Question 1

Stars seem to twinkle because of

Accepted Answer

A)  variations in their brightnesses. 
B)  variations in their colors. 
C)  turbulent movements in their atmospheres. 
D)  turbulent movements in the earth's atmosphere. 
A)  variations in their brightnesses. 
B)  variations in their colors. 
C)  turbulent movements in their atmospheres. 
D)  turbulent movements in the earth's atmosphere.

Question 2

Black holes are the remnants of

Accepted Answer

A)  stars with small masses. 
B)  stars with large masses. 
C)  white dwarfs. 
D)  black dwarfs. 
A)  stars with small masses. 
B)  stars with large masses. 
C)  white dwarfs. 
D)  black dwarfs.

Question 3

The heaviest elements on the earth were produced in

Accepted Answer

A)  the earth's interior. 
B)  the sun's interior. 
C)  supernova explosions. 
D)  black holes. 
A)  the earth's interior. 
B)  the sun's interior. 
C)  supernova explosions. 
D)  black holes.

Question 4

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 5

The duration of the sunspot cycle is about

Accepted Answer

A)  27 days. 
B)  6 months. 
C)  3 years. 
D)  11 years. 
A)  27 days. 
B)  6 months. 
C)  3 years. 
D)  11 years.

Question 6

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 7

The spectrum of a star can provide information of which one or more of the following?

Accepted Answer

A)  the star's magnetic field 
B)  the star's temperature 
C)  the star's relative motion toward or away from us 
D)  the star's composition 
E)  All of the above 
A)  the star's magnetic field 
B)  the star's temperature 
C)  the star's relative motion toward or away from us 
D)  the star's composition 
E)  All of the above

Question 8

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 9

The color of a relatively hot star is

Accepted Answer

A)  white. 
B)  yellow. 
C)  blue. 
D)  red. 
A)  white. 
B)  yellow. 
C)  blue. 
D)  red.

Question 10

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 11

Stars at the lower end of the main sequence have

Accepted Answer

A)  high temperatures and large masses. 
B)  high temperatures and small masses. 
C)  low temperatures and large masses. 
D)  low temperatures and small masses. 
A)  high temperatures and large masses. 
B)  high temperatures and small masses. 
C)  low temperatures and large masses. 
D)  low temperatures and small masses.

Question 12

A gamma-ray burst is a short, intense flood of gamma rays

Accepted Answer

A)  from the sun. 
B)  from the black hole at the center of our galaxy. 
C)  from a nearby neutron star. 
D)  that may have caused biological extinctions in the past. 
A)  from the sun. 
B)  from the black hole at the center of our galaxy. 
C)  from a nearby neutron star. 
D)  that may have caused biological extinctions in the past.

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

Question 14

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 15

The less the mass of a main-sequence star, the

Accepted Answer

A)  lower its density. 
B)  cooler it is. 
C)  brighter it is. 
D)  shorter its lifetime. 
A)  lower its density. 
B)  cooler it is. 
C)  brighter it is. 
D)  shorter its lifetime.

Question 16

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 17

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 18

What keeps light from escaping from a black hole is its

Accepted Answer

A)  strong electric field. 
B)  strong magnetic field. 
C)  strong gravitational field. 
D)  absorbing atmosphere. 
A)  strong electric field. 
B)  strong magnetic field. 
C)  strong gravitational field. 
D)  absorbing atmosphere.

Question 19

Brown dwarfs are

Accepted Answer

A)  visible to the naked eye. 
B)  present in the solar system. 
C)  relatively rare. 
D)  relatively common. 
A)  visible to the naked eye. 
B)  present in the solar system. 
C)  relatively rare. 
D)  relatively common.

Question 20

The star nearest to the sun is approximately

Accepted Answer

A)  1 light-minute away. 
B)  4 light-years away. 
C)  300 light-years away. 
D)  4000 light-years away. 
A)  1 light-minute away. 
B)  4 light-years away. 
C)  300 light-years away. 
D)  4000 light-years away.

Stars seem to twinkle because of

Black holes are the remnants of

The heaviest elements on the earth were produced in

The size of a star can be found from its

The duration of the sunspot cycle is about

Sunspot activity does not affect

The spectrum of a star can provide information of which one or more of the following?

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

The color of a relatively hot star is

White dwarfs

Stars at the lower end of the main sequence have

A gamma-ray burst is a short, intense flood of gamma rays

In the HR diagram, most stars are

White dwarf stars are not

The less the mass of a main-sequence star, the

The sun will remain its present size and temperature

The distance of a star from the earth can be found

What keeps light from escaping from a black hole is its

Brown dwarfs are

The star nearest to the sun is approximately

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

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Organic Chemistry

Atmosphere and Hydrosphere

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Exam 18: The Stars

Stars seem to twinkle because of

Black holes are the remnants of

The heaviest elements on the earth were produced in

The size of a star can be found from its

The duration of the sunspot cycle is about

Sunspot activity does not affect

The spectrum of a star can provide information of which one or more of the following?

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

The color of a relatively hot star is

White dwarfs

Stars at the lower end of the main sequence have

A gamma-ray burst is a short, intense flood of gamma rays

In the HR diagram, most stars are

White dwarf stars are not

The less the mass of a main-sequence star, the

The sun will remain its present size and temperature

The distance of a star from the earth can be found

What keeps light from escaping from a black hole is its

Brown dwarfs are

The star nearest to the sun is approximately

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