Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level

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1 * * ambridge International Examinations ambridge International dvanced Subsidiary and dvanced Level PHYSIS 972/12 Paper 1 Multiple hoice February/March 216 dditional Materials: Multiple hoice nswer Sheet Soft clean eraser Soft pencil (type or H is recommended) 1 hour 15 minutes RE THESE INSTRUTIONS FIRST Write in soft pencil. o not use staples, paper clips, glue or correction fluid. Write your name, entre number and candidate number on the nswer Sheet in the spaces provided unless this has been done for you. O NOT WRITE IN NY ROES. There are forty questions on this paper. nswer all questions. For each question there are four possible answers,, and. hoose the one you consider correct and record your choice in soft pencil on the separate nswer Sheet. Read the instructions on the nswer Sheet very carefully. Each correct answer will score one mark. mark will not be deducted for a wrong answer. ny working should be done in this booklet. Electronic calculators may be used. This document consists of 17 printed pages and 3 blank pages. I16 3_972_12/7RP ULES 216 [Turn over

2 2 ata speed of light in free space c = m s 1 permeability of free space µ = 4π 1 7 H m 1 permittivity of free space ε = F m 1 1 ( = m F 1 ) 4πε elementary charge the Planck constant unified atomic mass unit rest mass of electron rest mass of proton e = h = J s 1 u = kg m e = kg m p = kg molar gas constant R = 8.31 J K 1 mol 1 the vogadro constant N = mol 1 the oltzmann constant k = J K 1 gravitational constant G = N m 2 kg 2 acceleration of free fall g = 9.81 m s 2 ULES /12/F/M/16

3 3 Formulae 2 uniformly accelerated motion s = ut + 1 at 2 v 2 = u 2 + 2as work done on/by a gas W = p V gravitational potential φ = Gm r hydrostatic pressure p = ρ gh pressure of an ideal gas p = 1 Nm <c 2 > 3 V simple harmonic motion velocity of particle in s.h.m. a = ω 2 x v = v cos ωt 2 2 x v = ± ω ( x ) oppler effect f = o electric potential V = fsv v ± v s Q 4πε r capacitors in series 1 / = 1 / / capacitors in parallel = energy of charged capacitor electric current 1 W = QV 2 I = nvq resistors in series R = R 1 + R resistors in parallel 1 / R = 1 / R / R Hall voltage alternating current/voltage I V H = ntq x = x sin ωt radioactive decay x = x exp( λt) decay constant λ =.693 t 1 2 ULES /12/F/M/16 [Turn over

4 4 1 The prefixes nano (n), micro (µ) and pico (p) are often used with units. Which row shows their correct values? n µ p crane has an arm to which is attached a frictionless pulley. cable passes over the pulley and supports a load of 1 kn as shown. F 1 kn 3 3 frictionless pulley crane arm load 1 kn The crane arm exerts a force F on the pulley. What is the value of F? 5. kn 8.7 kn 1 kn 17 kn 3 The SI unit of specific heat capacity is J kg 1 K 1. What is the unit of specific heat capacity expressed in SI base units? m s 2 K 1 kg m s 1 K 1 m 2 s 2 K 1 kg m 2 s 1 K 1 4 Quantity X has a fractional uncertainty of x. Quantity Y has a fractional uncertainty of y. What is the fractional uncertainty in X 2? Y x + y x y x + 2y x 2y ULES /12/F/M/16

5 5 PQR and XYZ are wires in a circuit. galvanometer connects Q and Y as a null indicator. 5 P Q R X Y Z When the galvanometer reads zero, which statement is correct? The potential difference between Q and Y is infinite. The potential difference between Q and Y is zero. The resistance between Q and Y is infinite. The resistance between Q and Y is zero. 6 n object has an initial velocity u and an acceleration a. The object moves in a straight line through a displacement s and has final velocity v. The above quantities are related by the equation shown. v 2 = u 2 + 2as Which condition must be satisfied in order for this equation to apply to the motion of the object? The direction of a is constant and the direction of a is the same as the direction of s. The direction of a is constant and the direction of a is the same as the direction of u. The magnitude of a is constant and the direction of a is constant. The magnitude of a is constant and the direction of a is the same as the direction of v. 7 car is travelling at constant velocity. Its brakes are then applied, causing uniform deceleration. Which graph shows the variation with distance s of the velocity v of the car? v v v v s s s s ULES /12/F/M/16 [Turn over

