Question 1

Most of the atoms in the universe are thought to be

Accepted Answer

A) hydrogen. 
B) helium. 
C) about equal amounts of hydrogen and helium. 
D) iron. 
E) elements unknown at present. 
A) hydrogen. 
B) helium. 
C) about equal amounts of hydrogen and helium. 
D) iron. 
E) elements unknown at present.

Question 2

As more and more mass falls into a black hole,the radius of its photon sphere

Accepted Answer

A) increases. 
B) decreases. 
C) remains unaffected. 
A) increases. 
B) decreases. 
C) remains unaffected.

Question 3

The background stars during a solar eclipse are those of constellations

Accepted Answer

A) of the opposite season. 
B) seen in the nighttime sky. 
C) not seen normally. 
D) seen in the opposite hemisphere. 
A) of the opposite season. 
B) seen in the nighttime sky. 
C) not seen normally. 
D) seen in the opposite hemisphere.

Question 4

Most white dwarfs

Accepted Answer

A) have relatively hot surfaces. 
B) have relatively cool surfaces. 
C) evolve into black holes. 
D) are about as dense as their parent stars. 
A) have relatively hot surfaces. 
B) have relatively cool surfaces. 
C) evolve into black holes. 
D) are about as dense as their parent stars.

Question 5

The determining factor in the stages a star will progress through from birth to death is its

Accepted Answer

A) mass. 
B) temperature. 
C) composition. 
D) relative density. 
A) mass. 
B) temperature. 
C) composition. 
D) relative density.

Question 6

Which is the earliest stage of a star?

Accepted Answer

A) Helium collects within the core. 
B) Carbon collects within the core. 
C) The surface of the star expands into a red giant. 
D) The star contracts into a blue giant. 
A) Helium collects within the core. 
B) Carbon collects within the core. 
C) The surface of the star expands into a red giant. 
D) The star contracts into a blue giant.

Question 7

A black hole is

Accepted Answer

A) an empty region of space with a huge gravitational field. 
B) a small region that has the mass of many galaxies. 
C) the remains of a giant collapsed star. 
A) an empty region of space with a huge gravitational field. 
B) a small region that has the mass of many galaxies. 
C) the remains of a giant collapsed star.

Question 8

One of Edwin Hubble's discoveries is that the known universe is expanding.This means that

Accepted Answer

A) most all observable galaxies are moving away from each other. 
B) light rays bend as they near the event horizon of a black hole. 
C) light rays undergo acceleration as they travel vast distances. 
D) the mass of the universe is slowly dissipating. 
A) most all observable galaxies are moving away from each other. 
B) light rays bend as they near the event horizon of a black hole. 
C) light rays undergo acceleration as they travel vast distances. 
D) the mass of the universe is slowly dissipating.

Question 9

A Starburst galaxy has this name because of its

Accepted Answer

A) high rate of star formation. 
B) high rate of supernovae. 
C) large number of pulsars. 
D) large number of neutron stars. 
A) high rate of star formation. 
B) high rate of supernovae. 
C) large number of pulsars. 
D) large number of neutron stars.

Question 10

A star's size stabilizes when

Accepted Answer

A) thermal pressure and gravitational attraction balance each other. 
B) the star's gravitational attraction is balanced by the gravitational attraction to neighboring stars. 
C) the star first ignites. 
D) it reaches temperatures of about 3 million K. 
A) thermal pressure and gravitational attraction balance each other. 
B) the star's gravitational attraction is balanced by the gravitational attraction to neighboring stars. 
C) the star first ignites. 
D) it reaches temperatures of about 3 million K.

Question 11

The yearly motion of celestial objects in the sky is caused by

Accepted Answer

A) the rotation of our planet about its axis. 
B) the revolution of our planet around the Sun. 
C) the movement of our planet within the Milky Way. 
D) the tilt of Earth's axis. 
A) the rotation of our planet about its axis. 
B) the revolution of our planet around the Sun. 
C) the movement of our planet within the Milky Way. 
D) the tilt of Earth's axis.

