2021 J2 H2 Physics Prelim P1

This paper consists of 15 printed pages Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 15 September 2021 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and index number on the Answer Sheet provided. There are thirty questions in this section. 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 Question Paper. The use of an approved scientific calculator is expected, where appropriate.

2 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination DATA AND FORMULAE 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

3 [Turn over Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination Formulae uniformly accelerated motion, s = ut + at 2 v 2 = u 2 + 2as work done on/by a gas, W = p V hydrostatic pressure, p =  g h gravitational potential,  =  temperature T / K = T / oC + 273.15 pressure of an ideal gas p = mean translational kinetic energy of of an ideal gas molecule, E =  displacement of particle in s.h.m., x = xo sin t velocity of particle in s.h.m., v = vo cos t =  electric current I = A n v q resistors in series, R = R1 + R2 +  resistors in parallel, 1/R = 1/R1 + 1/R2 +  electric potential, V = alternating current/voltage, x = xo sin t magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay, x = xo exp(t) decay constant,  = 12 t ln2 2 1 r Gm 21 3 Nm cV  3 2 kT  22 xxo  r Q o4 2 o d   I 2 oN r  I on I

4 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 1 The table below shows some estimates of some physical quantities. Which quantity is not a reasonable estimate? quantity value A electric current in a heater 12 A B mass of an adult person 70 kg C maximum speed of an Olympic sprinter 10 m s–1 D water pressure at the bottom of a swimming pool 106 Pa 2 An object is dropped at time t = 0 s from a tall building. Air resistance is significant. Three graphs are plotted against time:  the height of the object above the ground  the speed of the object  the magnitude of the resultant force on the object. What are the quantities X, Y and Z? height of the object above the ground speed of the object magnitude of the resultant force on the object A X Y Z B X Z Y C Y Z X D Z Y X

5 [Turn over Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 3 On a stationary ship, a golf ball is struck so that it flies off horizontally from the edge of the deck of the ship at a speed of 72 m s –1 and lands in the sea a t a horizontal distance of 220 m. Assuming air resistance to be negligible, what is the vertical height of the deck above the sea? A 15 m B 30 m C 46 m D 92 m 4 Which of the following diagrams shows a body in equilibrium? A B C D 2 N 2 N 2 N 2 N 2 N 2 N 2 N 2 N 2 N 2 N 2 N 1 N 2 N 1 N 2 N

6 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 5 A cup contains 100 g of water. The pressure at the bottom of the cup is P. before after 50 g of water is removed from the cup, frozen into ice, and added back to the cup, as shown above. 10% of the volume of the ice is above the surface of the water. What is the new pressure at the bottom of the cup? A 0.95P B P C 1.05P D 1.10P 6 An aircraft, powered by a jet engine, is flying at a constant speed of 800 m s–1. 20 kg of exhaust gas is ejected from the engine every second, with a velocity of 100 m s-1 in the opposite direction relative to the aircraft. What is the magnitude of the resistive force experienced by the aircraft? A 2 000 N B 14 000 N C 16 000 N D 18 000 N 7 A man of 70 kg stands on a weighing scale in a lift. The lift begins to ascend with an acceleration of 0.80 m s–2, before slowing to a stop with a maximum deceleration of 0.30 m s–2. What is the difference between the maximum and minimum reading of his mass observed on the weighing scale? A 2.1 kg B 3.6 kg C 5.7 kg D 7.8 kg

7 [Turn over Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 8 A train on a straight horizontal track moves from rest at constant acceleration. The horizontal forces on the train are the driving force exerted by the engine and a resistive force which increases with speed. Which graph represents the variation with time t of the power P developed by the engine? A B C D

8 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 9 A stone attached to a light inextensible string at position A is given an initial push to the right. It subsequently moves in a vertical circle of radius 1.5 m and the string just slackens at position B when it makes an angle of  to the vertical. Given that the velocity of the stone at position B is 2.2 m s-1, what is  ? A 9 B 19 C 71 D 81 10 A small mass m is placed in the gravitational field of a large mass M. Both masses experience a force F. What is the gravitational field strength due to M at the position of m? A F Mm B F M C FMm D F m 11 Which of the following satellites must be a geostationary satellite orbiting about Earth? A Satellite A has a period of 12 hours. B Satellite B orbits directly above the equator. C Satellite C orbits from east to west. D Satellite D always remains above the same point on the Earth.

9 [Turn over Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 1 Preliminary Examination 12 Two flasks P and Q contain an ideal gas and are connected with a tube of negligible volume compared to that of the flasks. The volume of P is triple the volume of Q. P is held at a temperature of 200 K and Q is held at a temperature of 600 K. What is the mass of gas in P mass of gas in Q ? A 1 9 B 1 3 C 3 D 9 13 A fixed mass of an ideal gas is trapped in a cylinder of constant volume and its temperature is varied. Which graph shows the variation of the pressure of the gas with temperature in degrees Celsius? A B C D 14 A block of iron of mass