Question 1

A normal spiral with a bright nucleus and tightly wound spiral arms is classified

Accepted Answer

A) Sba 
B) SBc 
C) Sa 
D) Sc 
A) Sba 
B) SBc 
C) Sa 
D) Sc C

Question 2

A super massive black hole at the center of the Andromeda Galaxy is estimated to contain between __________ solar masses.

Accepted Answer

A) 100 to 1000 
B) 1000 to 100,000 
C) 10 million to 100 million 
D) 10 billion to 100 billion 
A) 100 to 1000 
B) 1000 to 100,000 
C) 10 million to 100 million 
D) 10 billion to 100 billion C

Question 3

A galaxy at a distance of 10 Mpc is moving away from us at a speed of 800 km/s.What would be the recession speed of a galaxy at a distance of 5 Mpc?

Accepted Answer

A) 800 km/s 
B) 1600 km/s 
C) 3200 km/s 
D) 400 km/s 
A) 800 km/s 
B) 1600 km/s 
C) 3200 km/s 
D) 400 km/s D

Question 4

Hubble's relationship between the distance to a galaxy and its speed of recession is interpreted as evidence for

Accepted Answer

A) The expansion of the universe 
B) Galaxies being outside the Milky Way 
C) The evolution of galaxies 
D) The Doppler effect 
A) The expansion of the universe 
B) Galaxies being outside the Milky Way 
C) The evolution of galaxies 
D) The Doppler effect

Question 5

The masses of galaxies are often determined by

Accepted Answer

A) Determining their star formation rates 
B) Counting their stars 
C) Measuring their tidal forces on the Milky Way 
D) Measuring their rotation curves 
A) Determining their star formation rates 
B) Counting their stars 
C) Measuring their tidal forces on the Milky Way 
D) Measuring their rotation curves

Question 6

Black hole masses at the centers of galaxies can be estimated by ___________ .

Accepted Answer

A) measuring the absolute brightness of the galaxy. 
B) measuring the orbital speeds of stars near the galactic center. 
C) observing the overall shape of the galaxy. 
D) determining the galactic type. 
A) measuring the absolute brightness of the galaxy. 
B) measuring the orbital speeds of stars near the galactic center. 
C) observing the overall shape of the galaxy. 
D) determining the galactic type.

Question 7

One would expect the Hertzsprung-Russell diagram of an elliptical galaxy to resemble that of a(n)

Accepted Answer

A) Globular star cluster 
B) Open star cluster 
C) Star formation region 
D) Irregular galaxy. 
A) Globular star cluster 
B) Open star cluster 
C) Star formation region 
D) Irregular galaxy.

Question 8

The Magellanic clouds are

Accepted Answer

A) Regions of star formation in the Andromeda galaxy 
B) Close clusters of galaxies about 10 Mpc away 
C) Nearby irregular galaxies gravitationally bound to the Milky Way 
D) An optical illusion caused by dust in the interplanetary medium 
E) Regions of little gas and dust in the plane of the galaxy 
A) Regions of star formation in the Andromeda galaxy 
B) Close clusters of galaxies about 10 Mpc away 
C) Nearby irregular galaxies gravitationally bound to the Milky Way 
D) An optical illusion caused by dust in the interplanetary medium 
E) Regions of little gas and dust in the plane of the galaxy

Question 9

A barred spiral with loosely wound arms would be classified

Accepted Answer

A) SBc 
B) Sb 
C) BS 
D) S0a 
A) SBc 
B) Sb 
C) BS 
D) S0a

Question 10

The most numerous galaxies are probably

Accepted Answer

A) Irregulars 
B) Spirals. 
C) Ellipticals 
D) Barred spirals 
A) Irregulars 
B) Spirals. 
C) Ellipticals 
D) Barred spirals

Question 11

Which type of galaxy contains the least amount of interstellar material?

Accepted Answer

A) Ellipticals 
B) Spirals 
C) Barred spirals 
D) Irregulars 
A) Ellipticals 
B) Spirals 
C) Barred spirals 
D) Irregulars

Question 12

A primary difference between spiral and elliptical galaxies is

Accepted Answer

A) All ellipticals are more massive than spirals 
B) Ellipticals have more extensive interstellar media than spirals 
C) Star formation has ceased in ellipticals,but not in spirals 
D) Spirals have more stars than ellipticals 
A) All ellipticals are more massive than spirals 
B) Ellipticals have more extensive interstellar media than spirals 
C) Star formation has ceased in ellipticals,but not in spirals 
D) Spirals have more stars than ellipticals

Question 13

A collision of two large spiral galaxies is likely to result in the formation of what type of galaxy?