Question 12

What will halt the collapsing Sun's core once its fuel has been exhausted?

Accepted Answer

A) the inability of electrons to enter into neighboring electrons quantum state 
B) outward thermal pressure 
C) random quantum fluctuations 
D) the shift from fusion to fission nuclear reactions 
A) the inability of electrons to enter into neighboring electrons quantum state 
B) outward thermal pressure 
C) random quantum fluctuations 
D) the shift from fusion to fission nuclear reactions

Question 13

The elements found on Earth have much to do with

Accepted Answer

A) white dwarfs. 
B) neutron stars. 
C) pulsars. 
D) quasars. 
E) supernovae. 
A) white dwarfs. 
B) neutron stars. 
C) pulsars. 
D) quasars. 
E) supernovae.

Question 14

After our Sun burns its supply of hydrogen,it will become a

Accepted Answer

A) white dwarf. 
B) black dwarf. 
C) black hole. 
D) red giant. 
E) blue giant. 
A) white dwarf. 
B) black dwarf. 
C) black hole. 
D) red giant. 
E) blue giant.

Question 15

The gold in Uncle Harry's teeth fillings originated in

Accepted Answer

A) the deep interior of the Earth. 
B) fusion processes that date back about 5.5 billion years. 
C) the Big Bang. 
D) stars that blew up eons ago. 
E) Fort Knox. 
A) the deep interior of the Earth. 
B) fusion processes that date back about 5.5 billion years. 
C) the Big Bang. 
D) stars that blew up eons ago. 
E) Fort Knox.

Question 16

When a star collapses to half size,the gravitational field at its surface

Accepted Answer

A) doubles. 
B) quadruples. 
C) increases eightfold. 
D) remains constant. 
A) doubles. 
B) quadruples. 
C) increases eightfold. 
D) remains constant.

Question 17

What event marks the birth of a star,and what event marks its death?

Accepted Answer

A stellar body becomes a star

Question 18

How far is a light year?

Accepted Answer

A) nearly 10 trillion km 
B) the distance of one Earth orbit 
C) 300,000 km 
D) All of the above 
A) nearly 10 trillion km 
B) the distance of one Earth orbit 
C) 300,000 km 
D) All of the above

Question 19

An active galactic nucleus

Accepted Answer

A) is a place of intense star formation. 
B) arises from the gigantic black hole at the center of a galaxy. 
C) is a supermassive supergiant star that resides at the center of larger galaxies. 
D) is a giant dust cloud at the center of a galaxy. 
A) is a place of intense star formation. 
B) arises from the gigantic black hole at the center of a galaxy. 
C) is a supermassive supergiant star that resides at the center of larger galaxies. 
D) is a giant dust cloud at the center of a galaxy.

Question 20

What do astronomers expect will be left at the center of our solar system once the Sun has gone through all its life stages?

Accepted Answer

A) a planet sized diamond 
B) a red giant 
C) a black hole 
D) a wormhole 
A) a planet sized diamond 
B) a red giant 
C) a black hole 
D) a wormhole

Exam 27: Stars and Galaxies

Most of the atoms in the universe are thought to be

As more and more mass falls into a black hole,the radius of its photon sphere

The background stars during a solar eclipse are those of constellations

Most white dwarfs

The determining factor in the stages a star will progress through from birth to death is its

Which is the earliest stage of a star?

A black hole is

One of Edwin Hubble's discoveries is that the known universe is expanding.This means that

A Starburst galaxy has this name because of its

A star's size stabilizes when

The yearly motion of celestial objects in the sky is caused by

What will halt the collapsing Sun's core once its fuel has been exhausted?

The elements found on Earth have much to do with

After our Sun burns its supply of hydrogen,it will become a

The gold in Uncle Harry's teeth fillings originated in

When a star collapses to half size,the gravitational field at its surface

What event marks the birth of a star,and what event marks its death?

How far is a light year?

An active galactic nucleus

What do astronomers expect will be left at the center of our solar system once the Sun has gone through all its life stages?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

The Structure of Space and Time

Prologue: The Nature of Science

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