2024 DHS Promo Physics H2 Questions P1 final

1 © DHS 2024 9749/01 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Promotional Examination Year 5 H2 PHYSICS Paper 1 Multiple Choice Questions Additional Materials: Multiple Choice Answer Sheet 9749/01 1 October 2024 30 minutes 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 fifteen 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The use of an approved scientific calculator is expected, where appropriate. Write your name and class o n the Multiple Choice Answer Sheet. Write and shade the Index Number as follows. For illustration only: A student from class 5C99, with index number 02, should shade “9902”. 9 9 0 2 This document consists of 11 printed pages and 1 blank page.

© DHS 2024 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 2024 9749/01 [Turn over Formulae uniformly accelerated motion s ut at 21 2=+ v u as22 2=+ work done on / by a gas W p V= hydrostatic pressure p gh= gravitational potential Gm r =− temperature TT o/ K / C 273.15=+ pressure of an ideal gas Nmpc V 21 3=   mean translational kinetic energy of an E kT3 2= ideal gas molecule displacement of particle in s.h.m. x x t 0 sin= velocity of particle in s.h.m. v v t 0 cos= ( )xx22 0 = − electric current Anvq=I resistors in series R R R12 ...= + + resistors in parallel R R R 211 1 1 ...= + + electric potential QV r04= alternating current / voltage x x t 0 sin= magnetic flux density due to a long straight wire B d 0 2  = I magnetic flux denxity due to a flat circular coil 0 2 NB r = I magnetic flux density due to a long solenoid 0Bn = I radioactive decay ( )x x t 0 exp =− decay constant t 1 2 ln2 =

4 © DHS 2024 9749/01 1 Which of the following options gives the best estimate for the size of a hydrogen atom? A 10−8 m B 10−9 m C 10−10 m D 10−11 m 2 Four students made a series of measurements for the acceleration of free fall, g. Which student’s data can be said to be precise but not accurate? Student Results, g / m s−2 A 9.81 9.72 9.84 9.83 B 9.81 10.12 9.89 8.94 C 9.45 9.21 8.99 8.76 D 8.45 8.46 8.50 8.41 3 A ball, thrown at an angle with the horizontal, travels in air with a trajectory as shown below. When the ball is at the top of its flight, which of the following shows the direction of its resultant acceleration? A B C D

5 © DHS 2024 9749/01 [Turn over 4 The diagram shows a woman standing in a lift. The forces acting on the woman and the forces acting on the lift are shown below. Which statement is correct? A N and W1 are always equal and opposite. B If T = (D + W2), the lift must have a constant velocity. C If N = W1, the lift must be at rest. D (W1 + W2) is always equal to T. N is the force from the lift floor on the woman. W1 is the weight of the woman. T is the tension in the lift cable. W2 is the weight of the lift. D is the force from the woman on the lift floor.

6 © DHS 2024 9749/01 5 A racing car of mass 500 kg, including driver but not fuel, decelerates from a speed of 50 m s−1 to 30 m s−1 when approaching a bend. The brakes exert a fixed retarding force of 7000 N. The time for the car to decelerate when it is almost out of fuel is t1. The time for the car to decelerate when it has a full load of 130 kg of fuel is t2. What is the difference between (t2 − t1)? A 0.37 s B 0.56 s C 0.93 s D 1.43 s 6 A wire W, initially of length L, is fixed at one end and pulled by a force F at the other end. The wire extends by x. Three wires, all identical to wire W, are connected as shown to form a composite wire. The composite wire is fixed at one end and pulled by the same force F at the other end. What is the total extension of the composite wire? A 5 6 x B 4 3 x C 3 2 x D 2x F x wire W fixed L F fixed L L L

7 © DHS 2024 9749/01 [Turn over 7 Two forces, each of magnitude F, act along the edges of a light rigid card, as shown. The card has length a and width b. What is the torque about point P? A Fa B Fb C 2Fa D 2Fb 8 An area of land is at an average depth of 2.0 m below the sea level. To prevent flooding, pumps are used to lift rainwater up to the sea level. What is the minimum pump output power required to deal with 1.3 × 109 kg of rain per day? A 15 kW B 30 kW C 150 kW D 300 kW 9 A metal wire is stretched by a load. The force-extension graph is shown below. What is represented by the area under the whole graph? A the change in gravitational potential energy of the wire. B the work done in stretching the wire. C the energy transferred into heat energy in the wire. D the energy that would be released from the wire if the final load was removed. b a . P F F

8 © DHS 2024 9749/01 10 A stone of mass M and weight W is attached to a string and is rotat ed in a vertical circle of radius r. The stone has an angular velocity ω when it is vertically above the centre of the circle. What is the tension in the string when the stone is vertically below the centre of the circle? A 2Mr W − B 2Mr C 2W Mr − D 2W Mr + 11 The variation of the gravitational potential ϕ with the distance r from the surface of the Moon to the surface of Earth, is shown below. Which of the following statements is not true? A The gravitational field strength at P is zero. B The gravitational field strength at P is the vector sum of the individual field strengths of the Moon and the Earth at point P. C The gravitational field strength at P is the scalar sum of the individual field strengths of the Moon and the Earth at point P. D The gravitational field strength at P is given by the rate of change of ϕ with respect to r. Moon r 𝜙 Earth . P

9 © DHS 2024 9749/01 [Turn over 12 The diagram shows one possible graph for an object undergoing simple harmonic motion. Which row in the table gives the correct quantities x and y? x y A displacement acceleration B time acceleration C time displacement D velocity displacement x y 0

10 © DHS 2024 9749/01 13 A vertical spring -mass system, with a plasticine ball as the mass, is forced to oscillate at different frequencies f in air. The mass oscillates at maximum amplitude when f is equal to f0, as shown below. The plasticine is now flattened to increase its surface area , reattached to the spring and the experiment is repeated. Which of the following graphs best represents t