Accepted Answer

A) Barred spiral 
B) Normal spiral 
C) Elliptical 
D) None of the above,galaxies pass through each other with little interaction between them. 
A) Barred spiral 
B) Normal spiral 
C) Elliptical 
D) None of the above,galaxies pass through each other with little interaction between them.

Question 14

Which of the following is the best analogy for Hubble's law of recession of the galaxies?

Accepted Answer

A) Raisins carried apart by dough in a rising loaf of raisin bread 
B) Fragments of an exploding bomb 
C) Leaves blown from a tree by the wind 
D) An ocean current carrying a sailboat against the wind 
A) Raisins carried apart by dough in a rising loaf of raisin bread 
B) Fragments of an exploding bomb 
C) Leaves blown from a tree by the wind 
D) An ocean current carrying a sailboat against the wind

Question 15

A strong argument in favor of the theory that the universe is expanding is the observation of the

Accepted Answer

A) Ratio of helium to hydrogen of .25 
B) Red shift of galaxies 
C) Cosmic background radiation 
D) Existence of quasars 
A) Ratio of helium to hydrogen of .25 
B) Red shift of galaxies 
C) Cosmic background radiation 
D) Existence of quasars

Question 16

How was Hubble able to determine the distances of nearby galaxies?

Accepted Answer

A) By measuring the expansion speeds of supernova shells 
B) By measuring trigonometric parallaxes 
C) By measuring their radial velocities 
D) By observing Cepheid variables in them 
A) By measuring the expansion speeds of supernova shells 
B) By measuring trigonometric parallaxes 
C) By measuring their radial velocities 
D) By observing Cepheid variables in them

Question 17

Which of the following is the best description of an SBc galaxy?

Accepted Answer

A) A barred spiral galaxy with loose,open arms 
B) A spiral galaxy with tightly wound arms 
C) A relatively faint quasar 
D) An irregular galaxy in the Sculptor cluster 
A) A barred spiral galaxy with loose,open arms 
B) A spiral galaxy with tightly wound arms 
C) A relatively faint quasar 
D) An irregular galaxy in the Sculptor cluster

Question 18

A spiral galaxy with a small nucleus and loosely wound spiral arms would be classified

Accepted Answer

A) Sc 
B) Sba 
C) S0 
D) Sa 
A) Sc 
B) Sba 
C) S0 
D) Sa

Question 19

Which of the following was used by some astronomers in the early 1900s to argue that spiral nebulae were nearby objects?

Accepted Answer

A) Their large parallaxes 
B) Measurements taken several years apart that showed rotation 
C) Their small Doppler shifts 
D) An absence of globular clusters in spiral nebulae 
A) Their large parallaxes 
B) Measurements taken several years apart that showed rotation 
C) Their small Doppler shifts 
D) An absence of globular clusters in spiral nebulae

Question 20

Suppose a galaxy has a flat rotation curve.How does the amount of mass within 20 kpc compare to the amount of mass within 10 kpc?

Accepted Answer

A) Twice as great 
B) 4 times as great 
C) Half as great 
D) One-quarter as great 
A) Twice as great 
B) 4 times as great 
C) Half as great 
D) One-quarter as great

Exam 23: Galaxies

A normal spiral with a bright nucleus and tightly wound spiral arms is classified

A super massive black hole at the center of the Andromeda Galaxy is estimated to contain between __________ solar masses.

A galaxy at a distance of 10 Mpc is moving away from us at a speed of 800 km/s.What would be the recession speed of a galaxy at a distance of 5 Mpc?

Hubble's relationship between the distance to a galaxy and its speed of recession is interpreted as evidence for

The masses of galaxies are often determined by

Black hole masses at the centers of galaxies can be estimated by ___________ .

One would expect the Hertzsprung-Russell diagram of an elliptical galaxy to resemble that of a(n)

The Magellanic clouds are

A barred spiral with loosely wound arms would be classified

The most numerous galaxies are probably

Which type of galaxy contains the least amount of interstellar material?

A primary difference between spiral and elliptical galaxies is

A collision of two large spiral galaxies is likely to result in the formation of what type of galaxy?

Which of the following is the best analogy for Hubble's law of recession of the galaxies?

A strong argument in favor of the theory that the universe is expanding is the observation of the

How was Hubble able to determine the distances of nearby galaxies?

Which of the following is the best description of an SBc galaxy?

A spiral galaxy with a small nucleus and loosely wound spiral arms would be classified

Which of the following was used by some astronomers in the early 1900s to argue that spiral nebulae were nearby objects?

Suppose a galaxy has a flat rotation curve.How does the amount of mass within 20 kpc compare to the amount of mass within 10 kpc?

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