Question 1

Observed temperature fluctuations in the Cosmic Microwave Background Radiation are

Accepted Answer

A)  millions of kelvins. 
B)  hundreds of kelvins. 
C)  a few kelvins. 
D)  tens of millionths of a kelvin. 
E)  immeasurably small. 
A)  millions of kelvins. 
B)  hundreds of kelvins. 
C)  a few kelvins. 
D)  tens of millionths of a kelvin. 
E)  immeasurably small. D

Question 2

The universe expanded by a factor of 10⁵⁰ during inflation, when the strong force separated from the electromagnetic and weak nuclear forces.

Accepted Answer

A) True 
 B)False  True

Question 3

The redshift of the galaxies is correctly interpreted as

Accepted Answer

A)  a Doppler shift due to the random motions of galaxies in space. 
B)  an aging of light as gravity weakens with time. 
C)  space itself is expanding with time, so the photons are stretched while they travel through space. 
D)  placing our Galaxy near the center of the Local Group. 
E)  the differences in temperatures and star formation in old and young galaxies. 
A)  a Doppler shift due to the random motions of galaxies in space. 
B)  an aging of light as gravity weakens with time. 
C)  space itself is expanding with time, so the photons are stretched while they travel through space. 
D)  placing our Galaxy near the center of the Local Group. 
E)  the differences in temperatures and star formation in old and young galaxies. C

Question 4

The cosmological redshift is a direct measure of the expansion of the universe, thus independent of direction.

Accepted Answer

A) True 
 B)False

Question 5

Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?

Accepted Answer

The Hubble relation requires that the ve

Question 6

The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time.

Accepted Answer

A) True 
 B)False

Question 7

From the 1970s to the present, the accepted value of H has almost doubled, so

Accepted Answer

A)  the age of the universe is twice as old as we originally believed. 
B)  the age of the Universe is half what we believed. 
C)  the Copernican principle is not valid beyond our solar system. 
D)  the ages of the oldest globular clusters are invalid. 
E)  the critical density must also be halved. 
A)  the age of the universe is twice as old as we originally believed. 
B)  the age of the Universe is half what we believed. 
C)  the Copernican principle is not valid beyond our solar system. 
D)  the ages of the oldest globular clusters are invalid. 
E)  the critical density must also be halved.

Question 8

The fate or future of the universe depends only on the total number of galaxies and quasars.

Accepted Answer

A) True 
 B)False

Question 9

Which of these substances must be primordial?

Accepted Answer

A)  Helium 
B)  Lithium 
C)  Deuterium 
D)  Beryllium 
E)  Tritium 
A)  Helium 
B)  Lithium 
C)  Deuterium 
D)  Beryllium 
E)  Tritium

Question 10

The luminous matter in the universe accounts for what percent of the total mass of the universe?

Accepted Answer

A)  About 5% 
B)  About 23% 
C)  About 27% 
D)  About 73% 
E)  100% 
A)  About 5% 
B)  About 23% 
C)  About 27% 
D)  About 73% 
E)  100%

Question 11

The one theory of the early universe before the Recombination Epoch and after the Planck Epoch that was developed to resolve a conflict between observation and theory is

Accepted Answer

A)  the Grand Unified Theory. 
B)  the theory of inflation. 
C)  the theory of nucleosynthesis. 
D)  the theory of recombination. 
E)  the quantum quark theory. 
A)  the Grand Unified Theory. 
B)  the theory of inflation. 
C)  the theory of nucleosynthesis. 
D)  the theory of recombination. 
E)  the quantum quark theory.

Question 12

The low density universe is an open one, with expansion continuing forever.

Accepted Answer

A) True 
 B)False

Question 13

Before the decoupling

Accepted Answer

A)  the Universe was transparent to radiation. 
B)  the Universe was opaque to radiation. 
C)  protons and electrons combined to form atoms. 
D)  there was more helium than hydrogen. 
E)  deuterium produced electrons and positrons. 
A)  the Universe was transparent to radiation. 
B)  the Universe was opaque to radiation. 
C)  protons and electrons combined to form atoms. 
D)  there was more helium than hydrogen. 
E)  deuterium produced electrons and positrons.

