AST201 2022W Practice final
1. If the jet of a neutron star is not aligned with the spin axis, and the jet is not
pointed towards Earth, is the neutron star a pulsar?
A. YES
B. NO

2. Do high mass stars fuse iron?
A. Yes, and the fusion of iron creates so much energy, the star explodes as a
supernova
B. No, because fusion of iron does not create energy
C. No, because both the fusion and fission of iron creates energy, so it cancels out
D. Yes, because high mass stars can fuse all elements

3. You want to observe a particular area of the Milky Way, but a dust cloud is
blocking your view. What should you do?
A. Wait for the dust cloud to move
B. Observe with a optical/visual light telescope
C. Observe with an ultraviolet telescope
D. Observe with an infrared telescope

4. What is the most likely fate of our universe?
A. 6WRSVH[SDQGLQJEXWGRHVQ¶WFROODSVH
B. .HHSVH[SDQGLQJDWDQDFFHOHUDWLQJUDWH³%LJ5LS´
C. &ROODSVHVLQRQLWVHOI³%LJ&UXQFK´
D. Keeps expanding at a constant rate

5. :K\GRZHVD\WKDWJDOD[LHVLQWKH/RFDO*URXSGRQ¶WREH\WKH+XEEOH¶VODZ"
A. Because they move randomly across the Universe
B. Because the local dynamics are more significant than the expansion of the Universe
C. Because Andromeda is moving away from the Milky Way
D. %HFDXVHWKH\GRQ¶WVHHPWRPRYH
E. Because they all have the same redshift

6. Let's say we have recently discovered a large galaxy cluster. Some astronomers
are particularly interested in studying the spiral galaxies within this cluster. What
region of the cluster are they most likely to find spiral galaxies?
A. The edges
B. Halfway between the centre and the edges
C. The centre
D. Anywhere. The spiral and elliptical galaxies will be evenly distributed throughout the
cluster

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A
B
D
B
B
A
7. Consider the evolution of a massive star around 20 solar masses. At which stages
is the core contracting? (Multi)
A. Once the core is made of iron
B. During hydrogen shell burning
C. After the helium flash
D. On the main sequence

8. Which of the following statements about cosmological inflation are correct?
(Multi)
A. Inflation ended after the Universe tripled in size
B. Inflation explains the flatness problem
C. Inflation started when the Universe was only one minute old
D. The Universe was in causal contact before inflation

9. What is a galaxy rotation curve?
A. A plot of the density of stars in that galaxy versus the radial distance from the sun.
B. A plot of the orbital speeds of stars or gas in that galaxy versus their radial distance
from the sun.
C. A plot of the density of stars in that galaxy versus the radial distance from the galaxy
centre.
D. A plot of the orbital speeds of stars or gas in that galaxy versus their radial distance
from the galaxy centre.

10. Where is the center of the universe?
A. Near a super massive black hole
B. Wherever you are
C. At the Great Attractor
D. There is no centre
E. In a singularity

11. Which of the statements below are correct pieces of evidence for the Big Bang?
A. More distant galaxies are less redshifted
B. We observe the predicted ratio of light elements in the universe
C. The Cosmic Microwave Background had the predicted spectrum when observed
D. B & C
E. All of the above

12. While the Sun is a Red Giant, gravitational collapse is balanced by?
A. Helium shell burning
B. Hydrogen core burning
C. Hydrogen shell burning
D. Helium core burning
E. Carbon core burning

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A - B
B . D
D
:
C
13. Which of the following is evidence for dark energy:
A. Flat galaxy rotation curves
B. Measurements of distances and redshifts of Type Ia supernovae
C. Measurements of the size and brightness of blobs in the Cosmic Microwave
Background
D. A & B
E. There is no evidence for dark energy

14. A typical neutron star has the size of:
A. Toronto
B. Convocation Hall
C. Ontario
D. Earth
E. Sun

15. The Milky Way contains roughly how many stars?
A. 100 trillion
B. 100 million
C. 100
D. 100 thousand
E. 100 billion

16. Where are globular clusters most often found in spiral galaxies?
A. The disk
B. The bulge
C. The halo
D. None of the above
E. All of the above

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Liu
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A.CA
天
c.
㊓ⶐ枙漣
1. Our sky looks different when we observe at different wavelengths. Sort the
following images in order of longest observational wavelength to shortest.

Longest Shortest

2. Sort these cosmological periods in order of occurrence, from oldest to most
recent.
x Inflation
x Era of nucleosynthesis
x Era of particles
x Era of nuclei
x Era of atoms

3. The era of nucleosynthesis was responsible for turning Hydrogen into heavier
elements. Order these elements from most-abundant to least-abundant at the end
of this era.
(Hydrogen helium Carbon Lithium)
#1 Most abundant
#2
#3
#4 Least abundant

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C B A ⼝
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Hydrogenueliumlithiuw.eu
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❬䥻枙漣
Select the correct dropdowns to accurately describe the distance ladder.
We use [ radar/cepheid/parallax ] to determine the distance from the Earth to the Sun.
Then, with parallax, we can determine the distances to [ Nearby stars/Nearby galaxies/Distant
galaxies].
We can compare the [ Main sequence/white dwarfs/ages] of nearby and distant star clusters to
determine the distance to the further one.
Using a combination of these methods to measure the distance to a Cepheid variable star, we
can convert its apparent brightness to [ Period/luminosity/age ].
Using the Cepheid relation between period and luminosity, we can measure the distance to
nearby galaxies and calibrate [ white dwarf supernovae/core-collapse supernovae/planetary
nebulae] as a 'standard candle.' These allow us to measure the distance to
[ distant/merging/Local Group ] galaxies. _
Liu
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