Antelope Valley College ASTR 101 Study Guide Exam 3

Transcription

1 Antelope Valley College ASTR 101 Study Guide Exam 3 The third exam will cover material in Chapters In addition to reading the chapters, reviewing notes, lecture slides, quizzes and homework assignments, you should emphasize in your study the following concepts covered in class Layers of the Sun; Solar Granulation; Sunspots and how they are formed Proton-proton fusion reactions; Temperature of the Sun s surface and core Parallax (know definition, equation, and limitations) Definitions of absolute visual magnitude, apparent visual magnitude, flux, and luminosity Spectral Classification Know by temperature and luminosity Stefan-Boltzmann Law (luminosity depends on what two factors?) All aspects of the H-R (see second page of the study guide) What is the main-sequence? What is a star s primary source of energy on the main sequence? What is hydrostatic equilibrium? What is the most common type of star? What can cause the collapse of an interstellar cloud to form new stars? What are the stages in the stellar birth process? What determines the time scale for these events? Brown Dwarfs What are they? What is the minimum mass to become a star and why? Alternative nuclear fusion in stars CNO cycle, Triple-alpha Process What is the life expectancy of our Sun? What % of a star s life is spent on the main sequence? What are hot Jupiters? Know the Doppler and transit technique for discovering extra solar planets. What is the sequence of evolutionary stages for a very low-mass star, Sun-like star and high mass star? What is the eventual fate of a very low-mass star, Sun-like star, and high mass star? Planetary Nebula (How are white dwarfs connected to this object?) White dwarfs How are large are they? What is the Chandrasekhar limit? Supernova Type I & II; Why do they occur? What is the Crab Nebula? Star clusters Globular & Open clusters (What are they? How do they differ?) What is the importance of studying star clusters? Anatomy of a black hole; Schwarzschild radius Maximum mass for a neutron star; What is the approximate size of a neutron star? Potential short answer questions 1. What are the required conditions to get proton-proton fusion started in a star? 2. Why are parallax measurements limited to the nearest stars? 3. Why is it incorrect to assume that the brightest star in an image is the closest star? 4. How are astronomers able to detect the presence of a black hole? 5. Explain the lighthouse model for neutron stars. 6. What is the minimum mass for a star? Why does this limit exist? 7. What is the turnoff point on the HR diagram and how can it be used to determine the age of a star cluster? 8. How do we know giant stars are larger than the sun? 9. Why do higher mass stars live shorter lives on the main sequence? 10. What are the two conditions required for a star to be on the main-sequence? 11. What is an extrasolar planet and why is direct detection of them so difficult? 12. Choose one indirect method of extrasolar planet detection. Name it and explain how it works

2 If a particular topic is not mentioned here do not assume it will not be on the test. It could be. The test is true/false (10 questions), multiple choice (20 questions), HR diagram exercise (10 questions) and some short answer (4). Bring a scantron and pencil.

3 Sample Questions for Exam 3 -- Chapters TRUE/FALSE. Mark 'A' if the statement is true and 'B if the statement is false. 1) All stars spend approximately the same amount of time on the main sequence. 2) The most massive stars generate energy at the end of their lives by fusing iron in their cores. 3) The more distant a star, the smaller its parallax. 4) In any star cluster, stars with lower masses greatly outnumber those with higher masses. 5) The temperature of the Sun's core is about 20,000 K. 6) Gravitational equilibrium means that the surface and the core of the Sun are at the same pressure. 7) Although the Sun does not generate energy by gravitational contraction today, this energy-generation mechanism was important when the Sun was forming. 8) Our Sun will end its life in a planetary nebula and become a white dwarf. 9) No visible light can escape a black hole, but things such as gamma rays, X-rays, and neutrinos can. 10) Most stars on the main sequence fuse hydrogen into helium in their cores, but some do not. 11) The maximum mass for a white dwarf is 1.4 solar masses. 12) Astronomers have discovered more extrasolar planets around other stars than the number of planets in our own Solar System. 13) The remnant left behind by a white-dwarf supernova is a neutron star. 14) Stars spend about 90% of their lifetime on the main sequence. 15) Blue stars are always more luminous than red stars. 16) There is no upper limit to the mass of a neutron star. 17) The apparent brightness of a star depends only on its luminosity. 18) Stars with high masses live longer than stars with lower masses. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 19) What do we mean when we say that the Sun is in gravitational equilibrium? A) The Sun always has the same amount of mass, creating the same gravitational force. B) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. C) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity. D) The Sun maintains a steady temperature. 1

