Introduction to Astronomy Exam Bank
Course Introduction
Introduction to Astronomy offers a comprehensive overview of the universe beyond our planet, exploring fundamental concepts such as the structure and scale of the cosmos, the life cycles of stars, planetary systems, galaxies, and cosmology. The course delves into the historical development of astronomical thought, the methods and tools astronomers use to observe celestial phenomena, and the role of physics in explaining celestial motions and structures. Students will gain an appreciation for the ongoing discoveries in astronomy and the ways these insights deepen our understanding of Earth's place in the universe.
Recommended Textbook
The Essential Cosmic Perspective 6th Edition by Jeffrey O. Bennett
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18 Chapters
2158 Verified Questions
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Page 2
Chapter 1: Our Place in the Universe
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Sample Questions
Q1) Which of the following statements does not use the term light-year in an appropriate way?
A) It's about 4 light-years from here to Alpha Centauri.
B) It will take me light-years to complete this homework assignment.
C) A light-year is about 10 trillion kilometers.
D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year.
E) The Milky Way Galaxy is about 100,000 light-years in diameter.
Answer: B
Q2) Which object has aged the most since it emitted the light we see today?
A) A star near the center of the Milky Way
B) A star in the Andromeda Galaxy
C) The Sun
D) Pluto
Answer: B
Q3) Consider the following statement, and explain whether or not it is sensible: Earth is always precisely 1 AU from the Sun.
Answer: Not sensible: One AU is the average distance between Earth and the Sun.
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Chapter 2: Discovering the Universe for Yourself
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Sample Questions
Q1) If the Moon is 3rd quarter phase, when does it rise?
A) Sunrise
B) Noon
C) Never
D) Sunset
E) Midnight
Answer: E
Q2) It's 6 a.m. and the Moon is at its highest point in your sky (crossing the meridian). What is the Moon's phase?
A) New
B) First quarter
C) Full
D) Third quarter
Answer: D
Q3) You observe a full moon rising at sunset. What will you see at midnight?
A) A full moon high in the sky
B) A first quarter moon
C) A waning gibbous moon
D) A third quarter moon
Answer: A
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Chapter 3: The Science of Astronomy
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Sample Questions
Q1) He was the first to prove that comets lie beyond Earth's atmosphere.
A) Tycho Brahe
B) Copernicus
C) Kepler
D) Galileo
E) Aristotle
Answer: A
Q2) Which of the following is not one of, nor a direct consequence of, Kepler's Laws?
A) The force of attraction between any two objects decreases with the square of the distance between their centers.
B) As a planet moves around its orbit, it sweeps out equal areas in equal times.
C) The orbit of each planet about the Sun is an ellipse with the Sun at one focus.
D) More distant planets orbit the Sun at slower speeds.
Answer: A
Q3) In the Ptolemaic system, Venus should not show phases.
A)True
B)False
Answer: False
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Chapter 4: Making Sense of the Universe: Understanding
Motion, Energy, and Gravity
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Sample Questions
Q1) The mass of Jupiter can be calculated by
A) measuring the orbital period and distance of Jupiter's orbit around the Sun.
B) measuring the orbital period and distance of one of Jupiter's moons.
C) measuring the orbital speed of one of Jupiter's moons.
D) knowing the Sun's mass and measuring how Jupiter's speed changes during its elliptical orbit around the Sun.
E) knowing the Sun's mass and measuring the average distance of Jupiter from the Sun.
Q2) As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases,
A) because gravitational potential energy is converted to thermal energy.
B) because kinetic energy is converted to radiative energy.
C) because thermal energy is converted to radiative energy.
Q3) The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that ________.
A) a force is acting on the planets
B) the planets are always accelerating
C) the planets have angular momentum
D) the planets will eventually fall into the Sun
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Page 6
Chapter 5: Light: the Cosmic Messenger
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Sample Questions
Q1) Which transition represents the electron that emits a photon with the highest energy?
Q2) Explain what an interferometer is and give an example.
Q3) What is an artificial star?
A) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations
B) a satellite orbiting Earth
C) a meteor
D) a possible source of dark matter in the universe
E) the unseen member of a binary star system
Q4) How does the light-collecting area of an 8-meter telescope compare to that of a 2-meter telescope?
