DHS 2025 H2 Prelim P1

1 © DHS 2025 9749/01 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 PHYSICS Paper 1 Multiple Choice Questions Additional Materials: Multiple Choice Answer Sheet 9749/01 26 September 2025 1 hour READ THESE INSTRUCTIONS FIRST Write your class, index number and name at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are 30 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 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 on this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 17 printed pages and 3 blank pages.

2 © DHS 2025 9749/01 [Turn over 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 © DHS 2025 9749/01 [Turn over Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u2 + 2as work done on/by a gas, W = pV hydrostatic pressure, p = gh gravitational potential,  = −Gm/r temperature, T/K = T/oC + 273.15 pressure of an ideal gas, p = 21 3 Nm cV  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 = 0 2 d I  magnetic flux denxity due to a flat circular coil, B = 0 2 N r I magnetic flux density due to a long solenoid, B = 0nI radioactive decay, x = x0 exp(−t) decay constant,  = 1 2 ln2 t

4 © DHS 2025 9749/01 [Turn over 1 Two students A and B carry out a series of experiments to determine the density of water. The results are tabulated below. The true value for the density of water is 1000 kg m−3. density of water, ρ / kg m−3 Student A Student B 1002 998 997 1001 999 998 998 998 997 997 Which of the following statements below correctly compares the two sets of experimental results? A Results of Student A is more accurate and more precise than those of Student B. B Results of Student A is more accurate and less precise than those of Student B. C Results of Student A is less accurate and more precise than those of Student B. D Results of Student A is less accurate and less precise than those of Student B. 2 An object of mass 3.0 kg is falling vertically from rest. Air resistance R, in newtons, is given by the empirical equation R = 0.60 v where v is the velocity in metres per second. What is the maximum velocity of the object and what is the acceleration of the object when its velocity is 12 m s−1? maximum velocity / m s−1 acceleration when v = 12 m s−1 / m s−2 A 16 2.4 B 16 7.4 C 49 2.4 D 49 7.4

5 © DHS 2025 9749/01 [Turn over 3 When a car driver sees a hazard ahead, she applies the brakes as soon as she can and brings the car to rest. The graph shows how the speed v of the car varies with time t after the hazard is seen. Which graph represents the variation with time t of the distance s travelled by the car after the hazard has been seen? A B C D

6 © DHS 2025 9749/01 [Turn over 4 A lump of ice floats in water as shown. Which statement is correct? A The lump of ice floats because the area of its lower surface is larger than the area of its upper surface. B The pressure difference between the lower and upper surface of the lump of ice give s rise to an upthrust equal to its weight. C The ice has a greater density than the water. D The mass of water displaced by the ice is equal to the upthrust. 5 A uniform diving board of length 5.0 m and mass 50 kg is hinged at one end and supported 2.0 m from this end by a spring of spring constant 10 kN m−1. A child of mass 40 kg stands at the far end of the board. What is the extra compression of the spring caused by the child standing on the end of the board? (Assume the diving board remains horizontal with and without the child standing on it.) A 1.0 cm B 6.1 cm C 9.8 cm D 16 cm ice water

7 © DHS 2025 9749/01 [Turn over 6 A sledge slides down a slope at a constant velocity. The three forces that act on the sledge are the normal contact force C, the weight W and a constant frictional force F. Which diagram represents these forces acting on the sledge? 7 A piston in a gas supply pump has an area of 600 cm 2 and it moves a distance of 40 cm during one stroke. The pump moves the gas against a fixed pressure of 5000 Pa. How much work is done by the piston during one stroke? A 1.2 × 102 J B 1.2 × 104 J C 1.2 × 106 J D 1.2 × 108 J 8 An area of land is at a distance of 2.0 m below sea level. To prevent flooding, pumps are used to lift rainwater up to sea level. What is the minimum pump output power required to lift 1.3 × 109 kg of rainwater per day? A 15 kW B 30 kW C 150 kW D 300 kW 9 The minute hand of a large clock is 3.0 m long. What is the speed at the tip of the minute hand? A 1.7 × 10−3 m s−1 B 5.2 × 10−3 m s−1 C 0.10 m s−1 D 0.31 m s−1 A B C D

8 © DHS 2025 9749/01 [Turn over 10 Two stars of masses M and 2M move in circular motion about their common centre of mass. Which of the following statements is true? A Such a motion is not possible. B Both stars move with the same speed. C Both stars move with the same radius. D Both stars move with the same angular velocity. 11 A spacecraft is launched from the surface of the Earth towards the Moon. In order to reach the Moon with the least effort possible, the spacecraft needs to reach a point P, beyond which it will move towards the Moon without any further input of energy. R is the distance between the Earth and the Moon, ME is the mass of the Earth and MM is the mass of the Moon. What is the distance r, from the centre of the Earth to point P, in terms of R, ME and MM? A 1 E M R M M + B 1M E R M M + C M E M RM   D M E M RM

9 © DHS 2025 9749/01 [Turn over 12 P and Q are two points above Earth’s surface at distances r and 2r respectively from the centre of the Earth. The gravitational potential at P is −800 kJ kg−1. When a 1.00 kg mass is taken from Q to P, what is the work done on the mass? A −400 kJ B −200 kJ C 400