Quiz
Astronomy 104 Exam #2
Questions in this quiz (30)
1What advantage do you gain by having two eyes that are separated on your face, rather than being very close together?
- ABetter collecting area, which allows you to see dimmer objects
- BDouble vision, which allows you to see multiple objects at once
- CColor vision, which allows you to determine temperatures
- DStereoscopic vision, which allows you to determine distances
- EBetter magnification, which allows you to see smaller objects
2To measure the parallax of the most distant stars measurable, we would make two measurements of the star's position on the sky separated by:
- A6 hours
- B12 hours
- C24 hours
- D6 months
- E2 months
3Stars A and B appear equally bright, but star A is twice as far away from us as star B. Which of the following is true?
- AStar A is twice as luminous as star B
- BStar A is four times as luminous as star B
- CStar B is four times as luminous as star B
- DStar B is twice as luminous as star A
- EStar A and star B have the same luminosity because they have the same brightness
4Which sequence correctly lists the spectral classes of stars in order from hottest to coolest?
- AABFGKMO
- BOABGFMK
- CEIEIO
- DOBAFGKM
- EMKGFABO
5The faster-moving star in a binary is:
- AThe less massive star
- BThe more massive star
- CThe smaller radius star
- DThe larger radius star
- EThe lower temperature star
6On a typical H-R diagram, where are the stars with the largest radii located?
- AIn the upper left corner
- Bin the upper right corner
- CIn the center
- DIn the lower left corner
- EIn the lower right corner
7The one property of a main-sequence star that determines all its other properties is its:
- ALuminosity
- BMass
- CTemperature
- DSpectral Type
- EBrightness
8Hydrostatic equilibrium is a balance between:
- AHeat and centrifugal force
- BCore temperature and surface temperature
- CPressure and gravity
- DRadiation and heat
- ECentrifugal force and gravity
9The majority of the Sun's energy come from:
- AGravitational contraction
- BNuclear fission of uranium
- CHydrogen fusion
- DHelium burning
- EBurning material as in a fire
10If the core of the Sun were hotter than it is now, how would the Sun's energy production change?
- AIt would produce less energy per second then it does now
- BIt would produce more energy per second than it does now
- CIts energy production would vary more than it does now
- DIts energy production would be more stable than it is now
- EThe Sun's energy production would not change
11What do astronomers mean when they say that the Sun makes energy by hydrogen burning?
- AThe Sun is combusting hydrogen in a fire and releasing energy
- BThe Sun is fusing hydrogen into uranium and releasing energy
- CThe Sun is made of mostly hydrogen at very high temperature
- DThe Sun is fusing hydrogen into helium and releasing energy
- EThe Sun is accumulating hydrogen from the solar wind and releasing energy
12Which of these can travel directly from the center of the Sun to Earth in about 8 minutes?
- APhotons
- BElectrons
- CProtons
- DNeutons
- ENeutinos
13The magnetic field of the Sun is continuously produced and deformed by:
- AIts differential rotation
- BThe solar wind
- CChanges in the rate of nuclear fusion in the core
- DLiquid conducting layer in the interior
- EThis is a trick question, the solar magnetic field is primordial
14If you could watch stars forming out of a gas cloud, which stars would form first?
- ALow-mass stars
- BMedium-mass stars
- CHigh-mass stars
- DThe ones with most natural talents
- EStars with more heavy elements
15Warm ionized gas in the interstellar medium appear _____ when imaged in the optical region of the electromagnetic spectrum.
- ARed
- BYellow
- CWhite
- DBlue
- EDark
1621-cm radiation is important because:
- AIt allows us to study the deep interiors of stars
- BIt allows us to image magnetic fields directly
- CIt allows us to study neutral hydrogen in the interstellar medium
- DIt is produced by every object in the universe
- EIt is the longest wavelength of light that can naturally be produced
17An accretion disk forms around a collapsing protostar because infalling material must conserve:
- AEnergy
- BCentrifugal force
- CGravity
- DVelocity
- EAngular Momentum
18The source of energy for a contracting protostar comes from:
- AThermonuclear energy
- BKinetic energy
- CChemical Energy
- DGravitational potential energy
- ERadiation energy
19Of the following processes at work in molecular clouds, which is the one that inevitably dominates the clouds's evolution?
- AMagnetic fields
- BConservation of angular momentum
- CPressure
- DGravity
- ETurbulence
20What critical event transforms a protostar into a normal main-sequence star?
- APlanets in the accretion disk
- BThe star grows suddenly larger in radius
- CTriple alpha reactions begin in the core
- DNuclear fusion begins in the core
- EConvection begins throughout the star's interior
21A nova is the result of which explosive situation?
- AMass transfer onto a white dwarf
- BHelium burning in a degenerate stellar core
- CA white dwarf which exceeds the Chandrasekhar limit
- DThe collision of members of a binary system
- ERunaway nuclear reactions in the core
22The principal means by which high-mass stars generate energy on the main sequence is called:
- AThe proton-proton chain
- BThe carbon-carbon reaction
- CThe triple-alpha process
- DThe CNO Cycle
- ENeutrino cooling
23Massive stars synthesize chemical elements going from helium up to iron:
- AThroughout the interior
- BPrimarily at the surface
- COnly in the core of the star
- DAlong the equator of the star
- EIn a deep convection zone in the interior of the star
24What causes massive stars to expel their outer layers?
- ARadiation pressure
- BHigh magnetic fields
- CRapid rotation
- DCarbon fusion
- EEmission of neutrinos
25During the main-sequence evolution of a massive star, increasingly heavier elements are fused in the core, giving the core support for:
- ALonger and longer times
- BShorter and shorter times
- CAn approximately equal amount of time
- DApproximately 10,000 years
- EOnly a few days
26The Crab Nebula is an important test of our ideas about supernova explosions because:
- APeople saw the supernova and later astronomers found a pulsar inside the nebula
- BThe system contains X-Ray binary
- CThe nebula is expanding slowly, as expected from mass loss rates in massive stars
- DCrabs must have evolved before humans
- EAstronomers observed the merger of the two stars
27Which of these begins first in the core of a massive star?
- ASilicon fusion to iron
- BNeon fusion to magnesium
- CCarbon fusion to neon
- DHelium fusion to carbon
- EHydrogen fusion to helium
28Where did all heavy elements in the Sun come from?
- APrevious generation of stars seeded the interstellar medium out of the Sun formed
- BNearby supernova explosions directly contaminated the Sun's surface
- CNucleosynthesis within the Sun generated all the elements we see in the solar spectrum
- DThe Sun gobbled up some planets during the early days of our Solar System
- EThe solar wind carries away hydrogen and helium, leaving behind the heavy elements
29Iron has 26 protons in its nucleus, and gold has 79 protons. Where did all the gold on the Earth come from?
- ANucleosynthesis on the surfaces of neutron stars
- BNucleosynthesis that took place in supernova explosions
- CNucleosynthesis in the cores of low-mass stars
- DNucleosynthesis in the cores of massive stars
- ENucleosynthesis in red giant and horizontal-branch stars
30According to Einstein's relativity, which two quantities are different manifestations of the same thing?
- AMass and gravity
- BLight and energy
- CEnergy and mass
- DTemperature and energy
- EDistance and time
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- Astronomy 104 Exam 2
- Author
- Natalie Balzert
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- English
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