M12/4/PHYSI/HPM/ENG/TZ1/XX 22126507 Pysics Higer level Paper 1 Tursday 10 May 2012 (afternoon) 1 our INSTRUCTIONS TO CANDIDATES Do not open tis examination paper until instructed to do so. Answer all te questions. For eac question, coose te answer you consider to be te best and indicate your coice on te answer seet provided. A clean copy of te Pysics Data Booklet is required for tis paper. Te maximum mark for tis examination paper is [40 marks]. 16 pages International Baccalaureate Organization 2012
2 M12/4/PHYSI/HPM/ENG/TZ1/XX 1. Te diagram below sows te forces acting on a block of weigt W as it slides down a slope. Te angle between te slope and te orizontal is θ, te normal reaction force on te block from te slope is N and friction is negligible. θ N θ W θ Wic of te following gives te resultant force on te block? A. W sin θ B. W cos θ C. N sin θ D. N cos θ
3 M12/4/PHYSI/HPM/ENG/TZ1/XX 2. Te velocity time grap for an accelerating object tat is travelling in a straigt line is sown below. 5.0 4.0 velocity / m s 1 3.0 2.0 1.0 0 0 1.0 2.0 3.0 4.0 5.0 time / s Wic of te following is te cange in displacement of te object in te first 5.0 seconds? A. 25.0 m B. 12.5 m C. 5.0 m D. 1.0 m 3. Te momentum of an object canges by p in a time t. Wat is te impulse acting on te object during tis cange? A. p B. p t C. p t D. zero Turn over
4. A pendulum swings back and fort in a circular arc between X and Y. 4 M12/4/PHYSI/HPM/ENG/TZ1/XX X Y Te pendulum bob is A. always in equilibrium. B. only in equilibrium at X and Y. C. in equilibrium as it passes troug te central position. D. never in equilibrium. 5. A car moves at constant speed around a orizontal circular track. Te resultant force on te car is always equal to A. te forward force from te engine. B. te sideways friction between te tyres and te track. C. te weigt of te car. D. zero. 6. An ideal gas as an absolute temperature T. Te average random kinetic energy of te molecules of te gas is A. independent of T. B. equal to T. C. proportional to T. D. inversely proportional to T.
5 M12/4/PHYSI/HPM/ENG/TZ1/XX 7. In te P V diagram below, wic line could represent an adiabatic cange for an ideal gas? P A. D. B. C. 0 0 V 8. Te entropy of a system A. will decrease if te system s temperature is increased. B. is related to te degree of disorder in te system. C. must always increase. D. is always conserved. 9. An object is undergoing simple armonic motion (SHM) about a fixed point P. Te magnitude of its displacement from P is x. Wic of te following is correct? Magnitude of resultant force Direction of resultant force A. proportional to x towards P B. inversely proportional to x towards P C. proportional to x away from P D. inversely proportional to x away from P Turn over
6 M12/4/PHYSI/HPM/ENG/TZ1/XX 10. Wic of te following gives te conditions for maximum amplitude in forced, but damped, oscillations? Driving frequency Damping A. greater tan natural frequency as large as possible B. equal to natural frequency as large as possible C. greater tan natural frequency as small as possible D. equal to natural frequency as small as possible 11. A ray of ligt travels from a vacuum into glass as sown below. vacuum glass In glass, ligt as speed v. In a vacuum, ligt as speed c. Wic of te following gives te refractive index of glass? A. B. C. D. c v v c sin c sin v sin v sin c
7 M12/4/PHYSI/HPM/ENG/TZ1/XX 12. A transverse standing wave is establised on a string. Consider te following pase differences. I. 0 II. III. 90 180 Wic of te following gives all te possible pase differences between te oscillations of any two particles in te standing wave? A. I only B. I and III only C. II and III only D. I, II and III 13. Wic of te following would be diffracted te most wen incident on a slit of widt 1 cm? A. microwaves B. red ligt C. ultraviolet D. X-rays 14. Two point sources of ligt ave an angular separation of θ, as measured by a distant observer. Te ligt passes troug a circular aperture of radius r just before reacing te observer. Wic of te following conditions must be true for te two sources to be resolved? A. 0.61 r λ θ < B. 1.22 r λ θ < C. 0.61 r λ θ D. 1.22 r λ θ Turn over
8 M12/4/PHYSI/HPM/ENG/TZ1/XX 15. A beam of unpolarized ligt is incident on te surface of a liquid and is partially reflected and partially refracted as sown below. incident ray reflected ray 50 40 air surface liquid refracted ray Te reflected ligt is completely orizontally polarized. Wic of te following is te refractive index of te liquid? A. tan 40 B. tan 50 C. D. sin 40 sin50 sin 40 cos50 16. A battery of emf 6.0 V is connected to a 2.0 Ω resistor. Te current in te circuit is 2.0 A. Te internal resistance of te battery is A. zero. B. 1.0 Ω. C. 3.0 Ω. D. 4.0 Ω.
