Quiz
ASTR 2020 Quiz 5
Questions in this quiz (55)
1The best-known example of a ring galaxy is the Cartwheel galaxy. This was likely formed by:
- Athe merger of two spiral galaxies of equal mass.
- Ban elliptical galaxy evolving into a spiral galaxy.
- Cthe head-on collision between a small galaxy and a disk galaxy.
- Da central black hole eating away at the center of the galaxy, producing a ring.
- Etwo equal-mass spiral galaxies interacting, producing tidal tails that resemble a ring.
2A galaxy with a large bulge relative to the disk and tightly wrapped spiral arms is most likely a/an:
- ASc galaxy.
- BE0 galaxy.
- CS0 galaxy.
- DSd galaxy.
- ESa galaxy.
3Who was the first person to classify spiral and elliptical galaxies into sub-types according to their appearance?
- AHenrietta Leavitt.
- BHarlow Shapley.
- CEdwin Hubble.
- DWilliam Herschel.
- ERobert Trumpler.
4The long tails seen in visible light photographs of the Antennae galaxies were produced from:
- Atidal forces during the collision of two spiral galaxies.
- Btidal forces during the collision of two elliptical galaxies.
- Cjets of charged particles from a massive black hole.
- Dthe head-on collision of a dwarf elliptical galaxy and a disk galaxy.
- Ethe galaxy probably originally formed in that shape, for unknown reasons.
5When a small galaxy passes through the center of the disk of a large spiral galaxy, traveling in a direction perpendicular to the plane of the disk:
- Aa ring galaxy is formed.
- Bmany of the stars in the two galaxies collide, causing numerous supernova.
- Call of the stars from the small galaxy fall into the central black hole of the larger galaxy.
- Dan elliptical galaxy is formed.
- Ethe small galaxy hits the large galaxy, and bounces back in the direction it came from.
6The Hubble Tuning Fork diagram is:
- Aa plot of velocity vs. distance.
- Ba diagram showing the different types of galaxies, in order from ellipticals to irregulars.
- Ca map of the Local Group.
- Da plot of velocity vs. Right Ascension.
- Ea `slice of the Universe' plot.
7Rotation curves of galaxies are plots of:
- AOrbital period vs. Hubble type.
- BNumber of stars vs. distance from center.
- CCircular orbital velocity vs. distance from center.
- DHubble type vs. roundness of shape.
- EHubble type vs. circular orbital velocity.
8The massive black hole in the center of our galaxy is called:
- ACygnus X-1.
- BThe Schwarzchild object.
- CL.G.M.
- DRR Lyrae.
- ESagittarius A*.
9Collisions between galaxies:
- Acause large numbers of stars to collide, and therefore explode.
- Bturn ellipticals into spirals.
- Cmay trigger the formation of many new stars.
- Dalmost never occur.
- Emay occur, but there is no evidence for them.
10An Sb galaxy is:
- Aa giant elliptical galaxy with huge megaparsec-long jets shooting out of the center.
- Ba galaxy similar to the Milky Way.
- Ca spiral galaxy with an extremely luminous nucleus.
- Da spiral galaxy with a pulsar in the center.
- Ea pair of galaxies connected by a stellar bridge, with long stellar tails extending out into space.
11Evidence for dark matter in the Universe includes:
- Alots of gamma rays coming from random directions in the sky.
- Bthe fast orbital velocities of the planets around the Sun.
- Cthe fast orbital velocities of gas and stars in the outer part of the Milky Way.
- Dthere is no observational evidence for dark matter; it is just a theoretical idea.
- Ethe existence of pulsars.
12The ring-like structure of the Cartwheel galaxy was probably formed by:
- Aa massive black hole in the center of the galaxy devoured the stars in the inner part of the galaxy, leaving only an outer ring remaining.
- Ba smaller galaxy passed through the center, creating a ring.
- Cit probably collided with another galaxy more massive than itself.
- Dthe stars in the inner regions exploded as supernovae, leaving a large hole in the center.
- Escientists have no idea why this galaxy has a ring-like structure.
13The instability strip is:
- Aa spiral wave pattern in a galaxy.
- Bthe boundary around a black hole: the point of no return.
- Cthe part of the H-R diagram where Cepheid variables and RR Lyrae stars lie.
- Din a binary pair, the position where the gravitational pull of the two stars is equal.
