General Astronomy Test Bank
Course
Introduction
General Astronomy provides an introduction to the fundamental concepts and discoveries of astronomy, exploring the structure and evolution of the universe, stars, planetary systems, and galaxies. The course covers key topics such as celestial motion, the solar system, light and telescopes, stellar birth and death, black holes, cosmology, and the search for extraterrestrial life. Through lectures, observational activities, and discussions, students gain a deeper understanding of how astronomers study the universe and the processes shaping celestial phenomena.
Recommended Textbook Astronomy Preliminary Edition by Adam Frank
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18 Chapters
1261 Verified Questions
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2
Chapter 1: Getting Started: Science, astronomy, and Being Human
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Sample Questions
Q1) Suppose that an ant colony has 3 million ants.Each has a mass of fifteen-hundredths of a gram.What is the total mass of the entire colony of ants?
A) 4.5 × 10<sup>3</sup>
B) 4.5 × 10<sup>4</sup>
C) 4.5 × 10<sup>5</sup>
D) 4.5 × 10<sup>6</sup>
Answer: C
Q2) Express 0.0003 in standard scientific notation.
A) 3.0 × 10 <sup>-4</sup>
B) 3.0 × 10 <sup>-3</sup>
C) 3.0 × 10<sup>4</sup>
D) 3.0 × 10<sup>3</sup>
Answer: A
Q3) How many orders of magnitude are there between the size of a proton and the diameter of a star?
Answer: 24.
Q4) Identify the base,coefficient,and exponent in the number 4.07 × 10 .
Answer: The base is 10,the coefficient is 4.07,and the exponent is 6.
Page 3
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Chapter 2: A Universe Made, a Universe Discovered
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Sample Questions
Q1) Which of the following phases of the Moon occurs when Earth is between the Sun and the Moon?
A) new
B) third quarter
C) full
D) first quarter
Answer: C
Q2) An observer on the dwarf planet Pluto sees the Sun pass through a different set of constellations than an observer on Earth over the course of one orbit.Which of the following best explains this?
A) Pluto is farther from the Sun.
B) Pluto has a longer orbital period than Earth.
C) Pluto's orbit is tilted with respect to Earth's orbit.
D) Pluto has a longer rotation period than Earth.
Answer: C
Q3) Describe the nightly motion of a circumpolar star.
Answer: A circumpolar star rotates around the celestial pole without rising or setting; it is visible throughout the night.
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4
Chapter 3: A Universe of Universal Laws
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Sample Questions
Q1) Had it been observed in the 16th century,which of the following astronomical sources might have challenged Aristotelian physics for the same reasons that Tycho's supernova did?
A) interstellar dust
B) comets
C) a bright source appearing in the sky for only a single night
D) atmospheric seeing
Answer: C
Q2) The acceleration experienced by Earth due to the Moon's gravity is ________ the acceleration experienced by the Moon due to Earth's gravity.(Note that the Moon is about 1% of the mass of Earth.)
A) 10<sup>-4</sup> times
B) 10<sup>-2</sup> times
C) equal to
D) 10<sup>4</sup>
Answer: B
Q3) Why did Copernicus's model set the scale of the solar system?
Answer: The timing of retrograde motion set the speeds and radii of the planetary orbits.
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5
Chapter 4: A Universe of Universal Laws
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Sample Questions
Q1) The speed of a light wave:
A) increases with its frequency.
B) increases with its wavelength.
C) decreases with its amplitude.
D) is independent of its other properties.
Q2) What property of a star allows you to measure its composition?
A) the brightest color in its spectrum
B) the wavelengths of its absorption lines
C) its luminosity
D) its mass
Q3) The practice of combining signals from two or more reflectors to achieve better angular resolution is:
A) adaptive optics.
B) interferometry.
C) refraction.
D) signal processing.
Q4) The next generation of large near-infrared telescopes will be built at high,dry sites.List two reasons why.
Q5) What does thermal energy represent?
Q6) Which portions of the electromagnetic spectrum must be observed from space?
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Chapter 5: The Architecture and Birth of Planetary Systems
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Sample Questions
Q1) The theory that describes the formation of planetary systems is the:
A) condensation theory.
B) core accretion model.
C) disk theory.
D) protoplanetary theory.
Q2) Arrange the following objects in order of increasing distance from the Sun:
A) Earth, asteroid belt, Jupiter, Kuiper Belt, scattered disk, Oort Cloud.
