Question 1

The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?

Accepted Answer

A)  The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. 
B)  The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. 
C)  The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. 
D)  The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs. 
A)  The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. 
B)  The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. 
C)  The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. 
D)  The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.

Question 2

The more distant a star, the smaller its parallax.

Accepted Answer

A) True 
 B)False

Question 3

The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________.

Accepted Answer

A)  Vega is nearer than 10 parsecs from Earth. 
B)  Vega has a parallax angle of 1/10 arcsecond. 
C)  Vega's luminosity is less than that of our Sun. 
D)  Vega's surface temperature is cooler than the Sun. 
A)  Vega is nearer than 10 parsecs from Earth. 
B)  Vega has a parallax angle of 1/10 arcsecond. 
C)  Vega's luminosity is less than that of our Sun. 
D)  Vega's surface temperature is cooler than the Sun.

Question 4

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once.
 
-Which group represents stars that are hot and very bright?

Accepted Answer

The answer of The following questions refer to the sketch...

Question 5

On a Hertzsprung-Russell diagram, where would you find white dwarfs?

Accepted Answer

A)  upper right 
B)  lower right 
C)  upper left 
D)  lower left 
A)  upper right 
B)  lower right 
C)  upper left 
D)  lower left

Question 6

What is the common trait of all main sequence stars?

Accepted Answer

A)  They generate energy through hydrogen fusion in their core. 
B)  They are in the final stage of their lives. 
C)  They are all spectral type G. 
D)  They all have approximately the same mass. 
A)  They generate energy through hydrogen fusion in their core. 
B)  They are in the final stage of their lives. 
C)  They are all spectral type G. 
D)  They all have approximately the same mass.

Question 7

Which of the following stellar properties has the greatest range in values?

Accepted Answer

A)  mass 
B)  radius 
C)  core temperature 
D)  surface temperature 
E)  luminosity 
A)  mass 
B)  radius 
C)  core temperature 
D)  surface temperature 
E)  luminosity

Question 8

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once.
 
-Which group represents stars that are hot but dim?

Accepted Answer

The answer of The following questions refer to the sketch...

Question 9

You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is

Accepted Answer

A)  10 light-years. 
B)  10 parsecs. 
C)  0.1 light-year. 
D)  0.1 parsec. 
E)  impossible to determine. 
A)  10 light-years. 
B)  10 parsecs. 
C)  0.1 light-year. 
D)  0.1 parsec. 
E)  impossible to determine.

Question 10

Which of the following statements about globular clusters is true?

Accepted Answer

A)  All stars in the cluster are approximately at the same stage in their evolution. 
B)  Most of the stars in the cluster are younger than 10 billion years. 
C)  Most stars in the cluster are yellow or reddish in color. 
D)  All stars in the cluster have approximately the same mass. 
E)  There is an approximately equal number of all types of stars in the cluster. 
A)  All stars in the cluster are approximately at the same stage in their evolution. 
B)  Most of the stars in the cluster are younger than 10 billion years. 
C)  Most stars in the cluster are yellow or reddish in color. 
D)  All stars in the cluster have approximately the same mass. 
E)  There is an approximately equal number of all types of stars in the cluster.

Question 11

Which of the following is the most numerous type of main-sequence star?

Accepted Answer

A)  an O star 
B)  an A star 
C)  an F star 
D)  a G star 
E)  an M star 
A)  an O star 
B)  an A star 
C)  an F star 
D)  a G star 
E)  an M star

Question 12

Blue stars are always more luminous than red stars

Accepted Answer

A) True 
 B)False

Question 13

The size of the Earth's orbit is doubled. This will allow the parallaxes of more distant stars to be measured.

Accepted Answer

A) True 
 B)False

Question 14

The total amount of power (in watts, for example) that a star radiates into space is called its ________.

Accepted Answer

A)  apparent brightness 
B)  absolute magnitude 
C)  luminosity 
D)  flux 
A)  apparent brightness 
B)  absolute magnitude 
C)  luminosity 
D)  flux

Question 15

On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim?

