Astronomy

1.	QM14 - 1
	Not taking dark energy into account, we seem to live now in a matter dominated universe, since the observed matter density exceeds the observed energy density. Student Response Value Correct Answer True 100% True Score: 5/5
2.	QM14 - 2
	When an electron is formed from a gamma ray collision, a positron is also made. Student Response Value Correct Answer True 100% True Score: 5/5
3.	QM14 - 3
	In the GUT, gravity was the first force to take on a separate identity at the Planck Time. Student Response Value Correct Answer True 100% True Score: 5/5
4.	QM14 - 4
	Deuterium and helium could be made only during the nuclear epoch. Student Response Value Correct Answer False 100% False Score: 5/5
5.	QM14 - 5
	The horizon problem relates to the isotropy of the microwave background radiation. Student Response Value Correct Answer True 100% True Score: 5/5
6.	QM14 - 6
	When new particle pairs are being created as fast as they annihilate, it is   Student Response Value Correct Answer Feedback 1. hydrostatic equilibrium.      2. thermal equilibrium. 100%      3. the threshold equilibrium.     4. the cosmological constant.     5. the critical density.     Score: 5/5
7.	QM14 - 7
	How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?   Student Response Value Correct Answer Feedback 1. They are very close to being equal.     2. 73% cosmic background, 27% starlight.      3. About ten times more from the Big Bang than from stars and galaxies. 100%      4. The starlight now dominates the background, as your eyes show clearly.     5. We have no way of comparing matter and energy this way.     Score: 5/5
8.	QM14 - 8
	Before about 50,000 years after the Big Bang the universe was   Student Response Value Correct Answer Feedback  1. radiation dominated. 100%      2. quark dominated.     3. lepton dominated.     4. matter dominated.     5. dark energy dominated.     Score: 5/5
9.	QM14 - 9
	Collectively, electrons, muons, and neutrinos are called   Student Response Value Correct Answer Feedback 1. hadrons.     2. baryons.     3. photons.      4. leptons. 100%      5. pions.     Score: 5/5
10.	QM14 - 10
	In the Grand Unified Theory, the superforce was   Student Response Value Correct Answer Feedback 1. only dark energy.     2. a union of the weak and electromagnetic forces.     3. a union of all matter and energy.      4. a union of the gravitational, strong and weak nuclear, and electromagnetic forces. 100%      5. was only in effect at low energies.     Score: 5/5
11.	QM14 - 11
	Organic molecules can only be made by living things. Student Response Value Correct Answer True 0% False Score: 0/5
12.	QM14 - 12
	Life emerged on Earth about a billion years after the solar system formed. Student Response Value Correct Answer True 100% True Score: 5/5
13.	QM14 - 13
	NASA has found definite proof for the past existence of life on Mars. Student Response Value Correct Answer False 100% False Score: 5/5
14.	QM14 - 14
	Europa is the most promising of the bodies in the outer solar system for life in its salty seas. Student Response Value Correct Answer True 100% True Score: 5/5
15.	QM14 - 15
	The radio signals from Earth are greater than from the Sun. Student Response Value Correct Answer True 100% True Score: 5/5
16.	QM14 - 16
	As yet, no human probe has left our solar system and gone into interstellar space. Student Response Value Correct Answer True 100% True Score: 5/5
17.	QM14 - 17
	Which of the following appears most favored by natural selection?   Student Response Value Correct Answer Feedback 1. intelligence      2. opposable thumbs     3. bipedal locomotion      4. binocular vision 0%     5. live birth     Score: 0/5
18.	QM14 - 18
	What important molecules of life did Miller and Urey brew up?   Student Response Value Correct Answer Feedback 1. RNA     2. fatty acids     3. lean acids      4. amino acids 100%      5. antacids     Score: 5/5
19.	QM14 - 19
	How long ago did multicellular life forms appear in the fossil record?   Student Response Value Correct Answer Feedback 1. 4.5 billion years ago     2. 3.8 billion years ago      3. one billion years ago 100%      4. 63 million years ago     5. 30 million years ago     Score: 10/10
20.	QM14 - 20
	Recently discovered organisms that create their energy through chemical reactions (chemosynthesis instead of photosynthesis) and live in environments previously thought too alkaline, hot, cold, dark, saline, etc. to sustain life. These organisms are collectively called   Student Response Value Correct Answer Feedback 1. viruses.     2. huge crabs.     3. extremophiles.      4. hydrothermal vents.      5. giant red tube worms. 0%     Score: 0/10