Question 1

In order to determine the mass of a star, it must be

Accepted Answer

A)  part of the main sequence. 
B)  part of a binary-star system. 
C)  be a Cepheid variable. 
D)  be relatively close. 
A)  part of the main sequence. 
B)  part of a binary-star system. 
C)  be a Cepheid variable. 
D)  be relatively close.

Question 2

Because the spectra of most stars consist of dark lines on a bright background, these stars must

Accepted Answer

A)  have cool interiors surrounded by hot atmospheres. 
B)  have hot interiors surrounded by cool atmospheres. 
C)  have hot interiors surrounded by hot atmospheres. 
D)  have cool interiors surrounded by cool atmospheres. 
A)  have cool interiors surrounded by hot atmospheres. 
B)  have hot interiors surrounded by cool atmospheres. 
C)  have hot interiors surrounded by hot atmospheres. 
D)  have cool interiors surrounded by cool atmospheres.

Question 3

Relatively few stars become

Accepted Answer

A)  members of the main sequence. 
B)  red giants. 
C)  white dwarfs. 
D)  supernovas. 
A)  members of the main sequence. 
B)  red giants. 
C)  white dwarfs. 
D)  supernovas.

Question 4

At the end of its period in the main sequence, a star whose mass is near that of the sun

Accepted Answer

A)  breaks up into several smaller stars. 
B)  cools down into a white dwarf. 
C)  expands into a red giant. 
D)  explodes into a supernova. 
A)  breaks up into several smaller stars. 
B)  cools down into a white dwarf. 
C)  expands into a red giant. 
D)  explodes into a supernova.

Question 5

The temperature of a star directly affects its

Accepted Answer

A)  mass. 
B)  color. 
C)  composition. 
D)  age. 
A)  mass. 
B)  color. 
C)  composition. 
D)  age.

Question 6

A large modern astronomical telescope

Accepted Answer

A)  is designed for high magnifications. 
B)  uses a single lens. 
C)  uses a single mirror. 
D)  uses a number of smaller mirrors. 
A)  is designed for high magnifications. 
B)  uses a single lens. 
C)  uses a single mirror. 
D)  uses a number of smaller mirrors.

Question 7

The main sequence on the HR diagram includes

Accepted Answer

A)  the sun. 
B)  white dwarfs. 
C)  red giants. 
D)  pulsars. 
A)  the sun. 
B)  white dwarfs. 
C)  red giants. 
D)  pulsars.

Question 8

The source of the sun's energy is

Accepted Answer

A)  radioactivity. 
B)  nuclear fission. 
C)  nuclear fusion. 
D)  combustion. 
A)  radioactivity. 
B)  nuclear fission. 
C)  nuclear fusion. 
D)  combustion.

Question 9

Brown dwarfs

Accepted Answer

A)  are members of the main sequence. 
B)  are on the way to becoming white dwarfs. 
C)  do not have enough mass to become true stars. 
D)  are extremely rare. 
A)  are members of the main sequence. 
B)  are on the way to becoming white dwarfs. 
C)  do not have enough mass to become true stars. 
D)  are extremely rare.

Question 10

Which of the following can appear as disks with the help of a telescope?

Accepted Answer

A)  planets 
B)  main-sequence stars 
C)  red giants 
D)  supernovas 
A)  planets 
B)  main-sequence stars 
C)  red giants 
D)  supernovas

Question 11

Nuclear reactions in the sun's interior convert

Accepted Answer

A)  hydrogen into helium. 
B)  helium into hydrogen. 
C)  carbon into nitrogen. 
D)  uranium into plutonium. 
A)  hydrogen into helium. 
B)  helium into hydrogen. 
C)  carbon into nitrogen. 
D)  uranium into plutonium.

Question 12

Sunspots

Accepted Answer

A)  are hotter than the rest of the solar surface. 
B)  are dark clouds floating in the solar atmosphere. 
C)  occur at random intervals. 
D)  are correlated with a number of terrestrial effects. 
A)  are hotter than the rest of the solar surface. 
B)  are dark clouds floating in the solar atmosphere. 
C)  occur at random intervals. 
D)  are correlated with a number of terrestrial effects.

Question 13

The interior of the sun consists of

Accepted Answer

A)  liquid hydrogen. 
B)  molecules. 
C)  neutral atoms. 
D)  ions. 
A)  liquid hydrogen. 
B)  molecules. 
C)  neutral atoms. 
D)  ions.

In order to determine the mass of a star, it must be

Because the spectra of most stars consist of dark lines on a bright background, these stars must

Relatively few stars become

At the end of its period in the main sequence, a star whose mass is near that of the sun

The temperature of a star directly affects its

A large modern astronomical telescope

The main sequence on the HR diagram includes

The source of the sun's energy is

Brown dwarfs

Which of the following can appear as disks with the help of a telescope?

Nuclear reactions in the sun's interior convert

Sunspots

The interior of the sun consists of

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Universe Galaxies

Filters

Exam 18: The Stars

In order to determine the mass of a star, it must be

Because the spectra of most stars consist of dark lines on a bright background, these stars must

Relatively few stars become

At the end of its period in the main sequence, a star whose mass is near that of the sun

The temperature of a star directly affects its

A large modern astronomical telescope

The main sequence on the HR diagram includes

The source of the sun's energy is

Brown dwarfs

Which of the following can appear as disks with the help of a telescope?

Nuclear reactions in the sun's interior convert

Sunspots

The interior of the sun consists of

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Universe Galaxies

Filters