Question 1

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.E) C) and D)
F) A) and B)

Question 2

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.E) A) and B)
F) All of the above

Question 3

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.E) None of the above
F) A) and C)

Question 4

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.E) B) and C)
F) C) and D)

Question 5

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.E) C) and D)
F) B) and D)

Question 6

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.E) All of the above
F) A) and D)

Question 7

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.E) A) and B)
F) B) and D)

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.E) A) and B)
F) None of the above

Question 9

The sun is a(n)

Accepted Answer

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

Question 10

White dwarfs

Accepted Answer

A)  are young stars.
B)  are old stars.
C)  may be of any age.
D)  are extremely rare.E) A) and B)
F) All of the above

Question 11

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.E) B) and D)
F) C) and D)

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.E) A) and B)
F) C) and D)

Question 13

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.E) B) and D)
F) A) and B)

Question 14

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.E) B) and C)
F) C) and D)

Question 15

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.E) B) and C)
F) None of the above

Question 16

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.E) B) and C)
F) A) and C)

Question 17

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.E) B) and D)
F) B) and C)

Question 18

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.E) C) and D)
F) B) and C)

Question 19

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.E) A) and C)
F) B) and D)

Question 20

Sunspot activity does not affect

Accepted Answer

A)  auroras.
B)  the earth's magnetic field.
C)  volcanic eruptions.
D)  shortwave radio communications.E) B) and D)
F) All of the above

Exam 18: The Stars

A large modern astronomical telescope

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Neutron stars are about

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White dwarfs

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

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The distance of a star from the earth can be found

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Streams of protons and electrons from the sun do not affect

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The sun has

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

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Sunspot activity does not affect

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Auroras consist of

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Cepheid variable stars

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In the HR diagram, most stars are

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Brown dwarfs

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

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The sun is a(n)

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The smallest of the following celestial objects is

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

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The sun will remain its present size and temperature

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White dwarf stars are not

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The size of a star can be found from its

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