight line. The acceleration -time graph of the car is given below. Which of the following options gives the correct displacement-time graph of the car? A B C D

7 ©EJC 2020 9749/01/J1H2PROMO/2020 [Turn over 5 At a construction site, a workman is in an elevator moving upwards at a constant speed u. When the elevator is level with the first floor, he lets go of a spanner. At the same instant, a second workman standing on the first floor throws a hammer upwards with initial speed u. Which of the following statement correctly describ es the motion of the hammer and the spanner as seen by the workman on the first floor assuming that both the spanner and hammer will hit the first floor? A The spanner lands on the first floor before the hammer does. B Both the spanner and hammer lands on the first floor at the same time. C The spanner travels a longer distance than the hammer before landing on the first floor. D The spanner and the hammer both move upwards, but the spanner rises more slowly than the hammer. 6 3 springs A, B and C with spring constants kA = 2 N m-1, kB = 3 N m-1and kC = 6 N m-1 are connected in series as shown below. What is the ratio of the extensions xA : xB : xC when the spring is being subjected to a force of 12 N? A 1 : 2 : 3 B 2 : 3 : 6 C 3 : 2 : 1 D 6 : 3 : 2 spanner

8 ©EJC 2020 9749/01/J1H2PROMO/2020 7 A manometer is filled with mercury, water and oil as shown below. Given that the density of mercury, water and oil is 13600 kg m -3, 1000 kg m -3 and 800 kg m -3 respectively, what is the value of height h? A 8.0 cm B 18.0 cm C 68.0 cm D 320.0 cm 8 6 teams A, B, C, D, E and F are playing a game of tug of war concurrently by pulling at the ropes connected to a regular hexagon with centre O as shown below. The magnitude of the forces exerted by the teams are shown in the diagram. What is the magnitude and direction of the resultant force acting on the hexagon ring? A 600 N along OE B 600 N along OB C 900 N along OE D 900 N along OB

9 ©EJC 2020 9749/01/J1H2PROMO/2020 [Turn over Block B Block A F 3M 2M 300 9 Two blocks A and B with masses 3 M and 2M respectively are pushed up a smooth slope by a force F applied along the slope as shown. What is the magnitude of the force that B exerts on A? A 1 2F B 2 5 F C 2 3 F D F 10 A helicopter with blades of diameter 5.0 m is hovering above the ground at a particular instant in time. Its blades are rotating in such a way that they are pushing air downwards at a speed of 18 m s-1. The density of the surrounding air can be taken as 1.02 kg m-3. What is the upward force acting on the blades? A 360 N B 1400 N C 6500 N D 26000 N

10 ©EJC 2020 9749/01/J1H2PROMO/2020 force v 2v 2M M 11 A body of mass 3 .0 kg is acted on by a force F which varies with time t as shown in the diagram below. Given that the velocity of the body at t = 4 s is 12 m s -1, what is the velocity of the body at t = 8 s? A 0 m s-1 B 20 m s-1 C 24 m s-1 D 36 m s-1 12 An object of mass 2 M travelling to the right with speed v collides elastically with another object of mass M travelling to the left with speed 2v. What is the total momentum and total kinetic energy of the two objects after collision? Total momentum Total kinetic energy A B C D 0 4Mv 0 4Mv 0 0 3Mv2 3Mv2 t/ s force F/ N