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