A) The 8-meter telescope has 16 times the light-collecting area of the 2-meter telescope.
B) The 8-meter telescope has 4 times the light-collecting area of the 2-meter telescope.
C) The 8-meter telescope has 8 times the light-collecting area of the 2-meter telescope.
D) The answer cannot be determined from the information given in the question.
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Chapter 6: Formation of Planetary Systems: Our Solar
System and Beyond
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Sample Questions
Q1) Why did the solar nebula flatten into a disk?
A) The interstellar cloud from which the solar nebula formed was originally somewhat flat.
B) The force of gravity pulled the material downward into a flat disk.
C) As the nebula cooled, the gas and dust settled onto a disk.
D) It flattened as a natural consequence of collisions between particles in the nebula, changing random motions into more orderly ones.
Q2) Observations vs. Explanations. Which of the following statements is an explanation?
A) The farther a galaxy is, the faster it is moving away from us.
B) The inner planets of the solar system are rocky and the outer planets are gas giants.
C) The orderly orbits of planets arose from their formation in a rotating cloud of gas.
D) Hydrogen and helium are important constituents of stars.
E) All planets orbit the Sun in the same direction and nearly the same plane.
Q3) Pluto is the largest solar system object beyond the orbit of Neptune
A)True
B)False
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Chapter 7: Earth and the Terrestrial Worlds
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Sample Questions
Q1) What is a magnetosphere and how are magnetospheres related to planetary atmospheres?
Q2) Why is Venus so much hotter than Earth?
A) Venus rotates more slowly.
B) Venus has significant amounts of carbon dioxide in its atmosphere.
C) Venus is closer to the Sun.
D) Venus was formed before the Earth was.
E) Venus is more massive.
Q3) What do we mean by a runaway greenhouse effect?
A) A greenhouse effect that keeps getting stronger until all of a planet's greenhouse gases are in its atmosphere
B) A greenhouse effect that starts on a planet but later disappears as gases are lost to space
C) A greenhouse effect that heats a planet so much that its surface rock melts
D) A process that heats a planet like a greenhouse effect, but that involves a completely different mechanism of heating that doesn't actually involve greenhouse gases
Q4) Describe the three sources of internal heat of the terrestrial planets.
Q5) Summarize some of the evidence suggesting that Mars once had flowing water.
Q6) What is the "runaway greenhouse effect"?
Page 9
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Chapter 8: Jovian Planet Systems
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Sample Questions
Q1) Why does Jupiter have several distinct cloud layers?
A) Different layers represent clouds made of gases that condense at different temperatures.
B) Different layers represent the various regions where the temperature is cool enough for liquid water to condense.
C) Different gases are present at different altitudes in Jupiter's atmosphere.
D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes.
E) Clouds form randomly, so on average there are always several layers.
Q2) Which of the above applies to Triton?
A)the most volcanically active body in the solar system
B)thought to have a deep, subsurface ocean of liquid water
C)probably a captured Kuiper Belt object
D)the target of the Huygens probe, which landed on its surface.
E)the largest moon in the solar system
Q3) Overall, Jupiter's composition is most like that of ________.
A) the Sun
B) Earth
C) a comet
D) an asteroid
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Chapter 9: Asteroids, Comets, and Dwarf Planets: Their
Nature, Orbits, and Impacts
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Sample Questions
Q1) Kirkwood gaps in the asteroid belt occur at distances where
A) the density of asteroids is high enough for a large collision to pulverize a number of asteroids.
B) the period of an orbiting asteroid would be a simple fraction (like 1/3 or ¼) of Jupiter's orbital period.
C) the period of an orbiting asteroid would be the same as Jupiter's orbital period.
D) the period of an orbiting asteroid would be the same as Mars's orbital period.
E) the orbit would take the asteroid beyond the "frost line" in the solar system.
Q2) Why do asteroids and comets differ in composition?
A) Asteroids formed inside the frost line, while comets formed outside.
B) Asteroids and comets formed at different times.
C) Comets formed from the jovian nebula, while asteroids did not.
