Exploring the Cosmos - Class Test 3 - Particles, Forces & the Big Bang
1. Your mass mainly arises from the interactions of
the strong force.
electromagnetism.
the Higgs boson.
gravity.
2. Einstein’s Theory of General Relativity is a
the quantum theory of space-time.
a description of photon interactions.
theory of gravity.
the origin of the Cosmic Microwave Background.
3. A unified theory of physics at the Planck scale is known as
Quintessence.
a Grand Unified Theory.
an Ultimate Theory.
a Theory of Everything.
4. The Cosmic Microwave Background is due to
photons emitted from the Surface of Last Scattering.
electrons emitted from the Surface of Last Scattering.
photons emitted by Dark Matter.
the scattering of Cosmic Rays.
5. The energy density of the universe is dominated by
atoms.
the Higgs Boson.
Dark Matter.
Dark Energy.
6. Which of the following is NOT evidence for Dark Matter?
The Cosmic Microwave Background.
The baryon asymmetry of the universe.
Large Scale Structure Formation.
The Lyman-alpha forest.
7. The Heat Death of the universe would be caused by
gravitational waves.
a metastable vacuum.
Dark Matter.
increasing entropy.
8. In the future the universe will
evolve in a way that is impossible to predict without understanding Dark Energy.
continue to expand at an ever increasing rate.
continue to expand but at an ever decreasing rate.
collapse to a Big Crunch.
9. CP Violation is the term used to describe
an asymmetry between the laws of physics for matter and anti-matter.
the irregularities in the Cosmic Microwave Background.
the lack of magnetic monopoles in the universe.
the decay of a Dark Matter particle.
10. The spatial geometry of a universe with critical density (Ω=1) is
cylindrical.
shaped like a saddle.
curled up like a ball.
flat.
11. Which of the following observations is evidence of the presence of dark matter?
Distant supernovae appear dimmer.
Galaxies are spinning faster than expected.
Some stars appear to be moving towards us.
Distant galaxies are moving faster away from us.
12. The red shift of light from very distant galaxies shows they are
formed a long time ago compared to nearby galaxies.
moving toward us.
very far away.
accelerating away from us.
13. The flatness problem is concerned with the following question:
Why is there more matter than antimatter in the universe?
Why is the density of the universe as close to the critical density as it is?
Why is there a microwave background?
Why is the universe expanding?
14. "Inflation" in cosmology refers to
the process by which matter clusters gravitationally to form galaxies.
the unending expansion of an open universe.
an era in the early Universe when the whole Universe suddenly expanded extremely rapidly.
the expansion of the Universe that began with the Big Bang and continues today.
15. The currently most viable dark matter candidate is
Brown dwarf stars
neutrinos
Interstellar dust
weakly interacting massive particles
16. Dark matter (excluding dark energy) is close to what percent of the total mass of the universe?
75%
20%
5%
100%
17. "The Big Freeze" is
the cold of space in the interstellar void.
the ultimate fate of a universe that expands forever.
what happens to a low mass star at the end of its life.
the Big Bang happening in reverse.
18. "Cosmic inflation" refers to
the very early universe undergoing a sudden and massive expansion.
the increase of the wavelength of light as we look deeper into space.
the increase in temperature as we approach, backward in time, the Big Bang.
the fact that the expansion of the universe seems to be accelerating.
19. The "smoothness problem" refers to the fact that
overall variation of the microwave background radiation is very small.
galaxies are moving away from us in all directions.
the geometry of the universe is very close to being flat.
the rotation curves for spiral galaxies have a smooth tail far beyond the edge of the luminous region.
20. The flatness problem is concerned with the following question:
Why is there a microwave background?
Why is the universe expanding?
Why is the density of the universe as close to the critical density as it is?
Why is there more matter than antimatter in the universe?
21. Large-scale structure is
spectral lines seen in the light from galaxies in the Local Group.
the structure of the galactic halo.
the clumping of galaxies into sheets spanning hundreds of millions of light-years.
the main piece of evidence that the universe is close to critical density.
22. The Observable Universe refers to the portion of the Universe
able to be resolved by the most powerful telescope.
from which light has had time to reach the Earth.
visible to an observer on the surface of the Earth.
that is made up of ordinary matter.
23. The 'structure problem' is best described as
the fact that the universe is surprisingly close to critical density
the fact that matter is clumped into galaxies
the lack of variation in the cosmic microwave background
the fact that the universe is expanding at the same rate in all directions
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