Cambridge A Level Physics 9702 — 2016 Oct/Nov Paper 1 · Variant 2

This document consists of 19 printed pages and 1 blank page. IB16 11_9702_12/3RP © UCLES 2016 [Turn over *1047509797* Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level PHYSICS 9702/12 Paper 1 Multiple Choice October/November 2016 1 hour 15 minutes Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. DO NOT WRITE IN ANY BARCODES. There are forty 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 working should be done in this booklet. Electronic calculators may be used.

2 © UCLES 2016 9702/12/O/N/16 Data speed of light in free space c = 3.00 × 108 m s–1 permeability of free space µ0 = 4π × 10–7 H m–1 permittivity of free space ε0 = 8.85 × 10–12 F m–1 ( 0 4 1 ε π = 8.99 × 109 m F–1) elementary charge e = 1.60 × 10–19 C the Planck constant h = 6.63 × 10–34 J s unified atomic mass unit 1 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 © UCLES 2016 9702/12/O/N/16 [Turn over Formulae uniformly accelerated motion s = ut + 2 2 1 at v 2 = u 2 + 2as work done on/by a gas W = p∆V gravitational potential φ = – r Gm hydrostatic pressure p = ρ gh pressure of an ideal gas p = V Nm 3 1 <c 2> simple harmonic motion a = – ω 2x velocity of particle in s.h.m. v = v0 cos ωt v = ± ω ) ( 2 2 0 x x − Doppler effect of = s s v v v f ± electric potential V = r Q 0 4 ε π capacitors in series 1 / C = 1 / C1 + 1 / C2 + . . . capacitors in parallel C = C1 + C2 + . . . energy of charged capacitor W = QV 2 1 electric current I = Anvq resistors in series R = R1 + R2 + . . . resistors in parallel 1 / R = 1 / R1 + 1 / R2 + . . . Hall voltage VH = ntq BI alternating current/voltage x = x0 sin ωt radioactive decay x = x0 exp(–λt) decay constant λ = 2 1 0.693 t

4 © UCLES 2016 9702/12/O/N/16 1 Concrete has a density of 2400 kg m–3. Which mass of concrete fills a rectangular space of dimensions 8.0 cm × 90 cm × 110 cm? A 79 kg B 190 kg C 790 kg D 1900 kg 2 The speed v of sound in a gas is given by the equation v = ρ γ P where P is the pressure of the gas, ρ is its density and γ is a constant. What are the SI base units of γ ? A m–1 s B m3 s–3 C m–4 s–4 D no units 3 The motion of an object moving from rest with a constant acceleration a may be represented by the equation shown. v 2 = 2as Which row describes the quantities represented by the symbols v and s? v s A scalar scalar B scalar vector C vector scalar D vector vector

5 © UCLES 2016 9702/12/O/N/16 [Turn over 4 A cathode-ray oscilloscope (c.r.o.) displays a waveform as shown. The time interval between two adjacent peaks of the waveform is 0.006 s. What is the time-base setting of the c.r.o.? A 2 µs / division B 20 µs / division C 2 ms / division D 3 ms / division 5 A value for the acceleration of free fall on Earth is given as (10 ± 2) m s–2. Which statement is correct? A The value is accurate but not precise. B The value is both precise and accurate. C The value is neither precise nor accurate. D The value is precise but not accurate. 6 An experiment to determine atmospheric pressure P uses the equation P = ρ gh where ρ = (13 600 ± 100) kg m–3, g = (9.81 ± 0.02) m s–2, h = (0.762 ± 0.005) m. What is the value of P, with its uncertainty, when stated to an appropriate number of significant figures? A (1.0166 ± 0.0162) × 105 Pa B (1.017 ± 0.016) × 105 Pa C (1.017 ± 1.6%) × 105 Pa D (1.02 ± 0.02) × 105 Pa

6 © UCLES 2016 9702/12/O/N/16 7 A lorry travels at a constant speed and then decelerates until it stops. Which graph shows the variation with time of the distance travelled by the lorry? 0 0 A distance time distance time distance time distance time 0 0 B 0 0 C 0 0 D 8 The graph shows the vertical velocity of a parachutist during the first 20 s of her jump. 60 40 20 0 0 5 10 15 time / s velocity / m s–1 20 Approximately how far does she fall before opening the parachute? A 390 m B 570 m C 710 m D 770 m

