Question 1

The Doppler shifting of radiation from the early universe has resulted in today's universe being bathed in a sea of

Accepted Answer

A)  cosmic rays.
B)  X-rays.
C)  radio waves.
D)  infrared waves.E) None of the above
F) A) and D) C

Question 2

Considering matter and energy together, the largest component of the universe seems to be

Accepted Answer

A)  electromagnetic radiation of various kinds.
B)  ordinary matter.
C)  dark matter.
D)  dark energy.E) A) and B)
F) B) and D)

Question 3

The "dark matter" that all galaxies apparently contain

Accepted Answer

A)  consists of antimatter.
B)  consists of cosmic rays.
C)  consists of dead stars.
D)  is of unknown nature.E) C) and D)
F) All of the above

Question 4

The number of galaxies in the universe seems to be about

Accepted Answer

A)  200.
B)  200,000.
C)  200 million.
D)  200 billion.E) A) and B)
F) B) and C)

Question 5

The stars in globular clusters

Accepted Answer

A)  are relatively close together.
B)  have an average spacing like that of stars in the galactic disk.
C)  are relatively far apart.
D)  form spiral arms.E) A) and D)
F) B) and D)

Question 6

In a "closed" universe

Accepted Answer

A)  expansion of the universe will continue forever.
B)  no additional new stars will form.
C)  the universe will neither expand nor collapse.
D)  expansion will stop and the universe will ultimately collapse.E) A) and B)
F) A) and C)

Question 7

The number of stars in our galaxy is approximately

Accepted Answer

A)  10,000.
B)  10 million.
C)  1 billion.
D)  100 billion.E) A) and D)
F) B) and D)

Question 8

Emissions of various kinds from near the center of the Milky Way galaxy suggests the presence of a

Accepted Answer

A)  quasar.
B)  globular cluster.
C)  black hole.
D)  galactic nebula.E) B) and D)
F) A) and B)

Question 9

The stars in our galaxy

Accepted Answer

A)  move entirely at random.
B)  move toward its center.
C)  move away from its center.
D)  revolve around its center.E) A) and C)
F) All of the above

Question 10

Nearly all the helium in the universe was formed in

Accepted Answer

A)  the first few minutes after the big bang.
B)  the interior of stars.
C)  supernova explosions.
D)  black holes.E) C) and D)
F) None of the above

Question 11

Immediately after the big bang, the universe contained

Accepted Answer

A)  only matter.
B)  equal amounts of matter and antimatter.
C)  slightly more matter than antimatter.
D)  slightly more antimatter than matter.E) None of the above
F) B) and D)

Question 12

Information about the origin of the universe does not come from the

Accepted Answer

A)  fact that spiral galaxies rotate.
B)  red shifts in galactic spectra.
C)  relative abundances of hydrogen and helium.
D)  cosmic background radiation.E) A) and D)
F) A) and C)

Question 13

The expansion of the universe apparently

Accepted Answer

A)  has always occurred at the same rate.
B)  is currently slowing down.
C)  is currently speeding up.
D)  has come to a stop.E) A) and B)
F) A) and C)

Question 14

The stars in the disk of our galaxy are mostly distributed

Accepted Answer

A)  uniformly.
B)  at random.
C)  in 1 spiral arm.
D)  in 2 spiral arms.E) All of the above
F) A) and D)

Question 15

Primary cosmic rays consist of

Accepted Answer

A)  atomic nuclei, mainly protons.
B)  neutral atoms, mainly of hydrogen.
C)  molecules.
D)  electrons.E) None of the above
F) A) and B)

Question 16

The cosmic background radiation today

Accepted Answer

A)  is present only in galaxies.
B)  is present everywhere in the universe.
C)  accounts for less of the radiation in the universe than starlight.
D)  is visible as a faint glow in the sky on dark nights.E) B) and C)
F) A) and D)

Question 17

The ratio of dark matter to ordinary matter in our galaxy is about

Accepted Answer

A)  1:1.
B)  2:1.
C)  6:1.
D)  25:1.E) C) and D)
F) B) and D) C

Question 18

Communications with planets outside the solar system are most likely to be achieved using

Accepted Answer

A)  spacecraft of the kind that went to the moon.
B)  spacecraft that travel with the speed of light.
C)  spacecraft that travel faster than light.
D)  radio waves.E) None of the above
F) All of the above

Question 19

Interstellar space in our galaxy

Accepted Answer

A)  is completely empty.
B)  is completely empty except for clouds of gas and dust.
C)  contains about 1 atom or molecule per cm3.
D)  contains about 1 atom or molecule per cm3 between denser clouds of gas and dust.E) C) and D)
F) A) and B)

Question 20

Some, and perhaps all, spiral galaxies have at their centers

Accepted Answer

A)  quasars.
B)  pulsars.
C)  black holes.
D)  globular star clusters.E) A) and B)
F) All of the above C

Exam 19: Universe

The Doppler shifting of radiation from the early universe has resulted in today's universe being bathed in a sea of

Correct AnswerverifiedC

Considering matter and energy together, the largest component of the universe seems to be

Correct AnswerverifiedShow Answer

The "dark matter" that all galaxies apparently contain

Correct AnswerverifiedShow Answer

The number of galaxies in the universe seems to be about

Correct AnswerverifiedShow Answer

The stars in globular clusters

Correct AnswerverifiedShow Answer

In a "closed" universe

Correct AnswerverifiedShow Answer

The number of stars in our galaxy is approximately

Correct AnswerverifiedShow Answer

Emissions of various kinds from near the center of the Milky Way galaxy suggests the presence of a

Correct AnswerverifiedShow Answer

The stars in our galaxy

Correct AnswerverifiedShow Answer

Nearly all the helium in the universe was formed in

Correct AnswerverifiedShow Answer

Immediately after the big bang, the universe contained

Correct AnswerverifiedShow Answer

Information about the origin of the universe does not come from the

Correct AnswerverifiedShow Answer

The expansion of the universe apparently

Correct AnswerverifiedShow Answer

The stars in the disk of our galaxy are mostly distributed

Correct AnswerverifiedShow Answer

Primary cosmic rays consist of

Correct AnswerverifiedShow Answer

The cosmic background radiation today

Correct AnswerverifiedShow Answer

The ratio of dark matter to ordinary matter in our galaxy is about

Correct AnswerverifiedC

Communications with planets outside the solar system are most likely to be achieved using

Correct AnswerverifiedShow Answer

Interstellar space in our galaxy

Correct AnswerverifiedShow Answer

Some, and perhaps all, spiral galaxies have at their centers

Correct AnswerverifiedC

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C

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C