4 20) Which of the following statements about open clusters is true? A) All stars in the cluster are approximately the same color. B) All stars in the cluster will evolve similarly. C) There is an approximately equal number of all types of stars in the cluster. D) All stars in the cluster are approximately the same age. E) All stars in the cluster have approximately the same mass. 21) You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is A) 0.1 parsec. B) 0.1 light-year. C) 10 light-years. D) 10 parsecs. E) impossible to determine. 22) A 10 solar mass main sequence star will produce which of the following remnants? A) black hole B) white dwarf C) neutron star D) none of the above 23) What happens to the core of a star after it ejects a planetary nebula? A) It becomes a white dwarf. B) It breaks apart in a violent explosion. C) It contracts from a protostar to a main-sequence star. D) It becomes a neutron star. E) None of the above 24) A star's luminosity is the A) lifetime of the star. B) surface temperature of the star. C) total amount of energy that the star radiates each second. D) total amount of energy that the star will radiate over its entire lifetime. E) apparent brightness of the star in our sky. 25) Compared to the star it evolved from, a red giant is A) cooler and dimmer. B) hotter and dimmer. C) cooler and brighter. D) the same temperature and brightness. E) hotter and brighter. 26) What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure? A) The star explodes violently, leaving nothing behind. B) The core contracts and becomes a black hole. C) Gravity is not able to overcome neutron degeneracy pressure. D) The core contracts and becomes a white dwarf. E) The core contracts and becomes a ball of neutrons. 2

5 27) In which wavelength region(s) would we need to carry out observations in order to study the accretion disk around a white dwarf in a binary system? A) visible light B) X-ray light C) ultraviolet light D) A and B E) B and C 28) What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star? A) the crowding of electrons in the core B) a critical fraction of the gas has been driven further into space C) the central object becoming hot enough to sustain nuclear fusion in its core D) nothing; all collapsing gas clouds become black holes 29) Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together? A) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain. B) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together. C) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together. D) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. 30) A star of spectral type G lives approximately how long on the main sequence? A) 10 billion years B) 1,000 years C) 1 billion years D) 10,000 years E) 10 million years 31) If the distance between us and a star is doubled, with everything else remaining the same, its luminosity A) remains the same, but its apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and its apparent brightness is decreased by a factor of two. C) remains the same, but its apparent brightness is decreased by a factor of two. D) is decreased by a factor of four, and its apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but its apparent brightness remains the same. 32) A white dwarf is A) the exposed core of a dead star, supported by neutron degeneracy pressure. B) the name for the singularity at the center of a black hole. C) a cool and very small main sequence star with a mass of less than 1.4 of a solar masses. D) the exposed core of a dead star, supported by electron degeneracy pressure. E) a hot but very small main sequence star with a mass of less than 1.4 solar masses. 3