7 © UCLES 2016 9702/12/O/N/16 [Turn over 9 A girl is jumping on a trampoline. Which graph shows the variation of the girl’s velocity v with time t? A v t 0 0 B v t 0 0 C v t 0 0 D v t 0 0 10 In order that a train can stop safely, it will always pass a signal showing a yellow light before it reaches a signal showing a red light. Drivers apply the brake at the yellow light and this results in a uniform deceleration to stop exactly at the red light. The distance between the red and yellow lights is x. If the speed of the train is increased by 20%, without changing the deceleration of the train, what must be the minimum distance between the lights? A 1.20 x B 1.25 x C 1.44 x D 1.56 x 11 Two frictionless trolleys are moving towards each other along the same horizontal straight line. Their masses and velocities are shown. 2.0 kg 1.0 m s–1 3.0 kg 4.0 m s–1 The trolleys collide and stick together. What is the velocity of the trolleys after the collision? A 2.0 m s–1 to the left B 2.0 m s–1 to the right C 2.8 m s–1 to the left D 2.8 m s–1 to the right 12 A bullet of mass 8.0 g travels at a speed of 300 m s–1. The bullet hits a target and stops after a time of 100 µs. What is the average force exerted by the target on the bullet? A 24 N B 240 N C 2400 N D 24 000 N

8 © UCLES 2016 9702/12/O/N/16 13 A light ball is falling vertically through air. The variation with time t of the resistive force FR acting on the ball is shown. t1 t2 0 FR time t At which times are the speed of the ball zero, the speed at a maximum and the acceleration zero? zero speed maximum speed zero acceleration A t1 t2 t1 B t1 t2 t2 C t2 t1 t1 D t2 t1 t2 14 Which diagram best shows the forces acting on a ball falling at a constant velocity through a liquid? viscous drag viscous drag upthrust upthrust viscous drag upthrust A B C D weight weight weight weight

9 © UCLES 2016 9702/12/O/N/16 [Turn over 15 A minimum torque of 20 N m must be applied to the lid of a jar for it to open. The radius of the lid is 4.0 cm. F F 4.0 cm What is the minimum force F that must act on each side of the lid in order to open it? A 2.5 N B 5.0 N C 250 N D 500 N 16 The diagram shows the brake system of a car. force from foot on brake pedal force from pistons on brakes The pipes are filled with incompressible liquid. When a force is applied to the brake pedal, the pressure in the liquid increases and applies a force to each of the four wheels. The area of the piston connected to the brake pedal is 8 cm2. The area of each piston connected to the brakes is 12 cm2. A force of 800 N is applied by the foot to the brake pedal. What is the force applied to each brake? A 300 N B 530 N C 1200 N D 4800 N

10 © UCLES 2016 9702/12/O/N/16 17 A rigid cross-shaped structure having four arms PO, SO, QO and RO, each 1.00 m long, is pivoted at O. Forces act on the ends of the arms and on the midpoints of the arms as shown. 30 N 30 N 20 N 20 N 70 N 70 N 50 N 50 N R S P Q O What is the magnitude of the resultant moment on the structure about O? A 45 N m B 90 N m C 120 N m D 190 N m 18 On the surface of a planet, 30 J of work is done against gravity to raise a mass of 1.0 kg through a height of 10 m. How much work must be done to raise a mass of 4.0 kg through a height of 5.0 m on this planet? A 15 J B 60 J C 120 J D 200 J 19 The speed of a car increases from 10 m s–1 to 15 m s–1 and its kinetic energy increases by E1. Later, the speed of the car increases from 15 m s–1 to 25 m s–1 and its kinetic energy increases by E2. What is the ratio 1 2 E E ? A 1.6 B 2.6 C 3.2 D 4.0 20 A car travels at a constant speed of 25 m s–1 up a slope. The wheels driven by the engine exert a forward force of 3000 N. There is a drag force due to air resistance and friction of 2100 N. The weight of the car has a component down the slope of 900 N. What is the rate at which thermal energy is dissipated? A zero B 2.3 × 104 W C 5.3 × 104 W D 7.5 × 104 W

