2023 ASRJC H2 physics Promo P1

1 9749/01/ASRJC/2023PROMO [Turn over Name: _____________________________ ( ) Class: 24 / ______ 2023 JC1 Promotional Exam PHYSICS Higher 2 9749/01 Paper 1 Multiple Choice Tuesday 26 September 2023 40 minutes 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 twenty 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. This document consists of 15 printed pages and 1 blank page. ANDERSON SERANGOON JUNIOR COLLEGE

9749/01/ASRJC/2023PROMO 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 2

3 9749/01/ASRJC/2023PROMO [Turn over Formulae uniformly accelerated motion =s 2 2 1 atut + =2v asu 22 + work done on/by a gas =W Vp hydrostatic pressure =p gh gravitational potential = r Gm− temperature T/K = T/C + 273.15 pressure of an ideal gas p =  2 3 1 cV Nm mean translational kinetic energy of an ideal gas molecule =E kT2 3 displacement of particle in s.h.m. x = x0 sin  t velocity of particle in s.h.m. v = v0 cos  t = 22 xxo − electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2 + … electric potential V = r Q o4 alternating current/voltage x = x0 sin  t magnetic flux density due to a long straight wire B = d o   2 I magnetic flux density due to a flat circular coil B = r No 2 I magnetic flux density due to a long solenoid B = Ino radioactive decay x = x0 exp(–t) decay constant  = 2 1 2ln t

4 9749/01/ASRJC/2023PROMO 1 What is a reasonable estimate of the a cceleration of an MRT train leaving a station in Singapore? A 0.1 m s−2 B 1 m s−2 C 10 m s−2 D 100 m s−2 2 The diagram shows an experiment to measure the speed of a small ball falling at constant speed through a clear liquid in a glass tube. There are two marks on the tube. The top mark is positioned at 115 ± 1 mm on the adjacent rule and the lower mark at 385 ± 1 mm. The ball passes the top mark at 1.50 ± 0.02 s and passes the lower mark at 3.50 ± 0.02 s. The constant speed of the ball is calculated by 1385 115 270 135 mm s3.50 1.50 2.00 −− ==− Which expression calculates the fractional uncertainty in the value of this speed? A 2 0.04 270 2.00+ B 2 0.04 270 2.00− C 1 0.02 270 2.00 D 1 0.02 270 2.00 3 A sprinter takes a time of 11.0 s to run a 100 m race. She first accelerates uniformly from rest, reaching a speed of 10 m s -1. She then runs at a constant speed of 10 m s -1 until the finish line. What is the uniform acceleration of the sprinter for the first part of the race? A 0.5 m s-2 B 0.91 m s-2 C 1.7 m s-2 D 5.0 m s-2

5 9749/01/ASRJC/2023PROMO [Turn Over 4 Which displacement-time graph best represents the motion of a falling sphere, the initial acceleration of which eventually reduces until it begins to travel at constant terminal velocity? A B C D

6 9749/01/ASRJC/2023PROMO 5 A single horizontal force F is applied to a block X which is in contact with a separate block Y, as shown. The blocks remain in contact as they accelerate along a horizontal frictionless surface. Air resistance is negligible. X has a greater mass than Y. Which statement is correct? A The acceleration of X is equal to force F divided by the mass of X. B The force that X exerts on Y is equal to F. C The force that X exerts on Y is less than F. D The force that X exerts on Y is less than the force that Y exerts on X. 6 The resultant force acting on an object is slowly increased. Which graph shows the variation with time t of the momentum p of the object? A B C D

7 9749/01/ASRJC/2023PROMO [Turn Over 7 An air bubble in a tank of water is rising with constant velocity. The forces acting on the bubble are X, Y, and Z as shown. Which of the following describes the three forces? A Z is the viscous drag on the bubble, Y is the weight of the bubble, X is the upthrust on the bubble and X = Y + Z. B Z is the viscous drag on the bubble, Y is the weight of the bubble, X is the upthrust on the bubble and X > Y + Z. C Z is the weight of the bubble, Y is viscous drag on the bubble, X is the upthrust on the bubble and X = Y + Z. D Z is the weight of the bubble, Y is viscous drag on the bubble, X is the upthrust on the bubble and X > Y + Z.

8 9749/01/ASRJC/2023PROMO 8 A ladder is positioned on icy (frictionless) ground and is leant against a rough wall. At the instant of release it begins to slide. Which diagram correctly shows the directions of the forces P, W and R acting on the ladder as it begins to slide? A B C D 9 The total energy input Ein in a process is partly transferred to useful energy output U and partly transferred to energy that is wasted W. What is the efficiency of the process? A 100% in U E  B 100% in W E  C 100%U W  D 100% in UW E +  W P

9 9749/01/ASRJC/2023PROMO [Turn Over 10 A bungee jumper jumps from a platform and is decelerated by an elastic bungee cord, as shown. When the jumper makes the jump, his initial gravitational potential energy is converted into his kinetic energy and into elastic potential energy in the cord. At which part of the jump are all three types of energy non-zero? A On the platform before the jump. B On the way down before the cord has started to extend. C On the way down when the net force acting on the jumper is zero. D At the point when the cord is stretched to a maximum. 11 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 NOT TO SCALE

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