B) Earth, Jupiter, asteroid belt, scattered disk, Kuiper Belt, Oort Cloud.
C) asteroid belt, Earth, Oort Cloud, Jupiter, Kuiper Belt, scattered disk.
D) scattered disk, Earth, asteroid belt, Oort Cloud, Jupiter, Kuiper Belt.
Q3) The first extrasolar planets were discovered in:
A) 1601.
B) 1951.
C) 1995.
D) 2011.
Q4) How would the outer parts of our Solar System be different if the gaseous portion of the protoplanetary disk remained for longer?
Q5) Why do the compositions of planets in our Solar System depend on distance from the Sun?
Q6) What is a dwarf planet?
Page 7
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Chapter 6: Home Base: Earth and Moon
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Q1) Which of the following is NOT a common result of the collision of two plates?
A) earthquakes
B) volcanoes
C) mid-ocean ridges
D) mountain ranges
Q2) What does the lack of a large-scale lunar magnetic field imply about the Moon's interior?
Q3) Why did Earth lose its primary atmosphere?
Q4) Which of the following is important for the greenhouse effect on Earth?
A) carbon dioxide
B) methane
C) water vapor
D) all of the above
Q5) A long line of active volcanoes often marks:
A) a plume.
B) an area of increased radioactivity.
C) a weak point in the crust.
D) the boundary of two plates.
Q6) What can you conclude about a large region of the Moon's surface with relatively few craters?
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Chapter 7: Sibling Worlds: Mercury, Venus, and Mars
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Sample Questions
Q1) Planetary scientists have had difficulty understanding Venus's internal structure because it:
A) has not been geologically active.
B) rotates slowly.
C) has no moons.
D) has no cratering.
Q2) What is the correct ordering of the periods in Mars's history,from earliest to latest?
A) Noachian, Amazonian, Hesperian
B) Hesperian, Amazonian, Noachian
C) Hesperian, Noachian, Amazonian
D) Noachian, Hesperian, Amazonian
Q3) Most likely,Venus's magnetic field is weak because it:
A) lacks a liquid metal core.
B) is deficient in iron.
C) rotates slowly.
D) is too close to the Sun's magnetic field.
Q4) What is responsible for heating Venus's atmosphere to 730 K?
Q5) How do astronomers use guiding principles to supplement the scientific method?
Q6) Name two ways in which Phobos and Deimos differ from Earth's Moon.
Page 9
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Chapter 8: Gas, ice, and Stone: the Outer Planets
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Sample Questions
Q1) How does the atmosphere of Titan compare to Earth's?
Q2) Compared to Jupiter,Saturn has ________ powerful storms and ________ winds. A) more; slower
B) more; faster
C) fewer; slower
D) fewer; faster
Q3) An exoplanet with a spin axis similar to Uranus's transits its star.If the exoplanet had large planetary rings,astronomers who measured the transit's depth might:
A) overestimate the planet's radius.
B) overestimate the planet's orbital semimajor axis.
C) underestimate the planet's mass.
D) underestimate the planet's orbital semimajor axis.
Q4) Why does a moon in a 2:1 orbital resonance with a planetary ring have such strong influence on it?
Q5) What is responsible for the coloration of Jupiter's clouds?
Q6) Some scientists believe that helium is precipitating as "rain" in the interior of Saturn.How does this affect Saturn's energy balance with the Sun?
Q7) How was the mass of Neptune predicted before it was observed?
Page 10
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Chapter 9: Life and the Search for Habitable Worlds
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Q1) What is sensitivity in the context of the definition of life?
Q2) What is the most common method by which microorganisms acquire their genes?
Q3) Eukaryotic organisms became dominant after:
A) the Great Oxygenation Event.
B) the Cambrian explosion.
C) photosynthesis began.
D) the extinction of the dinosaurs.
Q4) Which of the following is a function of proteins inside cells?
A) structural components
B) enzymes
C) signalers
D) all of the above
Q5) At present,conclusions about extraterrestrial life are based on:
A) lunar geology.
B) the chemistry of complex organic molecules in the interstellar medium.
C) the study of life on Earth.
D) telescopic signatures of life on exoplanets.
Q6) How is information from an organism's genes used to construct enzymes for use in a cell?
Q7) What is the most important process in driving evolutionary adaptation?