Accepted Answer

A)  upper right 
B)  lower right 
C)  upper left 
D)  lower left 
A)  upper right 
B)  lower right 
C)  upper left 
D)  lower left

Question 16

What are the standard units for luminosity?

Accepted Answer

A)  Watts 
B)  Joules 
C)  Newtons 
D)  kilograms 
E)  Watts per second 
A)  Watts 
B)  Joules 
C)  Newtons 
D)  kilograms 
E)  Watts per second

Question 17

Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?

Accepted Answer

A)  Spectral type M2, luminosity class I 
B)  Spectral type M1, luminosity class V 
C)  Spectral type O9, luminosity class I 
D)  Spectral type G2, luminosity class V 
A)  Spectral type M2, luminosity class I 
B)  Spectral type M1, luminosity class V 
C)  Spectral type O9, luminosity class I 
D)  Spectral type G2, luminosity class V

Question 18

Some stars are cool enough to have molecules in their atmosphere.

Accepted Answer

A) True 
 B)False

Question 19

You measure the parallax angle for a star to be 0.5 arcseconds. The distance to this star is

Accepted Answer

A)  0.5 light-year. 
B)  0.5 parsec. 
C)  5 light-years. 
D)  5 parsecs. 
E)  2 parsecs. 
A)  0.5 light-year. 
B)  0.5 parsec. 
C)  5 light-years. 
D)  5 parsecs. 
E)  2 parsecs.

Question 20

The following questions refer to the sketch of the H-R diagram below. Choose the best answer in each case. Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choice (c) or (d) offers a better answer to a particular question than (a) , use the best choice. You may use the same choice more than once.
 
-Which group includes stars that are burning elements besides hydrogen in their cores?

Accepted Answer

The answer of The following questions refer to the sketch...

The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?

The more distant a star, the smaller its parallax.

The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________.

On a Hertzsprung-Russell diagram, where would you find white dwarfs?

What is the common trait of all main sequence stars?

Which of the following stellar properties has the greatest range in values?

You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is

Which of the following statements about globular clusters is true?

Which of the following is the most numerous type of main-sequence star?

Blue stars are always more luminous than red stars

The size of the Earth's orbit is doubled. This will allow the parallaxes of more distant stars to be measured.

The total amount of power (in watts, for example) that a star radiates into space is called its ________.

On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim?

What are the standard units for luminosity?

Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?

Some stars are cool enough to have molecules in their atmosphere.

You measure the parallax angle for a star to be 0.5 arcseconds. The distance to this star is

Our Place in the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of Planetary Systems: Our Solar System and Beyond

Earth and the Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Our Star

Star Stuff

Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundation of Modern Cosmology

Dark Matter, Dark Energy, and the Fate of the Universe

The Beginning of Time

Life in the Universe

Filters

Exam 11: Surveying the Stars

The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?

The more distant a star, the smaller its parallax.

The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________.

On a Hertzsprung-Russell diagram, where would you find white dwarfs?

What is the common trait of all main sequence stars?

Which of the following stellar properties has the greatest range in values?

You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is

Which of the following statements about globular clusters is true?

Which of the following is the most numerous type of main-sequence star?

Blue stars are always more luminous than red stars

The size of the Earth's orbit is doubled. This will allow the parallaxes of more distant stars to be measured.

The total amount of power (in watts, for example) that a star radiates into space is called its ________.

On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim?

What are the standard units for luminosity?

Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?

Some stars are cool enough to have molecules in their atmosphere.

You measure the parallax angle for a star to be 0.5 arcseconds. The distance to this star is

Our Place in the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of Planetary Systems: Our Solar System and Beyond

Earth and the Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Our Star

Star Stuff

Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundation of Modern Cosmology

Dark Matter, Dark Energy, and the Fate of the Universe

The Beginning of Time

Life in the Universe

Filters