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QUESTION 2 What is the smallest mass a newborn star can have? 8 times the mass of Jupiter

  1. 80 times the mass of Jupiter
  2. 800 times the mass of Jupiter
  3. about 1/80 the mass of our Sun


QUESTION 3

  1. 21 cm radiation lies in which part of the electromagnetic spectrum?
  2. radio
  3. infrared
  4. violet
  5. ultraviolet

  

QUESTION 4

  1. What is the most important property of a gas cloud that determines the point on the H-R diagram when a star becomes a main sequence star?
  2. initial temperature
  3. size
  4. mass
  5. initial luminosity

2 points  

QUESTION 5

  1. An astronomy news item announces the discovery of a brown dwarf. What is this?
  2. a protostar still embedded in the cloud of gas
  3. a Pluto-like object in the Kuiper belt, beyond the edge of the Solar System
  4. a prestellar object undergoing gravitational collapse
  5. a gas cloud that could have become a star if it had enough mass

2 points  

QUESTION 6

  1. If you wanted to observe stars behind a molecular cloud, in what wavelength of light would you most likely observe?
  2. ultraviolet
  3. visible
  4. infrared
  5. X-ray

2 points  

QUESTION 7

  1. What happens when an interstellar cloud fragment shrinks?
  2. Density rises
  3. Temperature rises
  4. Pressure increases
  5. All of the above

2 points  

QUESTION 8

  1. The helium flash occurs in
  2. low mass red giants
  3. high mass red giants
  4. white dwarfs
  5. neutron stars

2 points  

QUESTION 9

  1. A star spends most of its life as
  2. a protostar
  3. a main sequence star
  4. a red giant
  5. a neutron star

2 points  

QUESTION 10

  1. When a high mass star becomes a red giant, its experiences
  2. a large change in luminosity and a large change in temperature
  3. a negligible change in luminosity but a large change in temperature
  4. a small change in luminosity and a small change in temperature
  5. a large change in luminosity and a negligible change in temperature

2 points  

QUESTION 11

  1. What happens when a main-sequence star exhausts its core hydrogen fuel supply?
  2. The entire star shrinks in size.
  3. The core shrinks while the rest of the star expands.
  4. The core immediately begins to fuse its helium into carbon.
  5. The star becomes a neutron star.

2 points  

QUESTION 12

  1. Compared to the star it evolved from, a white dwarf is
  2. hotter and brighter.
  3. hotter and dimmer.
  4. cooler and brighter.
  5. cooler and dimmer.

2 points  

QUESTION 13

  1. The study of star clusters has helped astronomers to understand
  2. mechanism of mass loss in stars
  3. nuclear fusion in stars
  4. reason why stars have different temperatures
  5. stellar evolution

2 points  

QUESTION 14

  1. In helium burning, the stable end result is
  2. beryllium
  3. more helium
  4. carbon
  5. oxygen

2 points  

QUESTION 15

  1. Of all the elements in your body, the only one not formed in stars 
  2. iron
  3. carbon
  4. calcium
  5. hydrogen

2 points  

QUESTION 16

  1. A star can be a supernova
  2. early in its evolution
  3. only once in its lifetime
  4. many times during the red giant stage
  5. many times depending on the mass

2 points  

QUESTION 17

  1. The ultimate fate of our Sun is to
  2. explode in a supernova.
  3. become a white dwarf that will slowly cool with time.
  4. become a rapidly spinning neutron star.
  5. become a black hole.

2 points  

QUESTION 18

  1. In a white dwarf supernova,
  2. the core is iron
  3. the Chandrasekhar limit for mass is exceeded
  4. many heavy elements are ejected
  5. all are correct

2 points  

QUESTION 19

  1. Which of the following stars will certainly end its life in a supernova?
  2. the Sun
  3. a red giant star
  4. a 10-solar-mass star
  5. a neutron star

2 points  

QUESTION 20

  1. Why is iron significant to understanding how a supernova occurs?
  2. Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made.
  3. Supernovae often leave behind neutron stars, which are made mostly of iron.
  4. The fusion of iron into uranium is the reaction that drives a supernova explosion.
  5. Iron cannot release energy either by fission or fusion.

