Question 1

In a large sampling of stars,the largest group represented in the H-R diagram will be the main sequence stars.Why are they so common?

Accepted Answer

Like the Sun,they are young enough to st

Question 2

In an eclipsing binary,the longer the stages of the eclipse take,the ________ the star.

Accepted Answer

The answer of In an eclipsing binary,the longer the stages...

Question 3

What is the absolute magnitude of our Sun?

Accepted Answer

A)  -23.0 
B)  -4.6 
C)  -1.4 
D)  +4.8 
E)  +9.4 
A)  -23.0 
B)  -4.6 
C)  -1.4 
D)  +4.8 
E)  +9.4

Question 4

Star A is a main sequence star of spectral type G5 and star B is a red giant of spectral type K2.Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B. 
B)  Star B appears brighter than star A. 
C)  Star A is hotter than star B. 
D)  Star B is hotter than star A. 
E)  None of the above can be said about these two stars. 
A)  Star A appears brighter than star B. 
B)  Star B appears brighter than star A. 
C)  Star A is hotter than star B. 
D)  Star B is hotter than star A. 
E)  None of the above can be said about these two stars.

Question 5

In order to turn a star's proper motion into its space velocity,we must also know:

Accepted Answer

A)  its mass and spectral type. 
B)  its temperature and age. 
C)  its distance and radial velocity. 
D)  its distance and mass. 
E)  its spectral type and period of rotation. 
A)  its mass and spectral type. 
B)  its temperature and age. 
C)  its distance and radial velocity. 
D)  its distance and mass. 
E)  its spectral type and period of rotation.

Question 6

How can a white dwarf be hotter than our Sun,yet much less luminous?

Accepted Answer

They are only about

Question 7

First magnitude Spica appears 2.5 times brighter than second magnitude Polaris.

Accepted Answer

A) True 
 B)False

Question 8

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

Accepted Answer

The answer of A star with a parallax of 1...

Question 9

What physical property of a star does the spectral type measure?

Accepted Answer

A)  density 
B)  luminosity 
C)  temperature 
D)  mass 
E)  composition 
A)  density 
B)  luminosity 
C)  temperature 
D)  mass 
E)  composition

Question 10

On the H-R diagram,most bright naked eye stars would lie at the ________.

Accepted Answer

The answer of On the H-R diagram,most bright naked eye...

Question 11

How might the most common occurring stars be described,based on our stellar neighborhood?

Accepted Answer

A)  white dwarfs 
B)  K giants 
C)  G main sequence 
D)  A main sequence 
E)  M main sequence 
A)  white dwarfs 
B)  K giants 
C)  G main sequence 
D)  A main sequence 
E)  M main sequence

Question 12

In the H-R diagram,the bright blue-white stars that dominate the naked eye sky lie to the:

Accepted Answer

A)  top left. 
B)  top right. 
C)  middle of the main sequence. 
D)  top center. 
E)  bottom left. 
A)  top left. 
B)  top right. 
C)  middle of the main sequence. 
D)  top center. 
E)  bottom left.

Question 13

The most famous G type star is:

Accepted Answer

A)  Polaris. 
B)  Betelguese. 
C)  Sirius. 
D)  the Sun. 
E)  Pollux. 
A)  Polaris. 
B)  Betelguese. 
C)  Sirius. 
D)  the Sun. 
E)  Pollux.

Question 14

What is the typical main sequence lifetime of an M-type star?

Accepted Answer

A)  one million years 
B)  ten million years 
C)  one billion years 
D)  ten billion years 
E)  a trillion years 
A)  one million years 
B)  ten million years 
C)  one billion years 
D)  ten billion years 
E)  a trillion years

Question 15

If a star were moved 10 times farther away,its absolute magnitude would drop five magnitudes.

Accepted Answer

A) True 
 B)False

Question 16

The nearest naked-eye star to our Sun,Alpha Centauri,is still over a parsec distant.

Accepted Answer

A) True 
 B)False

Question 17

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

Accepted Answer

A)  distance 
B)  luminosity or absolute magnitude 
C)  brightness or apparent magnitude 
D)  size or density 
E)  mass 
A)  distance 
B)  luminosity or absolute magnitude 
C)  brightness or apparent magnitude 
D)  size or density 
E)  mass

Question 18

On the main sequence on an H-R diagram,our Sun lies at about ________.

Accepted Answer

The answer of On the main sequence on an H-R...

Question 19

Star A and star B both have an apparent magnitude of 7.0,but star A is at a distance of 15 pc and star B is at a distance of 30 pc.Which statement below is correct?

Accepted Answer

A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above. 
A)  Star A appears brighter than star B, but actually star B and star A are the same brightness. 
B)  Star B appears brighter than star A, but actually star B and star A are the same brightness. 
C)  Star A and star B appear to have the same brightness, but actually star B is brighter than star A. 
D)  Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 
E)  It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Question 20

Stars that have masses similar to the Sun's,and sizes similar to the Earth are:

Accepted Answer

A)  main sequence stars. 
B)  white dwarfs. 
C)  red giants. 
D)  red dwarfs. 
E)  brown dwarfs. 
A)  main sequence stars. 
B)  white dwarfs. 
C)  red giants. 
D)  red dwarfs. 
E)  brown dwarfs.

Exam 17: The Stars: Giants,Dwarfs,and the Main Sequence

In a large sampling of stars,the largest group represented in the H-R diagram will be the main sequence stars.Why are they so common?

In an eclipsing binary,the longer the stages of the eclipse take,the ________ the star.

What is the absolute magnitude of our Sun?

Star A is a main sequence star of spectral type G5 and star B is a red giant of spectral type K2.Which statement below is correct?

In order to turn a star's proper motion into its space velocity,we must also know:

How can a white dwarf be hotter than our Sun,yet much less luminous?

First magnitude Spica appears 2.5 times brighter than second magnitude Polaris.

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

What physical property of a star does the spectral type measure?

On the H-R diagram,most bright naked eye stars would lie at the ________.

How might the most common occurring stars be described,based on our stellar neighborhood?

In the H-R diagram,the bright blue-white stars that dominate the naked eye sky lie to the:

The most famous G type star is:

What is the typical main sequence lifetime of an M-type star?

If a star were moved 10 times farther away,its absolute magnitude would drop five magnitudes.

The nearest naked-eye star to our Sun,Alpha Centauri,is still over a parsec distant.

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

On the main sequence on an H-R diagram,our Sun lies at about ________.

Star A and star B both have an apparent magnitude of 7.0,but star A is at a distance of 15 pc and star B is at a distance of 30 pc.Which statement below is correct?

Stars that have masses similar to the Sun's,and sizes similar to the Earth are:

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information from the Cosmos

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone?

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