Exploring the Cosmos - Degree Exam 2011 - Particles, Forces & the Big Bang
1. Which assumption leading to Olber's paradox is known to be incorrect?
The universe is uniformly filled with stars.
The universe is eternal.
The amount of light reaching us from a star decreases as the inverse square of the distance to the star.
The universe is infinite in size.
2. Hubble’s Law states that
nothing can travel faster than the speed of light.
the speed at which a galaxy recedes from us is proportional to the distance from us.
the speed at which a galaxy recedes from us is inversely proportional to the distance from us.
the observable universe is finite in size.
3. Which of the following is not true of the Copernican system?
The sun is at the centre of the universe.
The distance between the sun and the Earth is small compared to the distance to the stars.
Mercury and Venus orbit the sun, which in turn orbits the Earth.
Retrograde motion is explained by Earth’s motion around the sun.
4. Which of the following is not true according to the theory of special relativity?
Objects are contracted in their direction of motion.
No signal can travel faster than the speed of light.
Moving clocks run faster than stationary clocks.
Motion with constant velocity is always relative.
5. A proton is comprised of
Two up quarks and a down quark.
Two down quarks and an up quark.
Two down quarks and an electron.
An electron, a muon, and a neutrino.
6. Which type of particle mediates the interaction that is responsible for holding quarks together in hadrons?
Gluon
Graviton
Neutrino
Photon
7. How old was the universe when primordial nucleosynthesis ended?
three minutes
10^-43 seconds
300 000 years
10^-10 seconds
8. Today the cosmic microwave background has a temperature of about
300 K
3000 K
3 K
0.003 K
9. Dark matter (excluding dark energy) is close to what percent of the total mass of the universe?
20 %
5 %
75 %
100 %
10. A possible scenario that can explain the smoothness and flatness problems in the universe is called
retrograde motion
inflation
special relativity
CP violation
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