EJC Physics 2021 J2 H1 MYE P1 (Printed)

©EJC 2021 8867/01/J2H1MYE/2021 [Turn over EUNOIA JUNIOR COLLEGE JC2 Mid Year Examination 2021 General Certificate of Education Advanced Level Higher 1 PHYSICS Paper 1 Multiple Choice 8867/01 09 Jul 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 8867/01/J2H1MYE/2021 Data Formulae uniformly accelerated motion, s = ut + ½at2 v2 = u2 + 2as resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + … speed of light in free space, c = 3.00 × 108 m s–1 elementary charge, e = 1.60 × 10–19 C 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 the Avogadro constant, NA = 6.02 × 1023 mol–1 gravitational constant, G = 6.67 × 10–11 N m2 kg–2 acceleration of free fall, g = 9.81 m s–2

3 ©EJC 2021 8867/01/J2H1MYE/2021 [Turn over 1 Which formula could be correct for the speed v of ocean waves in terms of the density ρ of sea-water, the acceleration of free fall g, the depth h of the ocean and the wavelength λ? A vg λ= B gv h= C v gh ρ= D gv ρ= 2 A specimen of volume V is cut from a length of circular -section metal rod. The length of the specimen is known with an uncertainty of ± 1% and the diameter with an uncertainty of ± 2%. What will be the uncertainty of V? A 2% B 3% C 4% D 5% 3 The speed of an aeroplane in still air is 200 km h-1. The wind blows from the west at a speed of 85.0 km h-1. In which direction must the pilot steer in order to fly due north? A 23.0o east of north B 23.0o west of north C 25.2o east of north D 25.2o west of north 4 A toy airplane is flying above the ground at a constant horizontal velocity of 5.0 m s -1 when the toy pilot is ejected. The airplane propels the toy pilot upward at a height of 2.4 m above the ground and the vertical component of his speed is initially 3.0 m s -1. Ignore the effects of air resistance. What is the speed of the toy pilot when it hits the ground? A 3.7 m s-1 B 5.8 m s-1 C 7.5 m s-1 D 9.0 m s-1

4 ©EJC 2021 8867/01/J2H1MYE/2021 5 The minimum time T required for a car to safely overtake a lorry is illustrated in the given figure. It is measured from the time the front of the car is level with the rear of the lorry, until the rear of the passing car is one full car-length ahead of the front of the lorry. The lorry may be taken to be 17.0 m long and the car 3.5 m long. The given graph shows how the speed v of the car and the lorry vary with time t. What is the value of T? A 0.86 s B 1.2 s C 2.6 s D 3.0 s 6 Which equation can be rearranged to give the definition of acceleration? A F = ma B s = ut + ½ at2 C v = u + at D v2 = u2 + 2as T Car begins to overtake: time t = 0 t 0 lorry car lorry Car safely overtakes: time t = T car v/ m s-1 26 10 car lorry

5 ©EJC 2021 8867/01/J2H1MYE/2021 [Turn over 7 A projectile of mass 3.2 × 10 -2 kg is fired from a cylindrical barrel of cross -sectional area 2.8 × 10-4 m2 by means of compressed gas. The variation with time t of the excess pressure P of the gas in the barrel above atmospheric pressure is shown in the figure. What is the speed of the projectile as it leaves the barrel? A 42 m s-1 B 1300 m s-1 C 1.5 × 105 m s-1 D 4.7 × 106 m s-1 8 The variation with time of the upward thrust T on the rocket and the total weight W of the rocket are shown in the figure below. Given that m the mass of rocket at time t 1, which expression gives the speed v of the rocket at time t1? A v m = area P + area Q + area R + area S B v m = area Q + area R + area S C v m = area R + area S D v m = area S P / MPa t / ms 0 100 70 3.0 force time T W P Q S R t1

6 ©EJC 2021 8867/01/J2H1MYE/2021 9 A train consisting of six wagons each of mass 6.0 × 104 kg is pulled at a constant speed by a locomotive along a straight horizontal track. The horizontal force resisting the motion of each wagon is 4000 N. The train now accelerates at 0.15 m s─2. What is the tension in the coupling between wagons 1 and 2? A 26 kN B 40 kN C 52 kN D 65 kN 10 A body, initially at rest, explodes into two fragments, one having three times the mass of the other. What is the value of the ratio speed of the more massive fragment speed of the less massive fragment ? A 0.33 B 0.58 C 1.73 D 3.00 11 The given diagram shows a load W supported by four hinged rods P, Q, R and S, connected and mounted in a vertical plane. Which row correctly shows the rods in compression and the rods in tension? In compression In tension A P Q, R, S B P, Q R, S C Q, R P, S D R, S P, Q P Q R S W

7 ©EJC 2021 8867/01/J2H1MYE/2021 [Turn over 12 A beam, the weight of which may be neglected, is supported by three identical springs. When a weight W is hung from the middle of the beam, the extension of each spring is x. The middle spring and the weight are removed. What is the extension when a weight of 3W is hung from the middle of the beam? A x2 9 B x9 2 C x D x3 13 A car of mass 1000 kg travels up a hill at a constant speed. It gains 87 m in height travelling a distance of 500 m. The total frictional force is 580 N. What is the work done by the driving force? A 0.85 × 106 J B 1.14 × 106 J C 4.90 × 106 J D 5.19 × 106 J 14 Which does not involve work being done by a force? A a bicycle free-wheeling downhill at a constant speed B the charging of a car battery C the motion of a spacecraft in deep space at a constant speed D the release of compressed air from a cylinder into the atmosphere

8 ©EJC 2021 8867/01/J2H1MYE/2021 15 A massless spring is attached to a mass. The system is lying horizontally on a smooth table. The tension F in the spring is as shown in the figure below. A force that matches F is applied, causing the spring to extend. This is shown on the graph by the line OSP. The applied force on the mass-spring system is then released and the spring contracts. This is shown on the graph by the line PQ. Which of the following correctly represents the energies involved in the process? work done to extend the spring heat loss kinetic energy of mass just before spring returns to Q A Y + Z Y Z B Y + Z Y Z - Y C Z Y Y + Z D X Z - Y Z 16 Four bodies of equal mass M are equally spaced in a circle of radius R. What is the net gravitational force on each body? A GM R 2 2 0.25 B GM R 2 2 0.96 C GM R 2 2 1.3 D GM R 2 2 1.7 R

9 ©EJC 2021 8867/01/J2H1MYE/2021 [Turn over 17 A mass m of 5.0 kg is undergoing uniform circular motion around a pole as shown in the figure below at an angular speed of 2.0 rad s -1. Strings A and B that support the mass make angles of 30° and 6