11 © UCLES 2016 9702/12/O/N/16 [Turn over 21 Which force-extension graph shows plastic deformation of a sample of material? 0 0 A force extension 0 0 B force extension 0 0 C force extension 0 0 D force extension 22 Four solid steel rods, each of length 2.0 m and cross-sectional area 250 mm2, equally support an object weighing 10 kN. The weight of the object causes the rods to contract by 0.10 mm. What is the Young modulus of steel? A 2.0 × 108 N m–2 B 2.0 × 1011 N m–2 C 8.0 × 108 N m–2 D 8.0 × 1011 N m–2 23 High-frequency sound waves with frequency 2.0 MHz travel with a speed of 2.0 km s–1 through a liquid. What is the shortest distance between a compression and a rarefaction (expansion) in the liquid? A 0.5 mm B 1.0 mm C 5.0 mm D 10.0 mm

12 © UCLES 2016 9702/12/O/N/16 24 A transverse progressive wave of wavelength λ is set up on a stretched string. The graph shows the variation of displacement y with distance x at a particular instant of time. The displacement where distance x = 8 λ is y1. 0 y1 y x 0 2 λ 8 λ 2 3λ 2λ λ 2 5λ What are the next two values of x where the displacement y is again equal to y1? A 8 3λ and 8 5λ B 8 3λ and 8 9λ C 8 5λ and 8 9λ D 8 9λ and 8 17λ 25 A man standing next to a stationary train hears sound of frequency 400 Hz emitted from the train’s horn. The train then moves directly away from the man and sounds its horn when it has a speed of 50 m s–1. The speed of sound is 340 m s–1. What is the difference in frequency of the sound heard by the man on the two occasions? A 51 Hz B 69 Hz C 349 Hz D 469 Hz

13 © UCLES 2016 9702/12/O/N/16 [Turn over 26 A stationary wave is formed on a stretched string. The diagram illustrates the string at an instant of time when the displacement of the string is at its maximum. fixed point fixed point P string The frequency of the wave is 250 Hz. Point P on the string has a vertical displacement of –1.0 mm. What will be the vertical displacement of the point P after a time of 5 ms? A –1.0 mm B zero C +0.5 mm D +1.0 mm 27 Observable interference fringes are produced using light from a double slit. The intensity of the light emerging from each slit is initially the same. The intensity of the light emerging from one of the slits is now reduced. How does this affect the interference pattern? A The bright fringes and the dark fringes all become brighter. B The bright fringes and the dark fringes all become darker. C The bright fringes become brighter and the dark fringes become darker. D The bright fringes become darker and the dark fringes become brighter. 28 Monochromatic light of wavelength 450 nm passes through two parallel slits 0.30 mm apart. Bright fringes are observed on a screen 2.0 m away. 0.30 mm 2.0 m slits screen (not to scale) How far apart are the bright fringes on the screen? A 1.3 mm B 1.5 mm C 3.0 mm D 6.0 mm

14 © UCLES 2016 9702/12/O/N/16 29 A microwave transmitter is placed at a fixed distance from a flat reflecting surface, as shown. microwave transmitter microwave detector movement of detector reflecting surface X Y A microwave detector is moved steadily in a straight line from X to Y. A series of maxima and minima of intensity is obtained. The distance between adjacent maxima is 1.5 cm. What is the frequency of the microwave radiation? A 1.0 × 108 Hz B 2.0 × 108 Hz C 1.0 × 1010 Hz D 2.0 × 1010 Hz 30 Two parallel circular metal plates X and Y, each of diameter 18 cm, have a separation of 9.0 cm. A potential difference of 9.0 V is applied between them. – + 9.0 V 9.0 cm 18 cm 3.0 cm 6.0 cm plate X plate Y P Point P is 6.0 cm from the surface of plate X and 3.0 cm from the surface of plate Y. What is the electric field strength at P? A 50 N C–1 B 100 N C–1 C 150 N C–1 D 300 N C–1

