2022 YIJC JC1 H2 Phy Promo Exam Paper 1 Question Paper

YISHUN INNOVA JUNIOR COLLEGE JC 1 PROMOTIONAL EXAM Higher 2 CANDIDATE NAME CG INDEX NO PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 29 September 2022 50 minutes READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Write your name and class on the Answer Sheet in the spaces provided unless this has been done for you. There are twenty five 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 11 printed pages and 1 blank page.

©YIJC 9749/01/YIJC/22 [Turn over 2 Data speed of light in free space, c = 3.00  108 m s–1 permeability of free space, o = 4  10–7 H m–1 permittivity of free space, o = 8.85  10–12 F m–1 (1/(36))  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 Formulae uniformly accelerated motion, s = ut + 2 1 at2 v2 = u2 + 2as work done on/by a gas, W = p  V hydrostatic pressure, p =  g h gravitational potential,  = r Gm− temperature, T/K = T/°C + 273.15 pressure of an ideal gas, p = 2CV Nm 3 1 mean translational kinetic energy of an ideal gas molecule, E = kT2 3 displacement of particle in s.h.m. x = xo sin  t velocity of particle in s.h.m., v = vo cos  t =   )( 22 xxo − electric current, I = A n v q resistors in series, R = R1 + R2+………. resistors in parallel, R 1 = ........11 21 ++ RR electric potential, V = r Q o4 alternating current/voltage, x = xo sin  t magnetic flux density due to a long straight wire, B = dπ2 o Iμ magnetic flux density due to a flat circular coil, B = r2 No Iμ magnetic flux density due to a long solenoid, B = Ion radioactive decay, x = xo exp(–t) decay constant,  = 2 1t 2 ln

©YIJC 9749/01/YIJC/22 [Turn over 3 Answer all questions. 1 What is equivalent to 2000 microseconds? A 2 s B 2 ms C 2 ps D 2000 ms 2 The Planck constant h has SI units J s. Which equation could be used to calculate the Planck constant? A DEh v= where D is distance, E is energy and v is velocity B vh D= where v is velocity and D is distance C 1 4h = where  is density D 2Frh m= where F is force, r is radius and m is mass 3 A car moves to the right with uniform acceleration along a straight road. Oil leaks from the car at the rate of one drop every three seconds. The diagram shows the distances between three successive oil drops on the road. What is the acceleration of the car? A 0.33 m s−2 B 0.66 m s−2 C 1.2 m s−2 D 2.0 m s−2 4 A ball is thrown vertically upwards from ground level and reaches a maximum height of 12.7 m before falling back to ground level. Assume air resistance is negligible. What is the total time for which the ball is in the air? A 1.61 s B 3.22 s C 3.88 s D 5.18 s

©YIJC 9749/01/YIJC/22 [Turn over 4 5 Which statement is an incorrect representation of Newton’s third law? A The reason a person is unable to move a heavy box when he pushes it is because the box pushes back on him with an equal and opposite force. B When the hammer hits a nail with a force of 100 N, the hammer will experience a force of 100 N due to the nail. C The weight of the book and the normal force which acts on the book when placed on a table is not an action-reaction pair. D The pull of the Earth on you and the pull you exert on the Earth is an action-reaction pair. 6 Water is pumped through a hose at a rate of 20 kg per minute. It emerges from the hose horizontally with a speed of 5.0 m s−1. What is the force that a person, who is holding the hose, require to prevent it from moving backwards? A 1.7 N B 4.0 N C 100 N D 6000 N 7 Two cables are attached to a bracket and exert forces as shown. What are the magnitudes of the horizontal and vertical components of the resultant of the two forces? horizontal component / N vertical component / N A 9.73 0.534 B 9.73 10.2 C 18.0 0.534 D 18.0 10.2

©YIJC 9749/01/YIJC/22 [Turn over 5 8 A submarine descends vertically at constant velocity. The three forces acting on the submarine are viscous drag, upthrust and weight. Which one of the following options is correct? A weight < drag B weight = drag C weight < upthrust D weight > upthrust 9 Four combinations of vectors are shown, each representing all the forces acting on an object. The forces all act in the same plane. The object is in equilibrium. Which combination of vectors could represent the forces acting on the object? A B C D 10 A car engine exerts an average force of 5000 N in moving the car 1.0 km up a slope inclined at an angle of 30 to the horizontal. The weight of the car is 12000 N. What is the work done by the weight of the car? A − 6.0 MJ B − 12 MJ C 6.0 MJ D 12 MJ 30 1.0 km

©YIJC 9749/01/YIJC/22 [Turn over 6 11 The force resisting the motion of a car is taken as being proportional to the square of the car’s speed. The magnitude of the force at a speed of 20 m s−1 is 800 N. What effective power is required from the car’s engine to maintain a steady speed of 40 m s−1? A 32 kW B 64 kW C 128 kW D 512 kW 12 A weight of 2.0 N is raised at a constant speed through a vertical height of 80 cm in 4.0 s using an electric motor. If the efficiency of the motor is 20%, what is the electrical power supplied to the motor? A 0.080 W B 0.50 W C 2.0 W D 78 W 13 The diagram shows an analogue watch. What is the average angular velocity of the hour hand? A 2.31  10−5 rad s−1 B 7.27  10−5 rad s−1 C 1.45  10−4 rad s−1 D 1.75  10−3 rad s−1

©YIJC 9749/01/YIJC/22 [Turn over 7 14 A mass m, attached to one end of an inextensible string of length 5.0 m, is made to move in a horizontal circle as the central axle is rotated. In a particular circular motion, the string makes an angle of 30 with the vertical as shown. What is the period of the mass’s motion about the central axle? A 1.0 s B 3.5 s C 4.8 s D 6.2 s 15 The acceleration of free fall at the surface of Neptune is approximately equal to the acceleration of free fall at the surface of the Earth. The mass of Neptune is 17 times the mass of the Earth. What is the value of the rati