TJC 2025 H2 Prelim Paper 1

TEMASEK JUNIOR COLLEGE 2025 JC2 PRELIMINARY EXAMINATION Higher 2 PHYSICS 9749/01 Paper 1 Multiple Choice 18 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 and Civics group on 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. Do NOT open the booklets until you are told to do so. This booklet consists of 16 printed pages and one blank page

2 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 or (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 Js 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 = ut + ½ at2 v2 = u2 + 2as work done on/by a gas W = p ΔV hydrostatic pressure p = gh gravitational potential  = –Gm/r temperature T/K = T/oC + 273.15 pressure of an ideal gas p = 3 1 V Nm < c2 > mean translational kinetic energy of an ideal gas molecule E = 2 3 kT displacement of particle in s.h.m. x = xosint velocity of particle in s.h.m. v = vocos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 = rε4π Q o alternating current/voltage x = xo sint magnetic flux density due to a long straight wire B = 𝜇𝑜𝐼 2𝜋𝑑 magnetic flux density due to a flat circular coil B = 𝜇𝑜𝑁𝐼 2𝑟 magnetic flux density due to a long solenoid B = onI radioactive decay x = x0 exp(−t) decay constant λ = 𝑙𝑛2 𝑡1/2

3 [Turn over 1 A capacitor is a device used to store electric charges. It consists of a pair of conducting plates. The capacitance C of a capacitor is defined as the ratio of the charge Q on either plate to the magnitude of the potential difference V between the plates, as depicted in the formula: = QC V Which of the following shows the SI base units for capacitance C? A A2 s4 m-2 kg-1 B s2 m-2 kg-1 C A2 m-2 kg-1 D C2 kg-1 m-2 s2 2 Four students conduct their own experiment s to determine the value of Planck’s constant. The following table contains their experimental data. Which student’s measurement is accurate but imprecise, compared to the others? student Planck’s constant, h / 10–34 J s A 6.64 6.61 6.61 6.64 6.65 B 6.62 6.63 6.63 6.64 6.63 C 6.63 6.68 6.61 6.68 6.65 D 6.62 6.61 6.63 6.62 6.62 3 The relation between the velocity v of waves in the sea with its wavelength  , the surface tension  and density  of sea water is given by:  kv = where k = constant of proportionality. If  = (4.30 + 0.05) N m -1,  = (1450 + 20) kg m -3 and the percentage uncertainty in  is 5 %, what is the percentage uncertainty in the velocity of the waves? A 2% B 3% C 4% D 8%

4 4 Two identical ball bearings are dropped simultaneously from rest from different heights as shown below. Air resistance is negligible. As the stones fall, which of the following is true about the distance between them? A The distance will remain the same. B The distance will decrease until they come in contact. C The distance will increase continuously. D The distance will increase initially then remain the same. 5 A device for spraying paint consists of a box with its axes horizontal and vertical. One of its vertical faces contains small holes. Paint is fed into the box under pressure via a vertical tube and exits through the holes as fine horizontal streams. The paint is ejected at a speed of 3.0 m s–1 through 27 holes, each of area 0.4 mm2. The density of the paint is 900 kg m–3. What is the horizontal force required to hold the device stationary as it ejects the paint? A 21 m N B 29 mN C 44 m N D 87 m N

5 [Turn over 6 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 7 An escalator is 60 m long and lifts passengers through a vertical height of 30 m. To drive the escalator against the forces of friction when there are no passengers requires a power of 2.5 kW. The escalator is used by passengers of average mass 62 kg and the power to overcome friction remains constant. How much power is required to drive the escalator when it is carrying 20 passengers and is travelling at 0.75 m s−1? A 4.6 kW B 7.1 kW C 9.1 kW D 11.6 kW

6 8 The engine of a boat supplies a constant power of 110 kW to propel the boat forward. The boat attains a maximum speed of 21.0 m s−1. If the magnitude of the resistive force acting on the boat is proportional to the square of the boat’s speed, what is the resultant force acting on the boat when it is moving at the instant when its speed is 15.0 m s−1? A 2.7 kN B 3.6 kN C 4.7 kN D 7.3 kN 9 An astronomical gas cloud has mass M and radius R. The gravitational potential on its surface S is − 𝐺𝑀 𝑅 and at its centre 0 it is − 3𝐺𝑀 2𝑅 A unit mass is moved slowly by means of an external force from the surface S to the centre O. What is the work done on the mass by the external force? A − 5𝐺𝑀 2𝑅 B − 𝐺𝑀 2𝑅 C 𝐺𝑀 2𝑅 D 5𝐺𝑀 2𝑅 10 On a fairground ride, passengers are rotated in a vertical wheel of radius 4.00 m. Passengers complete one revolution in 3.70s. A passenger of mass 77.0 kg is shown in the diagram when at the top of the wheel and when at the bottom of the wheel. What is the force acting by the wheel on the passenger? force at top force at bottom A 1640 N down 133 N up B 1640 N up 133 N down C 133 N down 1640 N up D 133 N up 1640 N down

7 [Turn over 11 The diagram shows a solar satellite, mass m, positioned directly between the Earth, mass ME, and the Sun, mass Ms. The satellite is a distance r from the Earth and a distance R from the Sun. The satellite rotates in a circle around the Sun once a year and therefore moves around the Sun with the Earth, both having the same angular velocity ω Which force = mass x acceleration equation applies for the satellite? A 𝐺𝑀𝑆𝑚 𝑅2 = 𝑚 × (𝑅𝜔2) B 𝐺𝑀𝐸𝑚 𝑟2 = 𝑚 × (𝑅𝜔2) C 𝐺𝑀𝐸𝑚 𝑟2 − 𝐺𝑀𝑆𝑚 𝑅2 = 𝑚 × (𝑅𝜔2) D 𝐺𝑀𝑆𝑚 𝑅2 − 𝐺𝑀𝐸𝑚 𝑟2 = 𝑚 × (𝑅𝜔2) 12 A satellite orbiting the Earth moves to an orbit further away from the Earth, such that its gravitational potential energy increases by E. By how much does its kinetic energy changes? A It increases by E. B It decreases by E. C It increases by 2 E . D It decreases by 2 E . 13