15 © UCLES 2016 9702/12/O/N/16 [Turn over 31 An oil drop has mass m and charge q. The drop is held stationary in an electric field between two parallel horizontal plates, distance d apart, as shown. d V oil drop The potential difference between the plates is V and the acceleration of free fall is g. What is the charge-to-mass ratio m q of the oil drop? A V gd B dg V C d gV D Vg d 32 The diagram shows a junction in a circuit where three wires P, Q and R meet. The currents in P and Q are 1 A and 3 A respectively, in the directions shown. P 1 A 3 A R Q How much charge passes a given point in wire R in a time of 5 s? A 0.4 C B 2 C C 10 C D 20 C 33 A wire carries a current of 2.0 A for 1.0 hour. How many electrons pass a point in the wire in this time? A 1.2 × 10–15 B 7.2 × 103 C 1.3 × 1019 D 4.5 × 1022

16 © UCLES 2016 9702/12/O/N/16 34 The diagram shows an electric circuit in which the resistance of the external resistor is 2R and the internal resistance of the source is R. 2R R What is the ratio resistor external in power resistance internal in power ? A 4 1 B 2 1 C 2 D 4 35 The graph shows the variation with potential difference V of the current I in components X, Y and Z. I V 0 0 X Z Y Which row correctly identifies the components? metallic conductor at constant temperature semiconductor diode filament lamp A X Z Y B Y X Z C Y Z X D Z Y X

17 © UCLES 2016 9702/12/O/N/16 [Turn over 36 Four statements about either potential difference or electromotive force are listed. 1 It involves changing electrical energy into other forms. 2 It involves changing other energy forms into electrical energy. 3 It is the energy per unit charge to move charge around a complete circuit. 4 It is the work done per unit charge by the charge moving from one point to another. Which statements apply to potential difference and which apply to electromotive force? potential difference electromotive force A 1 and 3 2 and 4 B 1 and 4 2 and 3 C 2 and 3 1 and 4 D 2 and 4 1 and 3 37 In the circuit shown, there is a current of 3.0 A in the 2.0 Ω resistor. 2.0 Ω 1.5 Ω 6.0 Ω V + – 3.0 A I What are the values of the current I delivered by the power supply and the voltage V across it? I / A V / V A 3.0 10.5 B 4.0 9.0 C 4.0 12 D 12 18

18 © UCLES 2016 9702/12/O/N/16 38 In the circuit below, P is a potentiometer of total resistance 10 Ω and Q is a fixed resistor of resistance 10 Ω. The battery has an e.m.f. of 4.0 V and negligible internal resistance. The voltmeter has a very high resistance. 4.0 V X Y P Q V The slider on the potentiometer is moved from X to Y and a graph of voltmeter reading V is plotted against slider position. Which graph is obtained? X B slider position Y V X A slider position Y V X C slider position Y V 0 X D slider position Y V 4 2 0 4 2 0 4 2 0 4 2

19 © UCLES 2016 9702/12/O/N/16 39 The calcium nuclide Ca 42 20 is formed by β– decay. What are the nucleon (mass) number and proton (atomic) number of the unstable nuclide that underwent β– decay to form the calcium nuclide? nucleon number proton number A 41 19 B 41 21 C 42 19 D 42 21 40 Which diagram represents the structure of an antineutron? u d u d A u d d B u d u C u d d D u u d up quark down quark up antiquark down antiquark key

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® IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 2 printed pages. © UCLES 2016 [Turn over Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level PHYSICS 9702/12 Paper 1 Multiple Choice October/November 2016 MARK SCHEME Maximum Mark: 40 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE®, Cambridge International A and AS Level components and some Cambridge O Level components.

Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A Level – October/November 2016 9702 12 © UCLES 2016 Question Number Key Question Number Key 1 B 21 D 2 D 22 B 3 D 23 A 4 C 24 B 5 A 25 A 6 D 26 B 7 B 27 D 8 B 28 C 9 D 29 C 10 C 30 B 11 A 31 A 12 D 32 C 13 B 33 D 14 D 34 B 15 C 35 B 16 C 36 B 17 C 37 C 18 B 38 A 19 C 39 C 20 C 40 A