Question 1

Which of the following could NOT be used as a distance indicator for galaxies?

Accepted Answer

A)   large globular clusters
B)   Planets in our own Solar System
C)   Supernovae
D)   Cepheid variable stars
E)   Wrong.All of these could be usedF) C) and D)
G) B) and C)

Question 2

When two galaxies collide,they pass through each other,and their stars almost never collide.

Accepted Answer

A) True 
 B)False

Question 3

The dark matter in galaxies has been hypothesized to be composed of

Accepted Answer

A)   neutral hydrogen clouds.
B)   dust particles.
C)   weakly interacting massive particles.
D)   H II regions of glowing hydorgen gas.
E)   all of the aboveF) A) and D)
G) B) and C)

Question 4

What is the primary factor in determining the classification for an elliptical galaxy?

Accepted Answer

A)   Size
B)   Shape
C)   Mass
D)   ColorE) None of the above
F) A) and C)

Question 5

A tuning fork diagram is shown below.Which of the labeled figures represents an Sa galaxy?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) D) and E)
G) A) and E) E

Question 6

Astronomers now speculate that a galaxy's shape depends on all of the following EXCEPT

Accepted Answer

A)   the rate of star formation.
B)   the history of past collisions.
C)   the mass.
D)   its direction in the sky as seen from Earth
E)   All of the above are important in determining a galaxy's shape.F) A) and E)
G) A) and D)

Question 7

We should expect galaxies to collide with each other fairly often because

Accepted Answer

A)   a galaxy's size is comparable to (but smaller than) the average distance between galaxies.
B)   galaxies contain large amounts of neutral hydrogen.
C)   galaxies occur in clusters.
D)   a and c
E)   none of the aboveF) A) and D)
G) B) and C)

Question 8

The units on the Hubble constant are ____________________.

Accepted Answer

The answer of The units on the Hubble constant are...

Question 9

If H equals 50 km/sec/Mpc,then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc.

Accepted Answer

A) True 
 B)False

Question 10

Most of the mass of a galaxy is contained in the

Accepted Answer

A)   massive O and B stars in the galaxy.
B)   neutral hydrogen gas H I regions of the galaxy.
C)   ionized hydrogen gas H II regions of the galaxy.
D)   dark matter halo of the galaxy.
E)   disk ofstars in the galaxy.F) B) and D)
G) A) and B)

Question 11

The rotation curve of a galaxy (orbital speed versus distance) can be used to determine

Accepted Answer

A)   the colors of hot young stars in the galaxy.
B)   the elements which make up the galaxy.
C)   the direction in the sky of the galaxy.
D)   the age of the galaxy.
E)   the mass of the galaxy.F) C) and E)
G) None of the above

Question 12

What distance method did Edwin Hubble use to determine the distance to local galaxies?

Accepted Answer

A)   Hubble Law
B)   Supernova observations
C)   Period-luminosity relationship of variable stars
D)   ParallaxE) C) and D)
F) B) and D) C

Question 13

An E galaxy contains

Accepted Answer

A)   mostly lower-main sequence stars and giants.
B)   mostly upper main sequence stars and giants.
C)   mostly upper main sequence stars and gas and dust.
D)   roughly equal numbers of upper and lower main sequence stars.
E)   mostly white dwarfs and supergiants.F) C) and D)
G) A) and B)

Question 14

An irregular galaxy contains

Accepted Answer

A)   mostly lower-main sequence stars and giants.
B)   mostly upper main sequence stars and giants.
C)   mostly upper main sequence stars and gas and dust.
D)   upper and lower main sequence stars and gas and dust.
E)   mostly white dwarfs and supergiants.F) A) and B)
G) A) and C)

Question 15

Elliptical galaxies are primarily made up of massive O and B stars.

Accepted Answer

A) True 
 B)False  False

Question 16

When a large galaxy collides with a small galaxy,the smaller galaxy may be pulled apart by tidal forces.

Accepted Answer

A) True 
 B)False

Question 17

An elliptical galaxy could

Accepted Answer

A)   evolve into an irregular galaxy when it has used up all of its gas and dust.
B)   be formed from the collision and merger of spiral galaxies.
C)   evolve from a single spiral galaxy when the spiral has used up all of its gas and dust.
D)   become a solar system some day.
E)   be at the center of our Solar SystemF) A) and B)
G) B) and E)

Question 18

The most massive galaxies are

Accepted Answer

A)   spiral galaxies.
B)   giant elliptical galaxies.
C)   dwarf elliptical galaxies.D) None of the above
E) A) and C)

Question 19

____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium

Accepted Answer

The answer of ____________________ clusters of galaxies contain closely spaced...

Question 20

____________________ galaxies have a definite disk component but contain no evidence of spiral pattern,few hot young stars,and little gas and dust.

Accepted Answer

The answer of ____________________ galaxies have a definite disk component...

Exam 16: Galaxies

Which of the following could NOT be used as a distance indicator for galaxies?

Correct AnswerverifiedShow Answer

When two galaxies collide,they pass through each other,and their stars almost never collide.

Correct AnswerverifiedShow Answer

The dark matter in galaxies has been hypothesized to be composed of

Correct AnswerverifiedShow Answer

What is the primary factor in determining the classification for an elliptical galaxy?

Correct AnswerverifiedShow Answer

A tuning fork diagram is shown below.Which of the labeled figures represents an Sa galaxy?

Correct AnswerverifiedE

Astronomers now speculate that a galaxy's shape depends on all of the following EXCEPT

Correct AnswerverifiedShow Answer

We should expect galaxies to collide with each other fairly often because

Correct AnswerverifiedShow Answer

The units on the Hubble constant are ____________________.

Correct AnswerverifiedShow Answer

If H equals 50 km/sec/Mpc,then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc.

Correct AnswerverifiedShow Answer

Most of the mass of a galaxy is contained in the

Correct AnswerverifiedShow Answer

The rotation curve of a galaxy (orbital speed versus distance) can be used to determine

Correct AnswerverifiedShow Answer

What distance method did Edwin Hubble use to determine the distance to local galaxies?

Correct AnswerverifiedC

An E galaxy contains

Correct AnswerverifiedShow Answer

An irregular galaxy contains

Correct AnswerverifiedShow Answer

Elliptical galaxies are primarily made up of massive O and B stars.

Correct AnswerverifiedFalse

When a large galaxy collides with a small galaxy,the smaller galaxy may be pulled apart by tidal forces.

Correct AnswerverifiedShow Answer

An elliptical galaxy could

Correct AnswerverifiedShow Answer

The most massive galaxies are

Correct AnswerverifiedShow Answer

____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium

Correct AnswerverifiedShow Answer

____________________ galaxies have a definite disk component but contain no evidence of spiral pattern,few hot young stars,and little gas and dust.

Correct AnswerverifiedShow Answer

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E

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C

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False

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