Question 1

Type II supernovae are believed to occur when the cores of massive stars collapse.

Accepted Answer

A) True 
 B)False

Question 2

In the diagram below, which point indicates the location on the H-R diagram of a one-solar-mass star when it undergoes helium flash?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) All of the above

Question 3

As a white dwarf cools its radius will not change because

Accepted Answer

A)   pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing.
B)   pressure does not depend on temperature for a white dwarf because the electrons are degenerate.
C)   pressure does not depend on temperature because the white dwarf is too hot.
D)   pressure does not depend on temperature because the star has exhausted all its nuclear fuels.
E)   material accreting onto it from a companion maintains a constant radius.F) A) and B)
G) B) and C)

Question 4

A(n)  ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Accepted Answer

A)   Herbig-Haro object
B)   globular cluster
C)   open cluster
D)   giant cluster
E)   supernovaF) A) and B)
G) C) and D)

Question 5

Stars less massive than 0.4 solar mass never become giant stars.

Accepted Answer

A) True 
 B)False

Question 6

A nova is almost always associated with

Accepted Answer

A)   a very massive star.
B)   a very young star.
C)   a star undergoing helium flash.
D)   a white dwarf in a close binary system.
E)   a solar-like star that has exhausted its hydrogen and helium.F) D) and E)
G) A) and E)

Question 7

About how long will a 0.5-  star spend on the main sequence?

Accepted Answer

A)   5 billion years
B)   57 billion years
C)   570 million years
D)   5 million years
E)   500 thousand yearsF) B) and C)
G) None of the above

Question 8

Stars that have ejected a planetary nebula eventually become

Accepted Answer

A)   protostars.
B)   brown dwarfs.
C)   white dwarfs.
D)   red giants.E) A) and C)
F) A) and D)

Question 9

A white dwarf is composed of

Accepted Answer

A)   hydrogen nuclei and degenerate electrons.
B)   helium nuclei and normal electrons.
C)   carbon and oxygen nuclei and degenerate electrons.
D)   degenerate iron nuclei.
E)   a helium burning core and a hydrogen burning shell.F) B) and C)
G) B) and E)

Question 10

The Chandrasekhar limit tells us that

Accepted Answer

A)   accretion disks can grow hot through friction.
B)   neutron stars of more than 3 solar masses are not stable.
C)   white dwarfs more massive than 1.4 solar masses are not stable.
D)   stars cannot travel through space too fast.
E)   stars with a mass less than 0.5 solar masses will not go through helium flash.F) None of the above
G) C) and E)

Question 11

The central star in a planetary nebula

Accepted Answer

A)   is a main-sequence star.
B)   is a pre-main-sequence protostar.
C)   is a neutron star.
D)   will become a white dwarf.E) All of the above
F) None of the above

Question 12

A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

Accepted Answer

The answer of A gas in which the pressure no...

Question 13

A nova destroys the star and leaves behind a white dwarf.

Accepted Answer

A) True 
 B)False

Question 14

Before it ejects a planetary nebula, a star is a

Accepted Answer

A)   red giant.
B)   black hole.
C)   white dwarf.
D)   supernova.E) B) and D)
F) A) and D)

Question 15

Giant and supergiant stars are rare because

Accepted Answer

A)   they do not form as often as main-sequence stars.
B)   the star blows up before the giant or supergiant stage is reached
C)   the giant or supergiant stage is very short.
D)   the giant or supergiant stage is very longE) A) and C)
F) A) and D)

Question 16

A(n) ____________________ supernova is caused by the collapse of a massive star that has lost its outer envelope of hydrogen.

Accepted Answer

The answer of A(n) ____________________ supernova is caused by the...

Question 17

What properties of degenerate matter are important to the structure of stars? Why?

Accepted Answer

The answer of What properties of degenerate matter are important...

Question 18

Where are elements heavier than iron primarily produced?

Accepted Answer

A)   brown dwarfs
B)   white dwarfs
C)   supergiants
D)   supernovaeE) B) and C)
F) None of the above

Question 19

In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by

Accepted Answer

A)   a globular cluster.
B)   a planetary nebulae.
C)   a white dwarf.
D)   a young massive star.
E)   a supernova remnant.F) A) and B)
G) A) and C)

Question 20

A white dwarf star is prevented from collapsing by

Accepted Answer

A)   nuclear energy it is generating.
B)   its gravitational force.
C)   Hubble's law of extragalactic redshifts.
D)   degenerate electron gas pressure.
E)   degenerate astronomers observing the star.F) B) and D)
G) A) and B)

Exam 10: The Deaths of Stars

Before it ejects a planetary nebula, a star is a

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A(n) ____________________ supernova is caused by the collapse of a massive star that has lost its outer envelope of hydrogen.

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A nova destroys the star and leaves behind a white dwarf.

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Type II supernovae are believed to occur when the cores of massive stars collapse.

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Stars that have ejected a planetary nebula eventually become

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A gas in which the pressure no longer depends on the temperature of the gas is said to be ____________________.

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A white dwarf is composed of

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A white dwarf star is prevented from collapsing by

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The Chandrasekhar limit tells us that

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Where are elements heavier than iron primarily produced?

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In the diagram below, which point indicates the location on the H-R diagram of a one-solar-mass star when it undergoes helium flash?

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A nova is almost always associated with

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As a white dwarf cools its radius will not change because

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A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

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What properties of degenerate matter are important to the structure of stars? Why?

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Giant and supergiant stars are rare because

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The central star in a planetary nebula

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Stars less massive than 0.4 solar mass never become giant stars.

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In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by

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About how long will a 0.5- star spend on the main sequence?

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