Question 1

Sunspot activity does not affect

Accepted Answer

A) auroras. 
B) the earth's magnetic field. 
C) volcanic eruptions. 
D) shortwave radio communications. 
A) auroras. 
B) the earth's magnetic field. 
C) volcanic eruptions. 
D) shortwave radio communications.

Question 2

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 3

The sun has

Accepted Answer

A) no atmosphere. 
B) an atmosphere just above its surface only. 
C) an atmosphere that extends only as far as the earth. 
D) an atmosphere that extends well out into the solar system. 
A) no atmosphere. 
B) an atmosphere just above its surface only. 
C) an atmosphere that extends only as far as the earth. 
D) an atmosphere that extends well out into the solar system.

Question 4

White dwarfs

Accepted Answer

A) are young stars. 
B) are old stars. 
C) may be of any age. 
D) are extremely rare. 
A) are young stars. 
B) are old stars. 
C) may be of any age. 
D) are extremely rare.

Question 5

In the HR diagram, most stars are

Accepted Answer

A) members of the main sequence. 
B) red giants. 
C) white dwarfs. 
D) scattered at random. 
A) members of the main sequence. 
B) red giants. 
C) white dwarfs. 
D) scattered at random.

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

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 8

The distance of a star from the earth can be found

Accepted Answer

A) only if it is part of a double-star system. 
B) by comparing its luminosity and brightness. 
C) from its color. 
D) from its position in the HR diagram. 
A) only if it is part of a double-star system. 
B) by comparing its luminosity and brightness. 
C) from its color. 
D) from its position in the HR diagram.

Question 9

Auroras consist of

Accepted Answer

A) colored clouds. 
B) comet tails. 
C) excited gases in the lower atmosphere. 
D) excited gases in the upper atmosphere. 
A) colored clouds. 
B) comet tails. 
C) excited gases in the lower atmosphere. 
D) excited gases in the upper atmosphere.

Question 10

White dwarf stars are not

Accepted Answer

A) comparable in size with the earth. 
B) comparable in mass with the sun. 
C) extremely hot. 
D) extremely bright. 
A) comparable in size with the earth. 
B) comparable in mass with the sun. 
C) extremely hot. 
D) extremely bright.

Question 11

The smallest of the following celestial objects is

Accepted Answer

A) a white dwarf. 
B) a neutron star. 
C) a planetary nebula. 
D) the earth. 
A) a white dwarf. 
B) a neutron star. 
C) a planetary nebula. 
D) the earth.

Question 12

The sun will remain its present size and temperature

Accepted Answer

A) for a few thousand years longer. 
B) for a few million years longer. 
C) for a few billion years longer. 
D) forever. 
A) for a few thousand years longer. 
B) for a few million years longer. 
C) for a few billion years longer. 
D) forever.

Question 13

A star must have a certain minimum mass in order that gravity squeeze its matter sufficiently to

Accepted Answer

A) hold it together as a single body. 
B) produce a temperature high enough for it to glow. 
C) produce a temperature high enough for nuclear reactions to start. 
D) turn its interior into liquid hydrogen. 
A) hold it together as a single body. 
B) produce a temperature high enough for it to glow. 
C) produce a temperature high enough for nuclear reactions to start. 
D) turn its interior into liquid hydrogen.

Question 14

Streams of protons and electrons from the sun do not affect

Accepted Answer

A) auroras. 
B) the airglow of the night sky. 
C) comet heads. 
D) comet tails. 
A) auroras. 
B) the airglow of the night sky. 
C) comet heads. 
D) comet tails.

Question 15

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 16

The size of a star can be found from its

Accepted Answer

A) temperature and mass. 
B) temperature and brightness. 
C) temperature and luminosity. 
D) mass and apparent brightness. 
A) temperature and mass. 
B) temperature and brightness. 
C) temperature and luminosity. 
D) mass and apparent brightness.

Question 17

Cepheid variable stars

Accepted Answer

A) are very bright, easily seen stars. 
B) have luminosities related to their periods of variation. 
C) have very short periods of variation. 
D) all lie in the constellation Cepheus. 
A) are very bright, easily seen stars. 
B) have luminosities related to their periods of variation. 
C) have very short periods of variation. 
D) all lie in the constellation Cepheus.

Question 18

Neutron stars are about

Accepted Answer

A) the size of a large house. 
B) 20 km in diameter. 
C) the size of the moon. 
D) the size of Jupiter. 
A) the size of a large house. 
B) 20 km in diameter. 
C) the size of the moon. 
D) the size of Jupiter.

Question 19

The sun is a(n)

Accepted Answer

A) unusually small star. 
B) unusually large star. 
C) unusually hot star. 
D) rather ordinary star. 
A) unusually small star. 
B) unusually large star. 
C) unusually hot star. 
D) rather ordinary star.

Question 20

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.

Sunspot activity does not affect

Brown dwarfs

The sun has

White dwarfs

In the HR diagram, most stars are

A large modern astronomical telescope

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

The distance of a star from the earth can be found

Auroras consist of

White dwarf stars are not

The smallest of the following celestial objects is

The sun will remain its present size and temperature

A star must have a certain minimum mass in order that gravity squeeze its matter sufficiently to

Streams of protons and electrons from the sun do not affect

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

The size of a star can be found from its

Cepheid variable stars

Neutron stars are about

The sun is a(n)

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

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

Filters

Exam 18: The Stars

Sunspot activity does not affect

Brown dwarfs

The sun has

White dwarfs

In the HR diagram, most stars are

A large modern astronomical telescope

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

The distance of a star from the earth can be found

Auroras consist of

White dwarf stars are not

The smallest of the following celestial objects is

The sun will remain its present size and temperature

A star must have a certain minimum mass in order that gravity squeeze its matter sufficiently to

Streams of protons and electrons from the sun do not affect

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

The size of a star can be found from its

Cepheid variable stars

Neutron stars are about

The sun is a(n)

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

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

Filters