- Ethe upper mass limit to a white dwarf.
14In the Milky Way, almost all interstellar gas clouds are found:
- AOnly in the halo.
- BIn the bulge, disk, and halo.
- COnly in the disk.
- DOnly in the bulge.
- EOnly in the spiral arms.
15What observations did Harlow Shapley make that indicated that the Sun was not the center of the Milky Way?
- Aobservations of the angular sizes of open clusters.
- Bobservations of variable stars in nearby galaxies.
- Cobservations of variable stars in globular clusters.
- Dobservations of interstellar dust clouds.
- Ehe counted up the number of individual stars in many directions in the sky.
16What produces the 21 cm radio line used to map the rotation curve of the Milky Way?
- Aatomic hydrogen.
- Bionized hydrogen.
- Cmolecular hydrogen.
- Dcarbon monoxide.
- Einterstellar dust.
17Compared with the Sun, most stars in the halo of the Milky Way are:
- Ayounger, redder, and have less heavy chemical elements.
- Byounger, bluer, and have more heavy chemical elements.
- Colder, redder, and have less heavy chemical elements.
- Dolder, bluer, and have more heavy chemical elements.
- Eolder, redder, and have more heavy chemical elements.
18What is the evidence for dark matter in the Milky Way Galaxy?
- AThere is much more infrared radiation coming from the Milky Way than can be accounted for by the known normal stars and interstellar clouds.
- BThere is much more visible light coming from the Milky Way than can be accounted for by the known normal stars and interstellar clouds.
- CThere is much more radio waves coming from the Milky Way than can be accounted for by the known normal stars and interstellar clouds.
- DThe circular velocities of gas and stars in the outer part of the Milky Way are higher than can be accounted for by the known stars and interstellar clouds.
- EThe circular velocities of gas and stars in the outer part of the Milky Way are less than can be accounted for by the known stars and interstellar clouds.
19The mass of the Milky Way Galaxy is about:
- A2 X 10^8 solar masses
- B2 X 10^6 solar masses
- C6 X 10^11 solar masses
- D6000 solar masses
- E2 X 10^4 solar masses
20Which of the following are generally only found in the disk and spiral arms of the Milky Way?
- AO and B stars.
- Bglobular clusters.
- C0.3 solar mass main sequence stars.
- Dwhite dwarf stars.
- EKV and MV stars.
21Cepheid variable stars are:
- Aare used to determine the distances to other galaxies.
- Bare less luminous than RR Lyrae stars.
- Care main sequence O stars.
- Dvary with periods of about 1-10 seconds.
- Eall of the above.
22Approximately how long does it take the Sun to orbit the Milky Way?
- A4.6 billion years.
- B225 million years.
- C1 million years.
- D1000 years.
- E10 years.
23In the Milky Way, globular clusters are found:
- AIn the bulge, halo, and disk.
- BOnly in the disk.
- COnly in the halo.
- DOnly in the spiral arms.
- EOnly in dense molecular clouds.
24The Sun's location in the Milky Way is:
- Anear the center.
- Bin the halo.
- Cin the disk, about two-thirds of the way out from the center.
- Din the bulge.
- Ein a globular cluster.
25If all the stars in the bulge of the Milky Way were replaced by a black hole with the same mass, then:
- AThe Sun would be drawn into this black hole.
- BThe velocity at which the Sun orbits the Galactic Center would decrease.
- CThe velocity at which the Sun orbits the Galactic Center would increase.
- DThe velocity at which the Sun orbits the Galactic Center would stay the same.
- EThe Sun would fly off in a straight line into intergalactic space.
26In the Milky Way, HII regions are found:
- AOnly in the halo.
- BIn the bulge, disk, and halo.
- COnly in the disk.
- DOnly in the bulge.
- EIn the bulge and disk, but not in the halo.
27What astronomical accomplishment is Henrietta Leavitt best remembered for?
- AShe mapped the distribution of globular clusters in the Milky Way using RR Lyrae stars, and showed that the Sun was NOT in the center of the Milky Way.
- BShe estimated the distance to the Andromeda galaxy using Cepheid variable stars, and found it was OUTSIDE the Milky Way.
- CShe discovered the period-luminosity relationship for Cepheid variable stars.
- DShe was the first person to look at the Milky Way with a telescope, and showed that it is made up of many stars.
- EShe discovered the four biggest moons of Jupiter.