D) Comets are much larger than asteroids.
E) Asteroids are much larger than comets.
Q3) Pluto has 3 known moons.
A)True
B)False
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Page 11
Chapter 10: Our Star
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Sample Questions
Q1) From center outward, which of the following lists the "layers" of the Sun in the correct order?
A) Core, radiation zone, convection zone, photosphere, chromosphere, corona
B) Core, radiation zone, convection zone, corona, chromosphere, photosphere
C) Core, convection zone, radiation zone, corona, chromosphere, photosphere
D) Core, corona, radiation zone, convection zone, photosphere, chromosphere
Q2) The Sun's average surface (photosphere) temperature is about ________.
A) 5,800 K
B) 1,000,000 K
C) 1,000 K
D) 37,000 K
Q3) Energy from the core of the Sun first travels slowly through a convection zone and then much faster through the outer radiation zone.
A)True
B)False
Q4) The fundamental nuclear reaction occurring in the core of the Sun is ________.
A) nuclear fission
B) radioactive decay
C) nuclear fusion of hydrogen into helium
D) nuclear fusion of helium into carbon
Page 12
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Chapter 11: Surveying the Stars
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Sample Questions
Q1) 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
Q2) On the main sequence, stars obtain their energy
A) from chemical reactions.
B) from gravitational contraction.
C) by converting hydrogen to helium.
D) by converting helium to carbon, nitrogen, and oxygen.
E) from nuclear fission.
Q3) Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) The star is a member of a binary star system.
B) The star is of spectral type G.
C) The star is of spectral type A.
D) We know the star's luminosity and distance.
Q4) Which group represents hydrogen-burning stars with the shortest lifetimes?
Q5) Which group includes the Sun?
Page 13
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Chapter 12: Star Stuff
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Sample Questions
Q1) Which method of energy generation is used by the Sun today?
A)H fusion by the proton-proton chain
B)H fusion by the CNO cycle
C)helium fusion
D)matter-antimatter annihilation
E)gravitational contraction
Q2) The heaviest element produced by stars or in supernovae is silicon.
A)True
B)False
Q3) There is no limit to the mass with which a star can be born.
A)True
B)False
Q4) Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud.
A) thermal pressure
B) degeneracy pressure
C) radiation pressure
D) stellar winds
Q5) Briefly summarize the stages of life for a low-mass star.
Q6) Briefly describe how a star forms.
Page 14
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Chapter 13: Bizarre Stellar Graveyard
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Sample Questions
Q1) A typical white dwarf is ________.
A) as massive as the Sun but only about as large in size as Earth
B) as large in diameter as the Sun but only about as massive as Earth
C) about the same size and mass as the Sun but much hotter
D) as massive as the Sun but only about as large in size as Jupiter
Q2) You are studying a mystery companion to an evolved star, with mass transfer happening. Which of the following properties suggests that the companion is definitely a black hole?
A) The mystery companion has an X-ray emitting accretion disk.
B) The mystery companion has a mass of over 1.4 solar masses.
C) The mystery companion gives off periodic X-ray bursts.
D) The mystery companion has a mass of over 3 solar masses.
Q3) The maximum mass of a white dwarf is ________.
A) about the mass of our Sun
B) about 1.4 times the mass of our Sun
C) limitless; there is no theoretical limit to the maximum mass of a white dwarf
D) about 3 times the mass of our Sun
Q4) Briefly describe what you would see if your friend plunged into a black hole.
Q5) What is an X-ray burster? What causes the X-ray bursts?
Q6) Why do white-dwarf supernovae all have the same maximum luminosity?
Page 15
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Chapter 14: Our Galaxy
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Sample Questions
Q1) What evidence supports the existence of a black hole at the center of our galaxy?
A) We observe an extremely bright X-ray source at the center of our galaxy.
B) We can see gas falling into an accretion disk and past the event horizon of a black hole.
C) The motions of the gas and stars at the center indicate that it contains 4 million solar masses within a region only 3 light-years across.
D) We observe a large, dark object that absorbs all light at the center of our galaxy.