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Chapter 10: The Sun As a Star
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Sample Questions
Q1) What are the two properties that define a star?
Q2) Why does fusion occur only at the center of the Sun?
Q3) The most direct measurement of the fusion reactions within the Sun comes from:
A) neutrinos.
B) its spectrum.
C) its luminosity.
D) helioseismology.
Q4) The net result of the proton-proton chain in the Sun is to convert:
A) four protons to one helium-4 nucleus, one neutrino, one positron, and gamma rays.
B) four protons to one helium-4 nucleus, two neutrinos, two positrons, and gamma rays.
C) two protons to one helium-4 nucleus, one neutrino, one positron, and gamma rays.
D) six protons to one helium-4 nucleus, two neutrinos, two neutrons, and gamma rays.
Q5) Name three aspects of sunspots that depend strongly on the solar magnetic cycle.
Q6) Before 2002,why did astronomers detect only a fraction of the neutrinos they expected from the Sun?
Q7) How does the Sun's rotation differ from Earth's?
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Page 12
Chapter 11: Measuring the Stars: the Main Sequence and Its Meaning
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Sample Questions
Q1) Why are stars considered to be thermodynamic systems?
A) Stars are hot.
B) Stars are always in motion.
C) Stars are giant collections of atoms.
D) Stars are powered by combustion.
Q2) Draw an HR diagram and sketch the location of the main sequence,red giant branch,and white dwarfs.
Q3) Why are globular clusters useful for studies of stellar evolution?
A) Their stars span a wide range of masses.
B) Their stars are the same age.
C) Their stars all have the same composition.
D) All of the above.
Q4) What causes a star to leave the main sequence?
A) the decreasing temperature of the star
B) the decreasing temperature of the star's core
C) the consumption of all the star's hydrogen
D) the consumption of the stellar core's hydrogen
Q5) How does the inclination of a spectroscopic binary star system's orbit affect astronomers' mass estimates of the stars?
Page 13
Q6) What is an astrometric binary?
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Page 14
Chapter 12: Nursery of the Stars: the Interstellar Medium and Star Formation
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Sample Questions
Q1) Name two sources for the energy radiated by brown dwarfs.
Q2) Which of the following provides the best example of turbulence?
A) a molecular cloud with large whorls containing many smaller whorls
B) a jet launched at near the speed of light by a supermassive black hole
C) a large network of convection cells inside a star
D) an accretion disk rotating around a black hole
Q3) What is the criterion for a collapsing cloud to become a protostar?
Q4) How can astronomers observe coronal gas in the interstellar medium?
Q5) Which part of the interstellar medium is primarily photoionized?
A) molecular clouds
B) H I clouds
C) warm interstellar medium
D) coronal gas
Q6) How do dust particles affect the formation of interstellar molecules?
A) Dust particles collide and break into smaller molecules.
B) Dust particles are the building blocks of molecules.
C) Dust particles trap other atoms, which can form molecules.
Page 15
D) Radiation from dust particles catalyzes dust formation.
Q7) Why does the initial mass function of stars differ from the actual distribution of stars in the Milky Way at the present day?
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Page 16
Chapter 13: To the Graveyard of Stars: the End Points of Stellar Evolution
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Sample Questions
Q1) Why does stellar fusion end with an iron core?
A) The core becomes so hot it expands too much.
B) Iron cannot undergo fusion.
C) Iron does not produce energy when it undergoes fusion.
D) Iron requires such a high temperature for fusion that it does not occur inside stars.
Q2) Why do asymptotic giant branch stars have powerful winds?
A) Dust forming in the star's envelope is opaque to its radiation.
B) Mass is lost during each of the star's pulsations.
C) The loss of fusion energy in the star's core means that the outer layers are no longer gravitationally bound.
D) The outer layers become too hot to be gravitationally bound.
Q3) Suppose that a white dwarf accretes mass.How does its radius change?
Q4) Why can massive stars fuse heavier elements than less massive stars?
Q5) Why does the duration over which a massive star fuses elements decrease from hydrogen to iron?
A) The core temperature increases.
B) The star produces less energy per fusion reaction.
C) The core density increases.
D) all of the above
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Chapter 14: Down the Rabbit Hole: Relativity and Black Holes
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Sample Questions
Q1) Where do supermassive black holes typically live?
Q2) Why does the existence of a singularity at the center of a black hole challenge the general theory of relativity?