28Approximately how many times has the Sun orbited the Milky Way?
- Aa billion times.
- Ba million times.
- C20 times.
- D1 time.
- Eit has never orbited the Milky Way; during the entire life of the Sun, it has only moved a tiny fraction of the full circumference of the Milky Way.
29An RR Lyrae star is:
- AAn eclipsing binary star.
- BA white dwarf in a mass-transfer binary system.
- CA neutron star in a mass-transfer binary system.
- DA variable star which can be used for distance determination.
- EA post-AGB star.
30Jupiter has a mass about 300 times the mass of the Earth. If Jupiter turned into a black hole with the same mass, but nothing else changed,
- Aits moon Europa would be pulled into the black hole.
- Bits moon would orbit around Jupiter at a distance equal to the Schwarzchild radius of the black hole.
- CEuropa would continue in its same orbit.
- Dthe entire solar system would be pulled into this black hole.
- Ethe Schwarzchild radius of this black hole would be about 3000 km.
31The "point of no return" around a black hole, inside which one cannot escape from, is called the:
- AThe Chandrasekhar limit.
- BThe Lagrange point.
- CThe gravitational lens.
- DThe event horizon.
- EThe Pauli Exclusion limit.
32Imagine you are in a rocketship, about 10 Schwarzchild radii away from a black hole. Which of the following would you NEVER observe?
- AX-ray radiation coming out from within the Schwarzchild radius of the black hole.
- BA shift in the apparent position of nearby stars, due to the gravitational effect of the black hole.
- CVery strong tidal forces from the black hole.
- DA shift in the wavelength of light from stars in the direction opposite that of the black hole.
- EYour clocks will run slower than clocks back home on Earth.
33Which of the following has the smallest radius?
- Aa 1 solar mass white dwarf.
- Ba 2 solar mass neutron star.
- Ca 1 solar mass black hole.
- Da 100 solar mass black hole.
- Ea million solar mass black hole.
34The Schwarzchild radius of a black hole is:
- AThe radius of the singularity.
- BThe distance between the black hole and its associated white hole.
- CThe radius of the event horizon.
- DThe distance from the black hole where the gravitational field from the black hole is zero.
- EThe distance from the black hole at which you would be pulled apart by tidal forces.
35Harlow Shapley:
- AProvided the first conclusive evidence that `spiral nebulae' are outside the Milky Way.
- BIdentified the emission lines from pulsars.
- CDiscovered the Period-Luminosity relation for Cepheid variables.
- DMeasured the distances to globular clusters, and concluded the Sun was NOT in the center of the Milky Way.
- EMade a 3-dimensional map of the Milky Way by counted stars and estimating brightnesses, and concluded that the Sun WAS in the center of the Milky Way.
36Henrietta Leavitt:
- AProvided the first conclusive evidence that `spiral nebulae' are outside the Milky Way.
- BIdentified the emission lines from pulsars.
- CDiscovered the Period-Luminosity relation for Cepheid variables.
- DMeasured the distances to globular clusters, and concluded the Sun was NOT in the center of the Milky Way.
- EMade a 3-dimensional map of the Milky Way by counted stars and estimating brightnesses, and concluded that the Sun WAS in the center of the Milky Way.
37The diameter of the disk of the Milky Way is approximately:
- A300 A.U.
- B10 light years.
- C100 thousand light years.
- Da billion light years.
- Ea billion billion light years.
38Where in the Milky Way are Type II supernovae usually located?
- Aonly in the disk.
- Bonly in the halo.
- Conly at the very center.
- Donly in the bulge.
- Ein the disk, halo, and bulge.
39From the orbital velocity of the Sun around the Milky Way, 220 km/s, and the distance from the Sun to the center of the Galaxy, using the relationship V2 = GM/R, one can calculate a mass. This is the mass of:
- Athe Sun.
- BSgr A*.
- Cthe entire Milky Way.
- Dthe part of the Milky Way that is outside of the Sun's orbit.
- Ethe part of the Milky Way galaxy that is inside of the Sun's orbit.
40Synchrotron radiation is produced by:
- Aa hot solid object, like the filament in a light bulb.
- Belectrons in atoms jumping from lower energy levels to higher energy levels.
- Celectrons in atoms jumping from higher energy levels to lower energy levels.
- Dnuclear fusion only.
- Eaccelerated charged particles.