6 33) Which of the following sequences correctly describes the stages of life for a low-mass star? A) red giant, protostar, main-sequence, white dwarf B) protostar, main-sequence, red giant, white dwarf C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, white dwarf, red giant E) protostar, red giant, main-sequence, white dwarf 34) On a Hertzsprung-Russell diagram, where on the main sequence would you find stars that have the greatest mass? A) upper right B) lower right C) upper left D) lower left 35) Observationally, how can we tell the difference between a white-dwarf supernova and a massive-star supernova? A) The light of a white-dwarf supernova fades steadily, while the light of a massive-star supernova continues to brighten for many weeks. B) A massive-star supernova is brighter than a white-dwarf supernova. C) The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not. D) A massive-star supernova happens only once, while a white-dwarf supernova can repeat periodically. E) We cannot yet tell the difference between a massive-star supernova and a white-dwarf supernova. 36) When does a star become a main-sequence star? A) when a star becomes luminous enough to emit thermal radiation B) when hydrogen fusion is occurring throughout the star's interior C) when the protostar assembles from its parent molecular cloud D) the instant when hydrogen fusion first begins in the star's core E) when the rate of hydrogen fusion in the star's core is high enough to sustain gravitational equilibrium 37) At the center of the Sun, nuclear fusion converts hydrogen into A) hydrogen compounds such as methane. B) radioactive elements such as uranium and plutonium. C) helium, gamma rays, and neutrinos. D) radiation and elements such as carbon and nitrogen. E) molecular hydrogen. 38) What is the ultimate fate of an isolated white dwarf? A) As gravity overwhelms the electron degeneracy pressure, it will explode as a nova. B) It will cool down and become a cold black dwarf. C) As gravity overwhelms the electron degeneracy pressure, it will become a neutron star. D) The electron degeneracy pressure slowly overwhelms gravity and the white dwarf evaporates. E) As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova. 39) What can trigger the gravitational collapse of an interstellar gas cloud? A) a decrease in temperature B) an increase in density C) a rise in temperature D) A and B E) A and C 4

7 40) Why do sunspots appear dark? A) They are regions that are significantly cooler than the rest of the photosphere. B) They are thick clouds on the sun, blocking its light. C) They are regions nearly devoid of gas. D) They are composed of different elements than the rest of the sun. 41) Which of the following is closest in size (radius) to a white dwarf? A) the Sun B) a basketball C) the Earth D) a football stadium E) a small city 42) What is the chief difficulty in attempting to detect planets around other stars? A) Even the largest planets are typically at least a factor of 10 times smaller than their host stars. B) Planets do not emit visible light. They are typically at least a billion times fainter than their host stars. C) Planets do not glow in the infrared, so infrared telescopes cannot be used to study them, either. D) A and B E) A, B, and C 43) Which of the following statements about globular clusters is true? A) There is an approximately equal number of all types of stars in the cluster. B) All stars in the cluster are approximately at the same stage in their evolution. C) All stars in the cluster have approximately the same mass. D) Most stars in the cluster are yellow or reddish in color. E) Most of the stars in the cluster are younger than 10 billion years. 44) What is a planetary nebula? A) what is left of its planets after a low-mass star has ended its life B) the molecular cloud from which protostars form C) a disk of gas surrounding a protostar that may form into planets D) the expanding shell of gas that is no longer gravitationally bound to the remnant of a low-mass star E) the expanding shell of gas that is left when a white dwarf explodes as a supernova 45) The Sun's surface seethes and churns with a bubbling pattern. Why? A) We are seeing hot gas rising and cool gas falling due to the convection that occurs beneath the surface. B) The Sun's surface is boiling. C) The churning is an illusion created by varying radiation, as the gas on the Sun's surface is actually quite still. D) The churning gas is being stirred up by the strong solar wind. 46) By what process does the Sun generate energy? A) nuclear fusion B) gradual expansion C) chemical reactions D) gravitational contraction E) nuclear fission 47) What percentage of a star's total lifetime is spent on the main sequence? A) 50% B) 100% C) 20% D) 90% E) 10% 5

