SAJC Prelim H2 P1 2025 Qn and Ans

1 SAJC 2025 Preliminary Examination / 9749 [Turn Over Class Index Number Name 24S ST. ANDREW’S JUNIOR COLLEGE JC 2 2025 Preliminary Examination PHYSICS, Higher 2 9749/01 Paper 1 Multiple Choice 19th September 2025 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, index number and Civics Group the Answer Sheet in the spaces provided. There are thirty questions in 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. 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. For Examiner’s Use Total / 30 This document consists of 19 printed pages including this page.

2 SAJC 2025 Preliminary Examination / 9749 [Turn Over Data speed of light in free space c = 3.00 x 108 m s-1 permeability of free space o = 4  x 10-7 H m-1 permittivity of free space o = 8.85 x 10-12 F m-1 = (1/(36)) x 10-9 F m-1 elementary charge e = 1.60 x 10-19 C the Planck constant h = 6.63 x 10-34 J s unified atomic mass constant u = 1.66 x 10-27 kg rest mass of electron me = 9.11 x 10-31 kg rest mass of proton mp = 1.67 x 10-27 kg molar gas constant R = 8.31 J K-1 mol-1 the Avogadro constant NA = 6.02 x 1023 mol-1 the Boltzmann constant k = 1.38 x 10-23 J K-1 gravitational constant G = 6.67 x 10-11 N m2 kg-2 acceleration of free fall g = 9.81 m s-2 Formulae uniformly accelerated motion s = u t + ½ a t2 v2 = u2 + 2 a s work done on/by a gas W = p V hydrostatic pressure p =  g h gravitational potential  = r Gm− temperature T / K = T / oC + 273.15 pressure of an ideal gas p = 1 3 Nm V 〈c2〉 mean translational kinetic energy of an ideal gas molecule E = 2 3 kT displacement of particle in s.h.m. x = xo sin  t velocity of particle in s.h.m. v = v0 cos  t v =   22 0 xx − electric current I = Anvq resistors in series R = R1 + R2 + ... resistors in parallel 1 / R = 1 / R1 + 1 / R2 + ... electric potential V = r Q 04 alternating current/voltage x = xo sin  t magnetic flux density due to a long straight wire B = μ0I 2πd magnetic flux density due to a flat circular coil B = μ0NI 2r magnetic flux density due to a long solenoid B = μ0nI radioactive decay x = xo exp (- t) decay constant  = 2/1 2ln t

3 SAJC 2025 Preliminary Examination / 9749 [Turn Over Answer all questions. 1 The Clausius-Clapeyron equation for measuring relative vapour pressure of a gas oP P , at a temperature T is as follows:       −− = oT 1 T 1 R ΔH eP P o where H is the enthalpy of vaporization, R is the molar gas constant, P and Po are the final and initial pressures and To is the initial temperature of a gas. Which of the following has the same units as ΔH? A energy per mole B molar gas constant C temperature D no units 2 A student made a series of measurements of the diameter d of a wire using four micrometer screw gauges A, B, C and D. The table shows the measurements taken. If the actual diameter of the wire was 1.49 mm, which micrometer screw gauge produced a set of readings that could be described as accurate but not precise? micrometer screw gauge Readings d / mm A 1.49 1.46 1.52 1.50 B 1.48 1.58 1.51 1.40 C 1.35 1.37 1.42 1.42 D 1.32 1.37 1.41 1.50

4 SAJC 2025 Preliminary Examination / 9749 [Turn Over 3 Two cars, initially next to each other and at rest, accelerate in the same straight line at different uniform rates. After 3 s, they are 36 m apart. If they continue to accelerate at the same rate, how far apart will they be 5 s after they started? A 60 m B 96 m C 100 m D 256 m 4 A golf club hits a golf ball. The graph shows how the force F on the ball varies with time t. Which graph shows how the velocity v of the ball varies with time t?

5 SAJC 2025 Preliminary Examination / 9749 [Turn Over 5 A stream of water from a hose travels horizontally at speed v. The stream strikes a brick wall and falls vertically down it without splashing. The stream of water is a cylinder of cross-sectional area A. The water has density ρ. Which expression is the force exerted on the wall by the water? A 1 2Aρv2 B Aρv2 C 3 2Aρv2 D 2Aρv2 6 Two train carriages each of mass 5000 kg roll toward one another on a horizontal frictionless track. One is travelling at a velocity of u1 and the other at a velocity of u2, as shown. They collide and join together and have a final speed of 0.50 m s-1 towards the right after the collision. During the collision, 11 250 J of kinetic energy was lost. Taking rightward to be positive, what is u2? A − 2.0 m s-1 B − 1.0 m s-1 C 1.0 m s-1 D 2.0 m s-1 u1 u2

6 SAJC 2025 Preliminary Examination / 9749 [Turn Over 7 A block is moving along a horizontal frictionless surface. A constant force F and a constant resistive force of 5.0 N act on the block as it is moving in the direction of the force F, as shown. The graph shows the variation with time of the momentum of the block. What is the magnitude of force F? A 2.0 N B 4.2 N C 5.8 N D 8.0 N 8 A climber is supported by a light rope on a vertical wall as shown. The weight W of the climber is 520 N and the reaction force R acts at right angles to the wall. The climber is in equilibrium. Which row shows the value of the tension T in the rope and R? T / N R / N A 500 150 B 500 480 C 550 170 D 550 520

7 SAJC 2025 Preliminary Examination / 9749 [Turn Over 9 On a fairground ride, passengers are rotated in a vertical circle at a constant angular speed. A passenger is shown in the diagram when he is at the side of the circle. Which of the following diagrams best illustrates the forces acting on the passenger in this position? A B C D

8 SAJC 2025 Preliminary Examination / 9749 [Turn Over 10 A small glass marble is moving in a horizontal circle round the inside surface of a smooth bowl. Its angular velocity is 8.0 rad s-1 and the normal reaction N acting on the marble is inclined at 35° to the vertical as shown. What is the radius r of the horizontal circle? A 0.050 m B 0.070 m C 0.090 m D 0.11 m 11 Many highway entrance and exit roads are circular and designed for cars moving at 50 km h-1. To design a similar road for a speed of 100 km h-1 the engineers should increase the radius of the circular section by a factor of A 2 B 2 C 3 D 4

9 SAJC 2025 Preliminary Examination / 9749 [Turn Over 12 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 potential energy E. Which row correctly specifies the magnitude and the direction of the acceleration due to gravity in this field? magnitude direction A E mx → B E mx  C E x → D E x  13 A fixed amount of an ideal gas has pressure p and volume V. The graph shows the variation of 1/p with V at a constant temperature. The amount of gas and the thermodynamic temperature are both halved. Which line will be produced?

10 SAJC 2025 Preliminary Examination / 9749 [Turn Over 14 The graphs below show how pV varies with p, for a sample of nitrogen gas and oxygen gas at the temperature of a boiling liquid and at the temperature of the triple point of water in a constant volume gas thermometer. 40 20 p / Pa 5.8 5.9 6.0 temperature of triple-point of water temperature