9 M12/4/PHYSI/HPM/ENG/TZ1/XX 17. Wic of te following gives te resistances of an ideal ammeter and an ideal voltmeter? Resistance of ideal ammeter Resistance of ideal voltmeter A. infinite infinite B. zero infinite C. infinite zero D. zero zero 18. A mass at point X gives rise to a gravitational field strengt g at point P as sown below. X P An identical mass is placed at point Y as sown below. X P Y Te resultant gravitational field strengt at P is now A. greater tan 2g. B. between 2g and g. C. between g and zero. D. zero. Turn over
10 M12/4/PHYSI/HPM/ENG/TZ1/XX 19. A proton p is at rest between te poles of two orizontal magnets as sown below. top S N S N p bottom Te magnetic force on te proton is A. from left to rigt. B. from top to bottom. C. into te plane of te paper. D. zero. 20. A gun fires a bullet of mass m at a orizontal velocity of v. Air resistance on te bullet is negligible. A cange in wic of te following will affect te time for te bullet to it te ground? A. m only B. v only C. m and v D. neiter m nor v 21. At te surface of a planet of radius r, te gravitational potential is 6.4 10 7 J kg 1. Te gravitational potential at a eigt of r above te surface is A. 12.8 10 7 J kg 1. B. 6.4 10 7 J kg 1. C. 3.2 10 7 J kg 1. D. 1.6 10 7 J kg 1.
11 M12/4/PHYSI/HPM/ENG/TZ1/XX 22. An astronaut of mass 60 kg is on board te International Space Station, wic is in low orbit around te Eart. Te gravitational force of attraction between te Eart and astronaut is approximately A. zero. B. 6 N. C. 60 N. D. 600 N. 23. A lengt of copper wire PQ is moved downwards troug te poles of two orizontal bar magnets as sown below. Q N P S Compared to end Q, end P will ave A. fewer electrons. B. more electrons. C. fewer protons. D. more protons. 24. Te rms voltage of a sinusoidal electricity supply is 110 V. Te maximum potential difference during one cycle is A. 220 V. B. 156 V. C. 110 V. D. 55 V. Turn over
12 M12/4/PHYSI/HPM/ENG/TZ1/XX 25. All isotopes of uranium must ave te same A. cemical properties. B. mass. C. alf-life. D. decay constant. 26. A unit in wic mass defect can be measured is A. MeV. B. MeV c 1. C. MeV c 2. D. MeV per nucleon. 27. Wen compared wit beta particles and gamma-ray potons, alpa particles ave te greatest A. mass. B. penetrating power. C. range in air. D. speed. 28. Ligt of a particular wavelengt and intensity does not cause potoelectric emission from a clean metal surface in a vacuum. Wic of te following canges to te ligt migt cause potoelectric emission? A. Increase te intensity B. Decrease te intensity C. Increase te wavelengt D. Decrease te wavelengt
13 M12/4/PHYSI/HPM/ENG/TZ1/XX 29. Alpa particles of carge +2e and mass m are accelerated from rest troug a potential difference V. Planck s constant is. Wic of te following gives te de Broglie wavelengt of te alpa particles as a result of te acceleration? A. B. mv 4mVe C. 2mVe D. mv 30. Te lowest four energy levels of a particular atom are represented in te energy level diagram below. E E 3 E 2 E 1 E 0 Planck s constant is. Wat is te igest frequency in te atom s emission spectrum tat is associated wit tese levels? E3 A. E0 B. E E C. 3 0 E E D. 3 2 Turn over
14 M12/4/PHYSI/HPM/ENG/TZ1/XX 31. Wat is te momentum of an electron in te n=1 state of te one-dimensional electron in a box model? A. B. C. D. 2l l 2l l 32. Evidence for te existence of isotopes can come from analysis of A. te closest approac distance from carged particle scattering experiments. B. te discrete energies of alpa particles from a given nuclide. C. te range of energies of beta particles from a given nuclide. D. te pats taken by ions in a Bainbridge mass spectrometer. 19 33. Neon-19 ( Ne 10 ) undergoes β+ decay. Te oter two products of tis decay are A. B. C. D. 19 9 F and v. 19 11Na and v. 19 9F and v. 19 11Na and v. 34. Te fraction of te world s energy consumption provided by nuclear energy is A. less tan 0.2 %. B. between 0.2 % and 2 %. C. between 2 % and 20 %. D. greater tan 20 %.
15 M12/4/PHYSI/HPM/ENG/TZ1/XX 35. In a nuclear power station, in order to increase te cances of a cain reaction A. kinetic energy is removed from te neutrons. B. kinetic energy is given to te neutrons. C. some neutrons are absorbed. D. extra neutrons are added. 36. A natural process tat could cause an increase in global warming is A. an increase in te radius of te Eart s orbit around te Sun. B. an increase in te absorption of carbon dioxide by sea water. C. a drop in mean sea-level. D. deforestation as a result of natural ecosystem canges. 37. Wat is te unit for te coefficient of volume expansion? A. m 3 K 1 B. m 3 C. K D. K 1 38. Wat is te decimal equivalent to te binary number 10111? A. 4 B. 15 C. 23 D. 46 Turn over
16 M12/4/PHYSI/HPM/ENG/TZ1/XX 39. Capacitance is defined as A. B. C. D. current potential difference potential difference current carge potential difference potential difference carge 40. A digital camera is used to record star images. Wen focused on a small region of te nigt sky, one area of te image was blank. In order to record images of te faint stars tat do exist in tat region, a possible improvement would be to increase te A. magnification of te camera. B. total number of pixels. C. quantum efficiency of te pixels. D. resolution of te camera.