8 48) What are the two primary methods by which planets have been found around other stars in our galaxy? I) Direct images in visible and infrared light II) Indirectly by detecting the motion of the host star III) Indirectly by measuring the drop in brightness of the host star when the planet crosses our line of sight A) I and III B) I and II C) II and III 49) If you were to come back to our Solar System in 6 billion years, what might you expect to find? A) a black hole B) a red giant star C) a rapidly spinning pulsar D) a white dwarf E) Everything will be essentially the same as it is now. 50) Which event marks the beginning of a supernova? A) the sudden outpouring of X-rays from a newly formed accretion disk B) the onset of helium burning after a helium flash in a star with mass comparable to that of the Sun C) the beginning of neon burning in an extremely massive star D) the expansion of a low-mass star into a red giant E) the sudden collapse of an iron core into a compact ball of neutrons 51) Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram? A) interior temperature on the horizontal axis and mass on the vertical axis B) surface temperature on the horizontal axis and luminosity on the vertical axis C) mass on the horizontal axis and stellar age on the vertical axis D) surface temperature on the horizontal axis and radius on the vertical axis E) mass on the horizontal axis and luminosity on the vertical axis 52) On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim? A) upper right B) lower right C) upper left D) lower left 53) What did Carl Sagan mean when he said that we are all "star stuff"? A) that life would be impossible without energy from the Sun B) that the Earth formed at the same time as the Sun C) that the universe contains billions of stars D) that the carbon, oxygen, and other elements essential to life were created by nucleosynthesis in stellar cores E) that the Sun formed from the interstellar medium: the "stuff" between the stars 54) Why do flat disks form around young stars? A) They don't; the stars form from the disks. B) Centrifugal force pushes gas outward from the spinning gas cloud. C) Collisions between rotating gas particles flatten the gas cloud along the axis of rotation. D) Intense winds from nearby massive stars flatten the gas cloud. 55) What types of stars end their lives with supernovae? A) stars that are similar in mass to the Sun B) stars that are at least several times the mass of the Sun C) stars that have reached an age of 10 billion years D) all stars that are red in color E) all stars that are yellow in color 6

9 56) What change slowly occurs during the main-sequence lifetime of a star? A) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. B) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity. 57) How does a black hole form from a massive star? A) If enough mass is accreted by a white dwarf star that it exceeds the 1.4 solar mass limit, it will undergo a supernova explosion and leave behind a black-hole remnant. B) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy pressure in the core, the core will collapse to a black hole. C) A black hole forms when two massive main-sequence stars collide. D) Any star that is more massive than 8 solar masses will undergo a supernova explosion and leave behind a black hole remnant. E) If enough mass is accreted by a neutron star, it will undergo a supernova explosion and leave behind a black-hole remnant. 58) Which of the following luminosity classes refers to stars on the main sequence? A) I B) II C) III D) IV E) V 59) Suppose you try to bring two protons close together. Because of the electromagnetic force, the two protons will A) attract one another. B) join together to form a deuterium nucleus. C) remain stationary. D) collide. E) repel one another. 60) Which of the following stars are brightest at ultraviolet wavelengths? A) M stars B) O and B stars C) G and K stars D) A and F stars E) None; all stars are brightest at optical wavelengths. 61) Sunspots are cooler than the surrounding gas in the photosphere because A) there is less fusion occurring there. B) strong magnetic fields slow convection and prevent hot plasma from entering the region. C) magnetic fields trap ionized gases that absorb light. D) they are regions where convection carries cooler material downward. E) magnetic fields lift material from the sunspot and quickly cool the material. 62) From a theoretical standpoint, what is a pulsar? A) a star that is burning iron in its core B) a star that alternately expands and contracts in size C) a rapidly rotating neutron star D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a neutron star or black hole that happens to be in a binary system 7

