Question 1

Which of the following is NOT a property of a pulsar?

Accepted Answer

A)  period of 1.34 seconds
B)  over time, the period is gradually increasing
C)  emissions only in the visible part of the spectrum
D)  each pulse consisting of a 0.01 second burst of radiation
E)  time interval between pulses is very uniform

Question 2

In a neutron star, the core is:

Accepted Answer

A)  made of compressed neutrons in contact with each other.
B)  electrons and protons packed so tightly they are in contact.
C)  constantly expanding and contracting.
D)  primarily iron and silicon.
E)  no longer rotating.

Question 3

Neutron stars are formed by:

Accepted Answer

A)  the star formation process.
B)  mass transfer in binary star systems.
C)  novae.
D)  type I supernovae.
E)  type II supernovae.

Question 4

What explanation does general relativity provide for gravity?

Accepted Answer

A)  Gravity is the result of curved spacetime.
B)  Gravity is directly proportional to the mass of the attracting body.
C)  Gravity is inversely proportion to the radius of the body.
D)  Gravity is the opposite of the electromagnetic force.
E)  Gravity can affect only massive particles, not massless photons.

Question 5

A proposed explanation for gamma-ray bursters is:

Accepted Answer

A)  hypernova-making black holes and bipolar jets.
B)  coalescence of a neutron star binary.
C)  collisions between two white dwarfs.
D)  Both A and B are possible.
E)  All three are possible.

Question 6

X-ray bursters occur in binary star systems. The two types of stars that must be present tomake up such an object are:

Accepted Answer

A)  a white dwarf and a neutron star.
B)  a contact binary system of two red giants.
C)  a white dwarf and a main sequence star.
D)  a main sequence or giant star and a neutron star in a mass transfer binary.
E)  two neutron stars in a mass transfer binary.

Question 7

A method for identifying a black hole is to:

Accepted Answer

A)  look for voids in the star fields.
B)  look for their effects on nearby companions.
C)  locate a visible star that disappears when the black hole passes in front of it.
D)  search for radio waves from the accretion disk.
E)  search for their pulsar signal.

Question 8

A black hole may be visible because electromagnetic radiation is emitted from a(n)________ surrounding it, heated up enough to emit X-rays.

Accepted Answer

The answer of A black hole may be visible because...

Question 9

X-ray bursters are similar to novae, except the collapsed star is a neutron star, not a whitedwarf.

Accepted Answer

A) True 
 B)False

Question 10

The largest known black holes:

Accepted Answer

A)  create the dark nebulae in the plane of the Milky Way.
B)  can be no more than 1.4 solar masses, according to Chandrasekhar.
C)  lie in the cores of the most massive galaxies.
D)  can be no bigger than a small city, just like neutron stars.
E)  can be no bigger than the Earth, like white dwarfs.

Question 11

Inside the ________, nothing, not even light, can escape from a black hole.

Accepted Answer

The answer of Inside the ________, nothing, not even light,...

Question 12

Which of the following can actually escape from inside a black hole's event horizon?

Accepted Answer

A)  neutrinos
B)  electrons
C)  very high energy gamma rays
D)  gravitons
E)  none of the above

Question 13

The mass range for neutron stars is:

Accepted Answer

A)  .08 to .4 solar masses.
B)  .4 to 3 solar masses.
C)  1.4 to 3 solar masses.
D)  3 to 8 solar masses.
E)  6 to 11 solar masses.

Question 14

In the Lighthouse Model:

Accepted Answer

A)  the star literally turns on and off like a lighthouse beacon.
B)  all pulsars must have their poles pointed directly toward us.
C)  if the beam sweeps across us, we will detect a pulse of radiation.
D)  the period of pulsation must speed up as the neutron star continues collapsing.
E)  the period of pulsation slows down due to the drag of the remnant on its field.

Question 15

Why do scientists describe the theory of gravity as "incomplete"?

Accepted Answer

A)  It does not incorporate a description of matter on a very small scale.
B)  It does not explain why light bends near a dense object.
C)  It does not agree with the expansion of the universe.
D)  The gravitational waves it predicts have not been observed.
E)  It does not explain the effects on time from a massive object.

Question 16

Which of the following are attracted by gravity?

Accepted Answer

A)  antimatter
B)  any object with mass
C)  electromagnetic radiation
D)  neutrinos
E)  all of the above

Question 17

Relatively long duration gamma-ray bursts are produced by:

Accepted Answer

A)  novae.
B)  supernovae.
C)  hypernovae.
D)  neutron star mergers.
E)  black hole mergers.

Question 18

You would expect millisecond pulsars to be:

Accepted Answer

A)  part of a binary system.
B)  isolated in space.
C)  rotating slowly.
D)  most common in open clusters.
E)  collapsing rapidly.

Question 19

What compelling evidence links pulsars to neutron stars?

Accepted Answer

A)  Both pulsars and neutron stars can be found in globular star clusters.
B)  Pulsars are known to evolve into neutron stars.
C)  Only a small, very dense source could rotate that rapidly without flying apart.
D)  Pulsars are always found in binary systems with neutron stars.
E)  Both pulsars and neutron stars have been discovered near the Sun.

Question 20

Describe the properties of space in the vicinity of a black hole.

Accepted Answer

The geometry of space is warped or curve...

Exam 22: Neutron Stars and Black Holes: Strange States of Matter

You would expect millisecond pulsars to be:

Correct AnswerverifiedShow Answer

A method for identifying a black hole is to:

Correct AnswerverifiedShow Answer

What explanation does general relativity provide for gravity?

Correct AnswerverifiedShow Answer

What compelling evidence links pulsars to neutron stars?

Correct AnswerverifiedShow Answer

The largest known black holes:

Correct AnswerverifiedShow Answer

A proposed explanation for gamma-ray bursters is:

Correct AnswerverifiedShow Answer

Which of the following can actually escape from inside a black hole's event horizon?

Correct AnswerverifiedShow Answer

Why do scientists describe the theory of gravity as "incomplete"?

Correct AnswerverifiedShow Answer

In the Lighthouse Model:

Correct AnswerverifiedShow Answer

In a neutron star, the core is:

Correct AnswerverifiedShow Answer

X-ray bursters occur in binary star systems. The two types of stars that must be present tomake up such an object are:

Correct AnswerverifiedShow Answer

Inside the ________, nothing, not even light, can escape from a black hole.

Correct AnswerverifiedShow Answer

X-ray bursters are similar to novae, except the collapsed star is a neutron star, not a whitedwarf.

Correct AnswerverifiedShow Answer

The mass range for neutron stars is:

Correct AnswerverifiedShow Answer

Which of the following are attracted by gravity?

Correct AnswerverifiedShow Answer

Relatively long duration gamma-ray bursts are produced by:

Correct AnswerverifiedShow Answer

Neutron stars are formed by:

Correct AnswerverifiedShow Answer

A black hole may be visible because electromagnetic radiation is emitted from a(n)________ surrounding it, heated up enough to emit X-rays.

Correct AnswerverifiedShow Answer

Describe the properties of space in the vicinity of a black hole.

Correct AnswerverifiedThe geometry of space is warped or curve...View AnswerShow Answer

Which of the following is NOT a property of a pulsar?

Correct AnswerverifiedShow Answer

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The geometry of space is warped or curve...
View Answer

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