2 points  

QUESTION 21

  1. How are low-mass red giant stars important to our existence?
  2. These stars manufactured virtually all the elements out of which we and our planet are made.
  3. These stars generate the energy that makes life on Earth possible.
  4. These stars manufactured most of the carbon atoms in our bodies.
  5. These stars provide most of the light that reaches us from globular clusters.

2 points  

QUESTION 22

  1. The more massive a white dwarf, the
  2. higher its temperature.
  3. smaller its radius.
  4. larger its radius.
  5. higher its luminosity.

2 points  

QUESTION 23

  1. What is the ultimate fate of an isolated white dwarf?
  2. It will cool down and become a cold black dwarf.
  3. As gravity overwhelms the electron degeneracy pressure, it will explode as a nova.
  4. As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova.
  5. As gravity overwhelms the electron degeneracy pressure, it will become a neutron star.

2 points  

QUESTION 24

  1. Will our Sun ever undergo a white dwarf supernova explosion? Why or why not?
  2. Yes, right at the end of its double-shell burning stage of life.
  3. Yes, about a million years after it becomes a white dwarf.
  4. No, because it is not orbited by another star.
  5. No, because the Sun's core will never be hot enough to fuse carbon and other heavier elements into iron.

2 points  

QUESTION 25

  1. Millisecond pulsars
  2. are found in globular clustershave rotation rates of a few millisecondsboth of the above are correcthave not been found

2 points  

QUESTION 26

  1. A typical neutron star would be the size of
  2. the Sun
  3. Betelgeuse
  4. Jupiter
  5. Dallas

2 points  

QUESTION 27

  1. Very energetic flashes of gamma rays are called gamma ray bursts. The source of the gamma ray bursts
  2. are relatively close to us as the energy is so strong
  3. are at distances outside our galaxy
  4. have distances that are not possible to measure at present
  5. do not have any optical components

2 points  

QUESTION 28

  1. If you had something the size of a sugar cube that was made of neutron star matter, it would weigh
  2. about 50 pounds.
  3. as much as the entire Earth.
  4. about as much as a truck.
  5. about as much as a large mountain.

2 points  

QUESTION 29

  1. What are X-ray bursters?
  2. They are stars that explode as supernovae
  3. They are rapidly rotating black holes
  4. They are violent energy sources at the heart of the Milky Way galaxy
  5. They are neutron stars on which accreted matter builds up, then explodes in a violent nuclear explosion.

2 points  

QUESTION 30

  1. A singularity is the region
  2. where the black hole is locatedsurrounding a neutron starwhere mass increase occurswhere light travels fastest

2 points  

QUESTION 31

  1. Black holes can be detected by the presence of
  2. neutrinosX-raysradio wavesall are correct

2 points  

QUESTION 32

  1. The Schwarzschild radius of a black hole depends on
  2. the observationally measured radius of the black hole.
  3. the way in which the black hole formed.
  4. only the mass of the black hole.
  5. both the mass and chemical composition of the black hole.

2 points  

QUESTION 33

  1. The Sun will end its life as a
  2. Black holeneutron starRed giantwhite dwarf

2 points  

QUESTION 34

  1. What is the basic definition of a black hole?
  2. any compact mass that emits no light
  3. a dead star that has faded from view
  4. any object from which the escape velocity exceeds the speed of light
  5. any object made from dark matter

2 points  

QUESTION 35

  1. Light curves for type I and type II supernova are identical.
  2.  True
  3.  False

2 points  

QUESTION 36

  1. The helium flash only occurs in low-mass stars.
  2.  True
  3.  False

2 points  

QUESTION 37

  1. As a star evolves away from the main sequence, its photosphere gets hotter.
  2.  True
  3.  False

2 points  

QUESTION 38

  1. The Pleaides is an example of a reflection nebula.
  2.  True
  3.  False

2 points  

QUESTION 39

  1. The sun will get brighter as it runs out of fuel in its core.
  2.  True
  3.  False

2 points  

QUESTION 40

  1. Stars can evolve along the main sequence, so an M star becomes a B star eventually.
  2.  True
  3.  False

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Subject: Physics, Science

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