10 63) Why are many of the newly detected extrasolar planets called "hot Jupiters"? A) Their masses are similar to Jupiter but they are very close to the central star and therefore hot. B) Their masses and composition are similar to what we would expect if Jupiter were hotter. C) Their masses are similar to Jupiter but their composition is similar to Mercury. D) The planets tend to be detected around more massive, hotter stars than our Sun. E) because the discovery of other planets is very exciting 64) Which of the following is closest in size (radius) to a neutron star? A) the Earth B) a city C) a basketball D) the Sun E) a football stadium 65) What is the CNO cycle? A) the process by which helium is fused into carbon, nitrogen, and oxygen B) the process by which carbon is fused into nitrogen and oxygen C) the period of a massive star's life when carbon, nitrogen, and oxygen are fusing in different shells outside the core D) the period of a low-mass star's life when it can no longer fuse carbon, nitrogen, and oxygen in its core E) a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalysts 66) When is/was gravitational contraction an important energy generation mechanism for the Sun? A) It is the primary energy generation mechanism in the Sun today. B) It is important during periods when the Sun is going from solar maximum to solar minimum. C) It has played a role throughout the Sun's history, but it was most important right after nuclear fusion began in the Sun's core. D) It was important when the Sun was forming from a shrinking interstellar cloud of gas. 67) Why does stellar main-sequence lifetime decrease with increasing stellar mass? A) It doesn't; higher mass stars have more hydrogen available for fusion, and thus have longer lifetimes. B) Higher core temperatures cause fusion to proceed much more rapidly. C) Higher outward pressure prevents the core hydrogen from being replenished by the star's outer layers. D) Strong stellar winds cause higher mass stars to lose mass quickly. 68) What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores? A) fusion in their low-density outer layers B) energy released by infalling matter C) fission from concentrated radioactive elements D) light absorbed from nearby stars 69) What kind of pressure supports a white dwarf? A) neutron degeneracy pressure B) thermal pressure C) radiation pressure D) electron degeneracy pressure E) all of the above 70) Which of the following is closest in mass to a white dwarf? A) the Sun B) the Earth C) Jupiter D) the Moon 8

11 71) After a massive-star supernova, what is left behind? A) always a black hole B) always a neutron star C) always a white dwarf D) either a white dwarf or a neutron star E) either a neutron star or a black hole 72) Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ? A) color they are formed with B) luminosity they are formed with C) mass they are formed with D) time they are formed E) location where they are formed 73) Which of the following statements about black holes is not true? A) The event horizon of a black hole represents a boundary from which nothing can escape. B) If the Sun magically disappeared and was replaced by a black hole of the same mass, the Earth would soon be sucked into the black hole. C) If you fell into a supermassive black hole (so that you could survive the tidal forces), you would experience time to be running normally as you plunged across the event horizon. D) If you watch someone else fall into a black hole, you will never see him or her cross the event horizon. However, he or she will fade from view as the light he or she emits becomes more and more redshifted. E) If we watch a clock fall toward a black hole, we will see it tick slower and slower as it falls towards the black hole. 74) On a Hertzsprung-Russell diagram, where would you find stars that have the largest radii? A) upper right B) lower right C) upper left D) lower left 75) Which of the following methods has led to the most discoveries of extrasolar planet candidates? A) detecting a planet ejected from a binary star system B) detecting the shift of the star's position against the sky due to the planet's gravitational pull C) detecting the infrared light emitted by the planet D) detecting the gravitational effect of an orbiting planet by looking for the Doppler shifts in the star's spectrum E) detecting the dip in measured brightness as the planet crosses our line of sight to the star 76) Why does a star grow larger after it exhausts its core hydrogen? A) The internal radiation generated by the hydrogen fusion in the core has heated the outer layers enough that they can expand after the star is no longer fusing hydrogen. B) The outer layers of the star are no longer gravitationally attracted to the core. C) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward. D) Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward. E) Helium fusion in the core generates enough thermal pressure to push the upper layers outward. 77) Helium fusion results in the production of A) iron. B) oxygen. C) hydrogen. D) carbon. E) nitrogen. 9

12 78) Which of the following terms is given to a pair of stars that appear to change position in the sky, indicating that they are orbiting one another? A) spectroscopic binary B) visual binary C) eclipsing binary D) double star E) none of the above 79) Why do sunspots appear dark in pictures of the Sun? A) They are extremely hot and emit all their radiation as X-rays rather than visible light. B) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. C) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. D) They are too cold to emit any visible light. 80) The stellar spectral sequence, in order of decreasing temperature, is A) ABFGKMO. B) OBAFGKM. C) OBAGFKM. D) BAGFKMO. E) OFBAGKM. 81) What happens when a star like the sun exhausts its core hydrogen supply? A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It expands, becoming bigger but dimmer. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It contracts, becoming hotter and brighter. 82) Which two energy sources can help a star maintain its internal thermal pressure? A) nuclear fusion and nuclear fission B) nuclear fission and gravitational contraction C) chemical reactions and gravitational contraction D) nuclear fusion and gravitational contraction E) nuclear fusion and chemical reactions 83) The core of the Sun is A) composed of iron. B) much hotter and much denser than its surface. C) constantly rising to the surface through convection. D) at the same temperature and density as its surface. E) at the same temperature but much denser than its surface. 84) From an observational standpoint, what is a pulsar? A) a star that slowly changes its brightness, getting dimmer and then brighter, with a period of anywhere from a few hours to a few weeks B) a star that changes color rapidly, from blue to red and back again C) an object that emits random "pulses" of light, sometimes with only a fraction of a second between pulses and other times with several days between pulses D) an object that emits flashes of light several times per second (or even faster), with near perfect regularity 10

