Prelim H2P1

1 Name: _____________________________ ( ) Class: 21 / ______ 2021 JC2 Preliminary Examination PHYSICS Higher 2 9749/01 Paper 1 Multiple Choice Tuesday 21 September 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Multiple Choice Answer Sheet. Shade and write your NRIC/FIN. 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 Multiple Choice Answer Sheet. Read the instructions on the Multiple Choice 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. 9749/01/ASRJC/2021PRELIM [Turn over ANDERSON SERANGOON JUNIOR COLLEGE CLT Notice Questions set on the Common Last Topic of the syllabus do not form part of the assessment. They will not be marked by the Examiners. Do not answer the following questions: Question 30 on page 16 Turn to these questions and cross them out by drawing a line through these questions. The total time allowed for this Question Paper has not been changed. The total mark allowed for this Question Paper is now 29. This document consists of 16 printed pages and 0 blank page.

Data speed of light in free space c = 3.00  108 m s−1 permeability of free space 0 = 4  10−7 H m−1 permittivity of free space 0 = 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 9749/01/ASRJC/2021PRELIM 2

3 Formulae uniformly accelerated motion s = ut + 1 2 at2 v2 = u2 + 2 as work done on/by a gas W= pΔV hydrostatic pressure p= ρ gh gravitational potential φ= −Gm r temperature T/K  T/C + 273.15 pressure of an ideal gas p  1 3 Nm V ⟨ c2⟩ mean translational kinetic energy of an ideal gas molecule E= 3 2 kT displacement of particle in s.h.m. x  x0 sin  t velocity of particle in s.h.m. v  v0 cos  t = ±ω √ xo2−x2 electric current I  Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2 + … electric potential V = Q 4 πεo r alternating current/voltage x = x0 sin  t magnetic flux density due to a long straight wire B  μo I 2 πd magnetic flux density due to a flat circular coil B  μo∋ ¿ 2 r ¿ magnetic flux density due to a long solenoid B  μo∋¿ ¿ radioactive decay x = x0 exp(–t) decay constant   ln 2 t 1 2 9749/01/ASRJC/2021PRELIM [Turn over

9749/01/ASRJC/2021PRELIM

5 1 The table shows some measurable quantities. Which row gives the correct order of magnitude of the measurable quantity in the stated unit? measurable quantity order of magnitude unit A mass of a coin 10–4 kg B thickness of a sheet of paper 10–2 m C weight of an apple 100 N D temperature of a person’s body 101 K 2 A micrometer is used to measure the diameters of two cylinders. diameter of first cylinder = (12.78 0.02) mm diameter of second cylinder = (16.24 0.03) mm The difference in the diameters is calculated. What is the percentage uncertainty in this difference? A 0.29 B 0.58 C 0.87 D 1.4 3 Two identical stones are simultaneously released from rest from different heights as shown. Air resistance is negligible. As the stones fall, which of the following is true about the distance between them? A The distance will increase continuously. B The distance will decrease until they touch. C The distance will remain the same. D The distance will increase initially then remain the same. 4 A person of mass 60 kg stands on an accurate bathroom scale, placed on the floor of a lift which operates in a tall building. At a certain instant the bathroom scale reads 58 kg. Which row could give the person’s direction of movement and type of motion? direction motion 9749/01/ASRJC/2021PRELIM [Turn Over

6 A downwards constant speed B downwards slowing down C upwards constant speed D upwards slowing down 5 The frictionless system shown is accelerated by an applied force of magnitude F. What is the tension in the string between the blocks? A F B F C F D 2 F 6 A molecule of mass m travels with velocity + u directly towards a stationary molecule of mass 4m and collides elastically with it. What is the velocity of the molecule of mass m after the collision? A B C D ‒u 7 The force diagrams show all the forces acting on a beam of length 3x. Which force system causes only rotational motion of the beam without any linear movement? A B 9749/01/ASRJC/2021PRELIM F1 kg 2 kg

7 C D 8 An object resting on a horizontal frictionless surface is accelerated from rest by a constant force from a motor. Which of the following graphs shows the variation of the motor power P with time t ? 9 Two ice boats, of masses m and 2m, are made to compete in a race on a frictionless frozen lake. The boats have identical sails so that the wind pushes them forward with the same force. The two boats start from rest and travel the same distance. Which of the following statements is correct? A The boat of mass m will win the race but the two boats will have the same final speed. 9749/01/ASRJC/2021PRELIM [Turn Over t P t P t P t P 0 0 0 0 A B C D

8 B The boat of mass m will win the race but it will have a lower final kinetic energy. C The boat of mass m will win the race and it will have a higher final kinetic energy. D The boat of mass m will win the race but the two boats will have the same final kinetic energy. 10 A roller coaster starts from rest on a hill-top. It accelerates along a frictionless track before entering a loop-the-loop of radius 20 m as shown below. What is the minimum normal contact force that the roller coaster seat exerts on a passenger with weight W, as it passes through the ‘loop the loop’? A 0 B 3.5 W C 4.5 W D 5.5 W 11 A mass m is situated in a uniform gravitational field. When the mass moves through a displacement x, from P to Q, it loses an amount of 9749/01/ASRJC/2021PRELIM 85 m 20 m ‘loop the loop’ roller coaster H

9 potential energy E. Which row correctly specifies the magnitude and the direction of the acceleration due to gravity in this field? magnitude direction A  B  C  D  12 Cooling water enters the heat exchanger in the turbine hall of a nuclear power station at 6.0 C and leaves at 14.0 C. The rate of heat removal by the water is 6.7  10 9 J per minute. The specific heat capacity of water is 4200 J kg1K1. What is the rate of water flow? A B C D 13 Air is enclosed in a cylinder by a gas-tight, frictionless piston of cross-sectional area 3.0  10–3 m2. When atmospheric pressure is 100k Pa, the piston settles 80 mm from the end of the cylinder (see diagram 1). The piston is then pulled out until it is 160 mm from the end of the cylinder (see diagram 2) and is held there. The temperature of the air in the cylinder returns to its