Astronomy

1.	Quiz 5-Q1
	Many of the brightest stars we see are only a few million years old. Student Response Value Correct Answer True 100% True Score: 5/5
2.	Quiz 5-Q2
	Rotation and magnetism both play key roles in protostar formation. Student Response Value Correct Answer True 100% True Score: 5/5
3.	Quiz 5-Q3
	What is the force that keeps a main sequence star from blowing apart?   Student Response Value Correct Answer Feedback 1. Magnetism      2. Gravitation 100%      3. The strong force     4. Radiation pressure     5. Electron degeneration pressure     Score: 5/5
4.	Quiz 5-Q4
	During a protostar's T Tauri phase, it   Student Response Value Correct Answer Feedback  1. begins a period of reduced activity. 0%     2. expands dramatically.     3. lies on the main sequence.     4. may develop very strong winds      5. changes its spin direction     Score: 0/5
5.	Quiz 5-Q5
	A protostar of 20 solar masses will probably turn into a type O main sequence star. Student Response Value Correct Answer False 0% True Score: 0/5
6.	Quiz 5-Q6
	Shock waves from supernovae disrupt an interstellar cloud and prevent it from forming stars. Student Response Value Correct Answer False 100% False Score: 5/5
7.	Quiz 5-Q7
	A newly formed protostar will radiate primarily at which wavelength?   Student Response Value Correct Answer Feedback 1. visible light     2. X-ray      3. infrared 100%      4. ultraviolet     5. radio     Score: 5/5
8.	Quiz 5- Q8
	How long does it take for a star like our Sun to form?   Student Response Value Correct Answer Feedback 1. 100 thousand years     2. two million years      3. fifty million years 100%      4. one billion years     5. 4.6 billion years     Score: 5/5
9.	Quiz 5- Q9
	The evolution of a protostar slows significantly as it approaches the main sequence Student Response Value Correct Answer True 100% True Score: 5/5
10.	Quiz 5- Q10
	Rotation causes the cocoon of dust to flatten into a dusty disk around protostars. Student Response Value Correct Answer True 100% True Score: 5/5
11.	Quiz 5- Q11
	Which event marks the birth of a star?   Student Response Value Correct Answer Feedback 1. formation of the planetary nebula      2. fusion of hydrogen atoms into helium atoms 100%      3. collapse of an interstellar cloud     4. formation of a photosphere     5. instability in an interstellar cloud     Score: 5/5
12.	Quiz 5- Q12
	As a star forms, the photosphere first appears:   Student Response Value Correct Answer Feedback 1. when the planetary nebula is expelled.      2. when the protostar forms. 100%      3. when contraction slows down.     4. when nuclear fires ignite.     5. when the star reaches the main sequence.     Score: 5/5
13.	Quiz 5- Q13
	On an H-R diagram, a protostar would be   Student Response Value Correct Answer Feedback  1. above and to the right of the main sequence. 100%      2. below and to the left of the main sequence.     3. below and near the right side of the main sequence.     4. above and near the upper left of the main sequence.     5. on the main sequence at the extreme lower right.     Score: 5/5
14.	Quiz 5- Q14
	Type M stars evolve to the main sequence faster than our G type Sun. Student Response Value Correct Answer False 100% False Score: 5/5
15.	Quiz 5- Q15
	Most stars are usually formed singularly or as binaries, not in clusters. Student Response Value Correct Answer False 100% False Score: 5/5
16.	Quiz 5- Q16
	A collapsing cloud fragment that will form a star of one solar mass (like our Sun) has a mass of about   Student Response Value Correct Answer Feedback 1. 2 solar masses.      2. 10 solar masses.      3. 200 solar masses. 0%     4. 10^20 solar masses.     5. 10^40 solar masses.     Score: 0/5
17.	Quiz 5- Q17
	Match the following: interstellar cloud main-sequence star protostar evolution fragmentation star   stage 2 stage 6 stage 5 stage 7 stage 1 Statement Response Value Correct Match interstellar cloud stage 1 20.0% stage 1 main-sequence star stage 7 20.0% stage 7 protostar evolution stage 5 20.0% stage 5 fragmentation stage 2 20.0% stage 2 star stage 6 20.0% stage 6 Score: 20/20