13 85) The age of stars in a cluster can be determined by A) counting the number of stars in each spectral class. B) finding spectroscopic binaries in the cluster. C) finding pulsating variable stars in the cluster. D) determining the main sequence turnoff point. E) fitting the position of the main sequence to the Sun. 86) After a supernova event occurring in a high-mass star, what is left behind? A) always a neutron star B) always a black hole C) always a white dwarf D) either a white dwarf or a neutron star E) either a neutron star or a black hole 87) Compared to the star it evolved from, a white dwarf is A) cooler and dimmer. B) cooler and brighter. C) hotter and brighter. D) the same temperature and brightness. E) hotter and dimmer. 88) How do we know that pulsars must be neutron stars? A) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. B) Telescopic images of pulsars and neutron stars look exactly the same. C) This is only a theory that has not yet been confirmed by observations. D) We have observed massive-star supernovae produce pulsars. E) Pulsars have the same upper mass limit as neutron stars do. 89) What kind of star is most likely to become a white-dwarf supernova? A) a star like our Sun B) a white dwarf star with a red giant binary companion C) a pulsar D) an O star E) a binary M star 90) On a Hertzsprung-Russell diagram, where would you find stars that are cool and luminous? A) upper right B) lower right C) upper left D) lower left 91) On the main sequence, stars obtain their energy A) by converting helium to carbon, nitrogen, and oxygen. B) by converting hydrogen to helium. C) from gravitational contraction. D) from chemical reactions. E) from nuclear fission. 11

14 92) What causes the radio pulses of a pulsar? A) A black hole near the neutron star absorbs energy and re-emits it as radio waves. B) The neutron star's orbiting companion periodically eclipses the radio waves that the neutron star emits. C) The neutron star undergoes periodic explosions of nuclear fusion that generate radio pulses. D) The vibration of the neutron star E) As the neutron star spins, beams of radio radiation sweep through space. If one of the beams crosses the Earth, we observe a pulse. 93) The spectral sequence sorts stars according to A) core temperature. B) radius. C) mass. D) luminosity. E) surface temperature. 12

15 Answer Key Testname: SAMPLEE3 1) FALSE 2) FALSE 3) TRUE 4) TRUE 5) FALSE 6) FALSE 7) TRUE 8) TRUE 9) FALSE 10) FALSE 11) TRUE 12) TRUE 13) FALSE 14) TRUE 15) FALSE 16) FALSE 17) FALSE 18) FALSE 19) C 20) D 21) D 22) C 23) A 24) C 25) C 26) B 27) E 28) C 29) D 30) A 31) A 32) D 33) B 34) C 35) C 36) E 37) C 38) B 39) D 40) A 41) C 42) D 43) D 44) D 45) A 46) A 47) D 48) C 49) D 50) E 13

16 Answer Key Testname: SAMPLEE3 51) B 52) B 53) D 54) C 55) B 56) C 57) B 58) E 59) E 60) B 61) B 62) C 63) A 64) B 65) E 66) D 67) B 68) B 69) D 70) A 71) E 72) C 73) B 74) A 75) E 76) C 77) D 78) B 79) B 80) B 81) A 82) D 83) B 84) D 85) D 86) E 87) E 88) A 89) B 90) A 91) B 92) E 93) E 14