Question 1

Stars are made mostly of

Accepted Answer

A)  helium. 
B)  oxygen. 
C)  hydrogen. 
D)  nitrogen. 
A)  helium. 
B)  oxygen. 
C)  hydrogen. 
D)  nitrogen.

Question 2

What is the difference between brightness and luminosity?

Accepted Answer

A)  These are different names for the same property. 
B)  Luminosity is how we see a star;brightness is how much light it emits. 
C)  Brightness is how we see a star;luminosity is how much light it emits. 
D)  Luminosity measures size;brightness measures temperature. 
A)  These are different names for the same property. 
B)  Luminosity is how we see a star;brightness is how much light it emits. 
C)  Brightness is how we see a star;luminosity is how much light it emits. 
D)  Luminosity measures size;brightness measures temperature.

Question 3

The stars that have the largest radii are classified as

Accepted Answer

A)  giants. 
B)  ultragiants. 
C)  supergiants. 
D)  dwarfs. 
A)  giants. 
B)  ultragiants. 
C)  supergiants. 
D)  dwarfs.

Question 4

Stars of similar temperatures but different sizes

Accepted Answer

A)  will have similar luminosities but different masses. 
B)  will have similar masses but different distances. 
C)  will have different spectral types but similar luminosities. 
D)  will have similar spectral types but different luminosities. 
A)  will have similar luminosities but different masses. 
B)  will have similar masses but different distances. 
C)  will have different spectral types but similar luminosities. 
D)  will have similar spectral types but different luminosities.

Question 5

Star A is a red star.Star B is a blue star.Which is hotter?

Accepted Answer

A)  Star A 
B)  Star B 
C)  We also need to know the luminosities of the stars to determine their temperatures. 
D)  Color is not related to temperature at all. 
A)  Star A 
B)  Star B 
C)  We also need to know the luminosities of the stars to determine their temperatures. 
D)  Color is not related to temperature at all.

Question 6

How many arcseconds are there in a degree?

Accepted Answer

A)  60 
B)  360 
C)  3,600 
D)  6,000 
A)  60 
B)  360 
C)  3,600 
D)  6,000

Question 7

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

Accepted Answer

A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars and they have more hydrogen. 
A)  O- and B-type stars are cooler than A-type stars. 
B)  A larger fraction of hydrogen atoms in O- and B-type stars is ionized. 
C)  O- and B-type stars have converted much more of their hydrogen into heavier elements. 
D)  A-type stars have a higher mass than O- and B-type stars and they have more hydrogen.

Question 8

All of the following are useful in determining the masses of stars in a binary system EXCEPT

Accepted Answer

A)  the period of the orbits of the two stars. 
B)  the average separation between the two stars. 
C)  the luminosities of the two stars. 
D)  the velocities of the two stars. 
A)  the period of the orbits of the two stars. 
B)  the average separation between the two stars. 
C)  the luminosities of the two stars. 
D)  the velocities of the two stars.

Question 9

What are the two main chemical elements that make up the Sun? How much of the mass of the Sun is composed of elements other than these two?

Accepted Answer

By mass,the Sun is made up of

Question 10

What type of star is most common in the solar neighborhood?

Accepted Answer

A)  Main sequence 
B)  Supergiant 
C)  White Dwarf 
D)  Giant 
A)  Main sequence 
B)  Supergiant 
C)  White Dwarf 
D)  Giant

Question 11

Stars of spectral class A have the most hydrogen whereas stars of spectral class O have the least hydrogen.

Accepted Answer

A) True 
 B)False

Question 12

If we know the temperature and luminosity of a star,we can also calculate its

Accepted Answer

A)  radius. 
B)  mass. 
C)  chemical composition. 
D)  All of the above 
A)  radius. 
B)  mass. 
C)  chemical composition. 
D)  All of the above

Question 13

How is the distance to a star related to its parallax?

Accepted Answer

A)  Distance is directly proportional to parallax. 
B)  Distance is inversely proportional to parallax. 
C)  Distance is directly proportional to parallax squared. 
D)  Distance is inversely proportional to parallax squared. 
A)  Distance is directly proportional to parallax. 
B)  Distance is inversely proportional to parallax. 
C)  Distance is directly proportional to parallax squared. 
D)  Distance is inversely proportional to parallax squared.

Question 14

Binary star systems are extremely useful in studying stars because they allow us to determine stars' masses.

Accepted Answer

A) True 
 B)False

Question 15

What spectral class is the Sun?

Accepted Answer

A)  A0 
B)  G2 
C)  F5 
D)  M3 
A)  A0 
B)  G2 
C)  F5 
D)  M3

Question 16

The brightest stars in the sky also tend to be

Accepted Answer

A)  very luminous. 
B)  the hottest stars in the sky. 
C)  very near to us. 
D)  All of the above 
A)  very luminous. 
B)  the hottest stars in the sky. 
C)  very near to us. 
D)  All of the above

Question 17

To measure the parallax of the most distant stars measurable,we would make two measurements of the star's position separated by

Accepted Answer

A)  6 hours. 
B)  12 hours. 
C)  6 months. 
D)  12 months. 
A)  6 hours. 
B)  12 hours. 
C)  6 months. 
D)  12 months.

Question 18

A parsec is a unit of time.

Accepted Answer

A) True 
 B)False

Question 19

The star named Capella has an apparent magnitude of 0 while the star named Polaris has an apparent magnitude of 2,which means that Capella is __________ than Polaris.

Accepted Answer

A)  6 times fainter 
B)  2 times fainter 
C)  6 times brighter 
D)  2 times brighter 
A)  6 times fainter 
B)  2 times fainter 
C)  6 times brighter 
D)  2 times brighter

Question 20

Mass solely determines the position of a star on the H-R diagram.

Accepted Answer

A) True 
 B)False

Exam 13: Taking the Measure of Stars

Stars are made mostly of

What is the difference between brightness and luminosity?

The stars that have the largest radii are classified as

Stars of similar temperatures but different sizes

Star A is a red star.Star B is a blue star.Which is hotter?

How many arcseconds are there in a degree?

Why do O- and B-type stars have weaker hydrogen absorption lines than A-type stars?

All of the following are useful in determining the masses of stars in a binary system EXCEPT

What are the two main chemical elements that make up the Sun? How much of the mass of the Sun is composed of elements other than these two?

What type of star is most common in the solar neighborhood?

Stars of spectral class A have the most hydrogen whereas stars of spectral class O have the least hydrogen.

If we know the temperature and luminosity of a star,we can also calculate its

How is the distance to a star related to its parallax?

Binary star systems are extremely useful in studying stars because they allow us to determine stars' masses.

What spectral class is the Sun?

The brightest stars in the sky also tend to be

To measure the parallax of the most distant stars measurable,we would make two measurements of the star's position separated by

A parsec is a unit of time.

The star named Capella has an apparent magnitude of 0 while the star named Polaris has an apparent magnitude of 2,which means that Capella is __________ than Polaris.

Mass solely determines the position of a star on the H-R diagram.

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

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