Question 14

Does the universe have an edge or a center?

Accepted Answer

Not according to the

Question 15

Why do the oldest stars we observe contain almost nothing but hydrogen and helium?

Accepted Answer

This first generation of stars

Question 16

Which of these did NOT occur at decoupling?

Accepted Answer

A)  The cosmic microwave radiation was released from matter. 
B)  Neutral atoms were formed. 
C)  Matter dominated radiation. 
D)  Electrons began to orbit protons. 
E)  The universe became transparent. 
A)  The cosmic microwave radiation was released from matter. 
B)  Neutral atoms were formed. 
C)  Matter dominated radiation. 
D)  Electrons began to orbit protons. 
E)  The universe became transparent.

Question 17

The universe has been expanding at the same rate since its formation.

Accepted Answer

A) True 
 B)False

Question 18

________ is the concept that the universe looks the same in all directions.

Accepted Answer

The answer of ________ is the concept that the universe...

Question 19

With the exception of a few nearby objects, every galaxy in the universe is rapidly moving away from ours; therefore, ________.

Accepted Answer

The answer of With the exception of a few nearby...

Question 20

The expansion rate of the Universe is

Accepted Answer

A)  increasing. 
B)  decreasing. 
C)  constant. 
D)  different in different directions. 
E)  independent of time. 
A)  increasing. 
B)  decreasing. 
C)  constant. 
D)  different in different directions. 
E)  independent of time.

Observed temperature fluctuations in the Cosmic Microwave Background Radiation are

The universe expanded by a factor of 10⁵⁰ during inflation, when the strong force separated from the electromagnetic and weak nuclear forces.

The redshift of the galaxies is correctly interpreted as

The cosmological redshift is a direct measure of the expansion of the universe, thus independent of direction.

Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?

The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time.

From the 1970s to the present, the accepted value of H has almost doubled, so

The fate or future of the universe depends only on the total number of galaxies and quasars.

Which of these substances must be primordial?

The luminous matter in the universe accounts for what percent of the total mass of the universe?

The one theory of the early universe before the Recombination Epoch and after the Planck Epoch that was developed to resolve a conflict between observation and theory is

The low density universe is an open one, with expansion continuing forever.

Before the decoupling

Does the universe have an edge or a center?

Why do the oldest stars we observe contain almost nothing but hydrogen and helium?

Which of these did NOT occur at decoupling?

The universe has been expanding at the same rate since its formation.

________ is the concept that the universe looks the same in all directions.

With the exception of a few nearby objects, every galaxy in the universe is rapidly moving away from ours; therefore, ________.

The expansion rate of the Universe is

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Filters

Exam 15: Cosmology and the Universe

Observed temperature fluctuations in the Cosmic Microwave Background Radiation are

The universe expanded by a factor of 10⁵⁰ during inflation, when the strong force separated from the electromagnetic and weak nuclear forces.

The redshift of the galaxies is correctly interpreted as

The cosmological redshift is a direct measure of the expansion of the universe, thus independent of direction.

Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?

The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time.

From the 1970s to the present, the accepted value of H has almost doubled, so

The fate or future of the universe depends only on the total number of galaxies and quasars.

Which of these substances must be primordial?

The luminous matter in the universe accounts for what percent of the total mass of the universe?

The one theory of the early universe before the Recombination Epoch and after the Planck Epoch that was developed to resolve a conflict between observation and theory is

The low density universe is an open one, with expansion continuing forever.

Before the decoupling

Does the universe have an edge or a center?

Why do the oldest stars we observe contain almost nothing but hydrogen and helium?

Which of these did NOT occur at decoupling?

The universe has been expanding at the same rate since its formation.

________ is the concept that the universe looks the same in all directions.

With the exception of a few nearby objects, every galaxy in the universe is rapidly moving away from ours; therefore, ________.

The expansion rate of the Universe is

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Galaxies

Filters