DHS 2022 Prelim P1

© DHS 2022 9749/01 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9749/01 23 September 2022 1 hour READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty 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 in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages.

2 © DHS 2022 9749/01 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 2022 9749/01 [Turn over Formulae uniformly accelerated motion s = 21 2ut at+ v2 = 2 2u as+ 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 = 3 2 kT displacement of particle in s.h.m. x = x0 sin t velocity of particle in s.h.m. v = v0 cos t = 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 = 04 Q r alternating current / voltage x = x0 sin t magnetic flux density due to a long straight wire B = 2 o d   I magnetic flux density due to a flat circular coil B = 2 oN r  I magnetic flux density due to a long solenoid B = on I radioactive decay x = x0 exp(−t) decay constant  = 1 2 ln2 t

4 © DHS 2022 9749/01 1 A computer memory stick is labelled as having a storage capacity of 128 GB. The letter B stands for byte, which is a unit. What is the equivalent storage capacity, in B? A 1.28 × 108 B 1.28 × 109 C 1.28 × 1010 D 1.28 × 1011 2 A steel rule can be read to the nearest millimetre. It is used to measure the length of a bar whose true length is 895 mm. Repeated measurements give the following readings. length / mm 892, 891, 892, 891, 891, 892 Are the readings accurate and precise to within 1 mm? results are accurate to within 1 mm results are precise to within 1 mm A B C D no no yes yes yes no no yes 3 A body having uniform acceleration a increases its velocity from u to v in time t. Which expression would not give a correct value for the body’s displacement during time t?

5 © DHS 2022 9749/01 [Turn over 5 A book of weight W is at rest on a table. A student attempts to state Newton’s third law by saying that ‘action equals reaction’. If the weight of the book is the ‘action’ force, what is the ‘reaction’ force? A The force W acting downwards on the Earth from the table. B The force W acting upwards on the book from the table. C The force W acting upwards on the Earth from the book. D The force W acting upwards on the table from the floor. 4 A sphere is released from a tall building and falls. Which displacement-time graph best represents the motion of the sphere? displacement displacement displacement displacement book table

6 © DHS 2022 9749/01 7 A trailer of weight 30 kN is attached to a cab at X, as shown in the diagram. What is the upward force exerted at X by the cab on the trailer? A 3 kN B 15 kN C 30 kN D 60 kN 8 A solid metal cylinder stands on a horizontal surface, as shown. The cylinder has length x and cross-sectional area A. The cylinder exerts a pressure p on the surface. The acceleration of free fall is g. Which expression gives the density of the metal of the cylinder? A gx pA B pA gx C gx p D p gx 6 A ball drops onto a horizontal surface and bounces elastically. What happens to the kinetic energy of the ball during the very short time that it is in contact with the surface? A The kinetic energy remains constant because it is an elastic collision. B The kinetic energy remains constant in magnitude but changes direction. C The kinetic energy decreases to zero and then returns to its original value. D Most of the kinetic energy is lost as heat and sound. cab trailer surface cylinder area A

7 © DHS 2022 9749/01 [Turn over 9 A car of mass 500 kg is at rest at point X on a slope, as shown. The car’s brakes are released, and the car rolls down the slope with its engine switched off. At point Y the car has moved through a vertical height of 30 m and has a speed of 11 m s-1. What is the energy dissipated by frictional forces when the car moves from X to Y? A 3.0 x 104 J B 1.2 x 105 J C 1.5 x 105 J D 1.8 x 105 J 10 A water pump is driven by an engine. The pump raises a volume of 0.50 m 3 of water in 1.0 minute from a depth of 30 m. The pump has an efficiency of 70%. The density of water is 1000 kg m-3. What is the useful output power from the engine? A 2.5 kW B 3.5 kW C 150 kW D 210 kW 11 Two objects of masses 5.0 kg and 8.0 kg are fixed on a horizontal circular platform 2.0 m and 6.0 m from the centre respectively. When the platform is rotated with uniform circular motion, what is the ratio of the net force on the 5.0 kg mass to the 8.0 kg mass? A 8:15 B 5:24 C 15:8 D 24:5

8 © DHS 2022 9749/01 12 At a point on the surface of a uniform sphere of diameter d, the gravitational field strength due to the sphere is X. What would be the gravitational field strength on the surface of a uniform sphere of the same density but of diameter 2d? A X 4 B X 2 C 2X D 4X 13 A communication satellite is in a geostationary orbit at a height of 3.59 x 10 7 m above the equator. The radius of the Earth is 6.40 x 106 m. How fast is the satellite travelling? A 0.490 km s−1 B 2.60 km s−1 C 3.08 km s−1 D 186 km s−1 14 The two graphs are for the motion of a body undergoing simple harmonic motion. What could the two graphs show? A acceleration with time and velocity with time B acceleration with time and displacement with time C displacement with time and velocity with time D resultant force with time and velocity with time 15 A small mass on a vibrating platform undergoes simple harmonic motion. The total energy of the mass is 18 mJ. The amplitude of the oscillation is now doubled and the time period is tripled. What is the new total energy of the mass? A 8.0 mJ B 12 mJ C 36 mJ D 72 mJ

9 © DHS 2022 9749/01 [Turn over 16 A cathode-ray oscilloscope (CRO) is used to display a wave of frequency 5.0 kHz.