E) all of the above
Q2) The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s. Suppose you discover a star in the solar neighborhood that is moving relative to the Sun at a much higher speed, say 220 km/s. What kind of orbit does this star probably have around the Milky Way? In what part of the galaxy does it spend most of its time? Explain.
Q3) Briefly describe how we can use the orbital characteristics of stars at many distances from the galactic center to determine the distribution of mass in the Milky Way.
Q4) What produces the striking red, blue, and black colors of ionization nebulae?
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16
Chapter 15: Galaxies and the Foundation of Modern Cosmology
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Sample Questions
Q1) A quasar's spectrum is hugely redshifted. What does this large redshift tells us about the quasar?
A) The composition of the quasar
B) The distance to the quasar
C) The size of the quasar's central, supermassive black hole
D) The type of host galaxy in which the quasar resides
Q2) Quasars radiate most of their energy as radio emission.
A)True
B)False
Q3) In a photo like the Hubble Deep Field (Figure 15.1 in your textbook), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) The galaxies that are farthest away
B) The galaxies that have the most hot, young O and B stars
C) The galaxies that are the reddest in color
D) The galaxies that are nearest to us
Q4) How does a starburst end? What might happen to the galaxy afterwards?
Q5) Explain why galaxy-galaxy interactions are far more common than star-star interactions.
Q6) How are jets thought to be produced by active galaxies? Page 17
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Page 18
Chapter 16: Dark Matter, Dark Energy, and the Fate of the Universe
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Sample Questions
Q1) What fraction of the mass needed to halt expansion of the universe exists in the form of visible, luminous matter (such as the stars within galaxies)?
A) less than 1 percent
B) 10 percent
C) 25 percent
D) 50 percent
Q2) Your cell phone friend left your house and has been driving 60 miles per hour the whole time since then, and has gone 30 miles. How long has she been driving?
A) 60 minutes
B) 1800 minutes
C) ¹/ minute
D) 2 minutes
E) 30 minutes
Q3) When we say that a cluster of galaxies is acting as a gravitational lens, what do we mean?
A) It bends or distorts the light coming from galaxies located behind it.
B) It magnifies the effects of gravity that we see in the cluster.
C) It is an unusually large cluster that has a lot of gravity.
D) The overall shape of the cluster is that of a lens.
Page 19
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Chapter 17: The Beginning of Time
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Sample Questions
Q1) Helium originates from
A) stellar nucleosynthesis only.
B) the Big Bang only.
C) mostly from stellar nucleosynthesis with a small contribution from the Big Bang.
D) mostly from the Big Bang with a small contribution from stellar nucleosynthesis.
E) radioactive decay of elements heavier than carbon.
Q2) You are in a hot, dense place. You are surrounded by nuclear reactions that are rapidly fusing hydrogen into helium. You notice that your surroundings are cooling and rapidly dropping in density. Within about 5 minutes, the fusion reactions stop. Where are you?
A) You are in the center of a star very much like our Sun.
B) You are in the early universe during the era of nucleosynthesis.
C) You are inside a nuclear power plant on Earth.
D) You are in the center of a star much smaller than the Sun.
E) You are in the center of a massive star near the end of its life.
Q3) Briefly explain how Hubble's discovery of a relationship between galactic distance and redshift led to the idea of the Big Bang.
Q4) What is Olbers' paradox, and what is its resolution?
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Page 20
Chapter 18: Life in the Universe
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Sample Questions
Q1) In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico towards a globular cluster, 21,000 light-years away. Approximately how far has this message gotten as of today?
A) It's just beyond the Neptune in our solar system
B) It's just passing through the Oort cloud surrounding our solar system
C) It's just passing stars that are close neighbors to the Sun in the Milky Way
D) It's almost at the center of the Milky Way
E) It's already arrived at the globular cluster
Q2) Based on DNA studies, it seems that all life on Earth ________.
A) shares a common ancestor
B) belongs to one of just two kingdoms: plants and animals
C) arose from one of five distinct ancestors that lived about two billion years ago
D) requires oxygen to survive
Q3) The requirement of liquid water is the most severe constraint on the development of life.
A)True
B)False
Q4) What is the evidence that suggests planetary systems are common in the universe?
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Page 21