6 6 8 ball is thrown across a flat field. path of ball Which statement describes the motion of the ball, when the effects of air resistance are ignored? The ball lands with the same velocity at which it is thrown. The horizontal component of acceleration is constant throughout the motion. The horizontal and vertical components of acceleration are both zero at the highest point of the motion. The horizontal and vertical components of velocity are both zero at the highest point of the motion. 9 Which statement defines force? When a force acts on a body that is free to move, the force is the product of the mass of the body and its acceleration. When a force acts on a body that is free to move, the force is the rate of change of momentum of the body. When a force acts on a body that is free to move, the force is the work done by the force divided by the distance moved by the body. When a force acts on a lever and causes a moment, the force is the moment divided by the perpendicular distance of the force from the pivot. ULES /12/F/M/16

7 7 1 particle of mass m, travelling with speed u, collides with a stationary particle of mass M. The velocities of the two particles before and after the collision are shown. u 3 u α M m M β m u 2 before collision after collision Which vector diagram correctly shows the momenta before and after the collision? α mu β β mu α mu 2 Mu 3 mu 2 Mu 3 α mu β β mu α mu 2 Mu 3 mu 2 Mu 3 ULES /12/F/M/16 [Turn over

8 8 11 n object falls freely from rest in a vacuum. The graph shows the variation with time t of the velocity v of the object. v t Which graph, using the same scales, represents the object falling in air? v v v v t t t t 12 The diagram shows a uniform beam PQ. The length of the beam is 3. m and its weight is 5 N. The beam is supported on a pivot 1. m from end P. load of weight W is hung from end P and the beam is in equilibrium. 3. m P 1. m Q W pivot What is the value of W? 25 N 5 N 75 N 1 N ULES /12/F/M/16

9 13 Two forces, each of magnitude F, act at points V and W on an object. 9 The two forces form a couple. The shape of the object is a right-angled triangle with sides of lengths x and y, as shown. F V y x W F Which expression gives the torque exerted by the couple? Fx Fy 2Fx 2Fy 14 giant squid of length 2. m is vertical in seawater, with the top of the squid at a depth of 8. m. The density of seawater is 15 kg m 3. What is the difference in pressure between the top and the bottom of the squid? 82 Pa 26 Pa 288 Pa 389 Pa 15 The force diagram shows an aircraft accelerating. t the instant shown, the velocity of the aircraft is 4 m s 1. velocity 4 m s 1 6 kn lift 2 kn air resistance 5 kn engine thrust t which rate is its kinetic energy increasing? 6 kn weight 2.4 MW 8. MW 12 MW 2 MW 16 man is running in a straight line. What is an approximate value of his kinetic energy? 1 J 1 J 1 J 1 J ULES /12/F/M/16 [Turn over

10 1 17 The pump of a water pumping system uses 2. kw of electrical power when raising water. The pumping system lifts 16 kg of water per second through a vertical height of 7. m. What is the efficiency of the pumping system? 1.8% 5.6% 22% 55% 18 metal wire is stretched by a load. The force-extension graph is shown. force extension What is represented by the area under the whole graph? the change in gravitational potential energy of the wire the energy that would be released from the wire if the final load was removed the energy transferred into heat energy in the wire the work done in stretching the wire 19 The Young modulus of steel is twice that of copper. 5 cm length of copper wire of diameter 2. mm is joined to a 5 cm length of steel wire of diameter 1. mm, making a combination wire of length 1. m, as shown. fixed support copper wire steel wire weight The combination wire is stretched by a weight added to its end. oth the copper and the steel wires obey Hooke s law. What is the ratio extension of steel wire? extension of copper wire ULES /12/F/M/16

11 11 2 With which types of wave can the oppler shift be observed? all types of wave light and sound waves only sound waves and water waves only sound waves only 21 distant star is receding from the Earth with a speed of m s 1. It emits light of frequency Hz. The speed of light is m s 1. The oppler effect formula can be used with light waves. What will be the frequency of this light when detected on Earth? Hz Hz Hz Hz 22 The graph shows the variation with time of the displacement of two separate waves X and Y. displacement wave Y wave X time Wave X has frequency f and amplitude. What is the frequency and what is the amplitude of wave Y? frequency amplitude 1 f f 2 2 2f 1 2 2f 2 ULES /12/F/M/16 [Turn over