Q3) An accretion disk around a black hole is threaded by magnetic fields.What is a likely result of this configuration?
A) a jet of material moving near the speed of light
B) the breakup of the accretion disk
C) a reversal in the orbits of material in the accretion disk
D) bright optical emission from the accretion disk
Q4) Most astronomers believe that stars that end their lives as black holes do not usually produce strong supernova explosions,unlike those that produce neutron stars.Why?
Q5) From the perspective of an observer near a black hole,which of the following appears to happen as he or she observes large distances from the black hole?
A) Distant objects appear to move toward the black hole.
B) Distant objects appear redder than they should.
C) Distant clocks tick more rapidly than the observer's clock.
D) Distant objects appear to "freeze" in time.
Page 18
Q6) What kind of objects exhibit the strongest frame-dragging effects?
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Chapter
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Q1) Which of the four fundamental forces of nature could dark matter experience?
A) gravity and the weak nuclear force
B) gravity, the strong nuclear force, and the weak nuclear force
C) gravity and the strong nuclear force
D) gravity only
Q2) Why does the Milky Way's dark matter have a roughly spherical distribution?
A) Dark matter does not collide with other particles.
B) There is more dark matter than normal matter in the Milky Way.
C) Dark matter particles do not orbit the Milky Way's center.
D) The disk is younger than the dark matter halo.
Q3) How did Harlow Shapley avoid the bias of dust when measuring the size and shape of the Milky Way?
A) by observing in the infrared
B) by observing in the radio
C) with star counts
D) using globular clusters
Q4) How does the fraction of heavy elements inside gas clouds vary with location in the Milky Way's disk?
Q5) How do the orbits of globular clusters differ from those of stars in the Milky Way's disk?
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Chapter 16: A Universe of Galaxies
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Sample Questions
Q1) Edwin Hubble classified elliptical galaxies according to their:
A) size.
B) color.
C) apparent shape.
D) velocities.
Q2) Two elliptical galaxies have identical radii and luminosities,but stars in galaxy A have a maximum orbital speed three times that of galaxy B.How much more massive is galaxy A than galaxy B?
A) nine times more
B) three times more
C) 1.7 times more
D) 1.3 times more
Q3) A low-mass galaxy is situated 10 kiloparsecs from a flocculent spiral galaxy.Which of the following is most likely to describe the low-mass galaxy?
A) irregular
B) spiral
C) barred spiral
D) elliptical
Q4) Why are the bars in barred spiral galaxies typically bright?
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Chapter 17: The Cosmic Web: the Large-Scale Structure of the Universe
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Q1) Why are most galaxies inside clusters ellipticals or lenticular galaxies?
Q2) The high temperature and pressure of gas in the intracluster medium of galaxy clusters implies that:
A) clusters are in the midst of expanding.
B) clusters host powerful active galactic nuclei.
C) many of the cluster galaxies are obscured by absorption from the intracluster medium.
D) clusters are dominated by dark matter.
Q3) An astronomer observes 1,000 galaxies positioned within 5 Mpc of each other in a galaxy cluster.What other quantity or quantities should he or she measure to determine the mass of this cluster?
Q4) Two galaxy clusters have identical radii,but the galaxies in cluster A have a typical orbital velocity of 700 km/s,while the galaxies in cluster B have a typical velocity of 1,400 km/s.How do the masses of these clusters compare to each other?
A) Cluster B is half as massive as cluster A.
B) Cluster B is twice as massive as cluster A.
C) Cluster B is four times as massive as cluster A.
D) Cluster B is eight times as massive as cluster A.
Q5) In what sense is the Universe homogeneous?
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Chapter 18: Cosmology
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Q1) A photon is produced 300,000 years after the Big Bang,eventually reaching a telescope on Earth.How did it travel to get there?
A) It traveled in a straight line.
B) It scattered off matter until it hit the telescope.
C) It traveled in a straight line for 100,000 years and then scattered off matter until it hit the telescope.
D) It scattered off matter for 100,000 years and then traveled in a straight line.
Q2) What is the total density parameter of our Universe?
A) W = 0.1
B) W = 0.3
C) W = 1
D) W = 2
Q3) To what accuracy are the relative densities of dark energy and dark matter known,according to current cosmological measurements?
A) to 1 part in 10,000
B) to 1 part in 100
C) within a factor of 2
D) to an order of magnitude
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