41Who discovered the period-luminosity relationship for Cepheid variable stars?
- AHarlow Shapley.
- BEdwin Hubble.
- CAdriaan van Maanen.
- DWilliam Herschel.
- EHenrietta Leavitt.
42Who first measured the distances to globular clusters, and concluded that the Sun was NOT in the center of the Milky Way?
- AHarlow Shapley.
- BEdwin Hubble.
- CAdriaan van Manaan.
- DWilliam Herschel.
- EHenrietta Leavitt.
- AHarlow Shapley.
43Which of the following objects are NOT generally found in the bulge of the Milky Way, but only in the disk?
- Aplanetary nebulae.
- Bopen clusters.
- Cwhite dwarfs.
- DSupernovae Type I.
- Eglobular clusters.
44Sagittarius A* is:
- Athe brightest supernovae seen in the last 300 years.
- Ba small irregular galaxy in orbit around the Milky Way.
- Ca 10 solar mass black hole in a mass-transfer binary system with a giant star.
- Da 2 million solar mass black hole in the center of the Milky Way.
- Ethe first pulsar ever discovered.
45A black hole is:
- Athe end stage of stellar evolution for an isolated 1 solar mass star.
- Bproduced during a nova.
- Cproduced by an explosion of a white dwarf in a mass transfer system.
- Da really massive object (greater than 106 solar masses).
- Ean object with an escape velocity greater than the speed of light.
46When a charged particle is accelerated, it produces light. This kind of light is called:
- AHeat radiation.
- BThermal radiation.
- CSynchrotron radiation.
- DMagnetic radiation.
- ERR radiation.
47What provided the first evidence of the existence of large quantities of dark matter in the Universe?
- AThe light curves of galaxies.
- BThe rotation curves of galaxies.
- CMapping the distribution of globular clusters in the Milky Way.
- DThe discovery of the period-luminosity relationship for Cepheids.
- EThe discovery of pulsars.
48An RR Lyrae star is:
- Aa white dwarf star undergoing mass transfer from a companion.
- Ba neutron star undergoing mass transfer from a companion.
- Ca star that lies above the main sequence on an HR diagram, in the instability strip.
- Da white dwarf that has cooled to become very dim.
- Ea neutron star with a beam of light that regularly sweeps across the Earth.
49The radius of the event horizon of a black hole is called the:
- AShapley radius.
- BSynchrotron radius.
- CPauli radius.
- DSchwarzchild radius.
- EWormhole radius.
50What phenomenon was observed during the 1919 total solar eclipse?
- AThe positions of stars behind the Sun appeared shifted.
- BThe velocity of the light from stars near the Sun appeared faster than normal.
- CThe velocity of the light from stars near the Sun appeared slower than normal.
- DLight from the Sun was observed to be gravitationally blueshifted.
- EAll of the above.
- AThe positions of stars behind the Sun appeared shifted.
51How far is the Sun from the center of the Milky Way?
- A8 light years.
- B8 parsecs.
- C8 kiloparsecs.
- D8 A.U.
- Ethe Sun is at the center of the Milky Way.
52Who made the first map of the Milky Way by using his telescope to count the stars towards many directions in the sky?
- AHarlow Shapley.
- BEdwin Hubble.
- CAdriaan van Maanen.
- DWilliam Herschel.
- EHenrietta Leavitt.
53On the H-R diagram, Cepheids variables lie:
- Abelow and to the left of the main sequence.
- Bbelow and to the right of the main sequence.
- Con the far right above the main sequence, in the MIII star region.
- Don the main sequence, in the upper left of the diagram.
- Eabove the main sequence in the instability strip.
54Most of the following objects are mainly found in the plane of the disk of the Milky Way, but usually not in the bulge or the halo. Which is the exception, being commonly found in the bulge and halo as well as the disk?
- AHII regions.
- BMolecular clouds.
- COpen clusters.
- DGlobular clusters.
- EO and B stars.
55The first person to find evidence that the Sun is not in the center of the Milky Way was:
- AHenrietta Leavitt.
- BHarlow Shapley.
- CEdwin Hubble.
- DWilliam Herschel.
- ERobert Trumpler.
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- Quiz on ASTR 2020 Quiz 5, created by Taylor Campbell on 14/04/2015.
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- Taylor Campbell
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- Created on 14 Apr 2015 · updated on 19 Feb 2016
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