12 23 iffraction is a term used to describe one aspect of wave behaviour. What does diffraction make possible? 12 the ability to hear around corners the ability to hear high frequency and low frequency sound waves the ability to hear loud and quiet sounds the ability to hear sound through a brick wall 24 The diagram represents the pattern of stationary waves formed by the superposition of sound waves from a loudspeaker and their reflection from a metal sheet (not shown). W X Y Z W, X, Y and Z are four points on the line through the centre of these waves. Which statement about these stationary waves is correct? n antinode is formed at the surface of the metal sheet. node is a quarter of a wavelength from an adjacent antinode. The oscillations at X are in phase with those at Y. The air particles oscillate perpendicular to the line WZ. 25 musical instrument called a bugle is a long tube with a mouthpiece at one end. The other end is open and flared, as shown. musician maintains stationary sound waves with a node at the mouthpiece and an antinode at the other end. The lowest frequency of sound that the bugle can produce is 92 Hz. Which different frequencies of sound can be produced by the bugle? 92 Hz, 138 Hz, 184 Hz, 23 Hz, 276 Hz 92 Hz, 184 Hz, 276 Hz, 368 Hz, 46 Hz 92 Hz, 276 Hz, 46 Hz, 644 Hz, 828 Hz 92 Hz, 276 Hz, 828 Hz, 2484 Hz, 7452 Hz 26 Monochromatic light of wavelength m is incident normally on a diffraction grating. The first order maximum is observed at an angle of 15.4 to the direction of the incident light. What is the angle between the first and second order diffraction maxima? ULES /12/F/M/16

13 13 27 The diagram shows an electron in a uniform electric field. In which direction will the field accelerate the electron? electron electric field 28 The electric field strength at a certain distance from an isolated alpha particle is N 1. What is the force on an electron when at that distance from the alpha particle? N N N N 29 Two large parallel plates X and Y are placed a distance of 5. mm apart and connected to the terminals of a 2 V d.c. supply, as shown. X Y P 5. mm 2 V small oil drop at P carries one excess electron. What is the magnitude of the electrostatic force acting on the oil drop due to the electric field between the plates? N N N N ULES /12/F/M/16 [Turn over

14 14 3 n electrical conductor has a resistance of 5.6 kω. potential difference (p.d.) of 9. V is applied across its ends. How many electrons pass a point in the conductor in one minute? fixed resistor of resistance 12 Ω is connected to a battery. There is a current of.2 in the resistor. The current is now doubled. What is the new power dissipated in the resistor?.48 W.96 W 1.92 W 4.8 W 32 Which measurements are taken in order to calculate the resistivity of the metal of a piece of wire? p.d., current, area, length p.d., current, diameter, length resistance, area, length resistance, length, radius V battery is charged for 2 minutes by connecting it to a source of electromotive force (e.m.f.). The battery is supplied with J of energy in this time. How much charge flows through the battery? ULES /12/F/M/16

15 15 34 Three cells with e.m.f.s V 1, V 2 and V 3, have negligible internal resistance. These cells are connected to three resistors with resistances R 1, R 2 and R 3, as shown. I R 1 V 1 V 2 V R 2 R 3 3 The current in the circuit is I. Which equation is correct? V 1 + V 2 + V 3 = I (R 1 + R 2 + R 3 ) V 1 + V 2 V 3 = I (R 1 + R 2 + R 3 ) V 1 V 2 + V 3 = I (R 1 + R 2 + R 3 ) V 1 V 2 V 3 = I (R 1 + R 2 + R 3 ) 35 Three resistors, each of resistance R, are connected in a network, as shown. R X R R Y The total resistance between points X and Y is 8. Ω. What is the value of R? 2.7 Ω 4. Ω 5.3 Ω 12 Ω 36 In deriving a formula for the combined resistance of three different resistors in series, Kirchhoff s laws are used. Which physics principle is involved in this derivation? the conservation of charge the direction of the flow of charge is from negative to positive the potential difference across each resistor is the same the current varies in each resistor, in proportion to the resistor value ULES /12/F/M/16 [Turn over

16 16 37 The battery of a car has an internal resistance of.1 Ω and an electromotive force of 12 V. When the battery is connected to the starter motor, the potential difference across the battery terminals is 7. V. What is the current supplied to the starter motor? sample of an isotope emits β particles. The emitted β particles have a range of energies. What must also be emitted? antineutrinos neutrinos antineutrons neutrons 39 nucleus of magnesium decays into a nucleus of sodium by emitting a β + particle. The decay is represented by the equation shown. What are the values of P and Q? P 12 Q Na + β 23 Mg + 1 P Q ULES /12/F/M/16

17 17 4 Thorium-234 ( Th) decays by β emission into a daughter product which in turn decays by a further β emission into a granddaughter product. Which letter in the diagram represents the granddaughter product? proton number nucleon number ULES /12/F/M/16

18 18 LNK PGE ULES /12/F/M/16

19 19 LNK PGE ULES /12/F/M/16

20 2 LNK PGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (ULES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the ambridge International Examinations opyright cknowledgements ooklet. This is produced for each series of examinations and is freely available to download at after the live examination series. ambridge International Examinations is part of the ambridge ssessment Group. ambridge ssessment is the brand name of University of ambridge Local Examinations Syndicate (ULES), which is itself a department of the University of ambridge. ULES /12/F/M/16

Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level

Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level *9549161616* PHYSICS 9702/21 Paper 2 AS Level Structured Questions October/November 2017 1 hour 15 minutes