quiz 9 Astronomy

1.
	If you could find a bathtub big enough for Saturn, the planet would: Student Response Value Correct Answer A. sink due to its metallic interior. B. explode due to its liquid metallic hydrogen. C. catch fire, as liquid sodium reacts with water. D. precipitate more helium.  E. float. 100%    Score: 1/1
2.
	Saturn is noticeably oblate because Student Response Value Correct Answer A. its powerful gravity acts stronger on the closer poles than the distant equator. B. it has strong magnetic fields that deform its shape.  C. it is a fluid body that is spinning rapidly. 100%    D. it is tidally distorted by the pulls for its satellite system. E. All of the above are correct. Score: 1/1
3.
	The most abundant element in Saturn's atmosphere is Student Response Value Correct Answer  A. hydrogen. 100%    B. ammonia. C. helium. D. methane. E. nitrogen. Score: 1/1
4.
	What are Saturn's rings? Student Response Value Correct Answer A. a glowing, flat magnetospheric auroral display B. a solid thin disc of material encircling Saturn C. large rocky boulders moving in orbit around Saturn  D. small icy particles moving in orbit around Saturn 100%    E. a great disk of liquid helium Score: 1/1
5.
	What is the space probe that is currently orbiting Saturn and is responsible for numerous discoveries of storms and weather patterns in Saturn's atmosphere called? Student Response Value Correct Answer A. New Horizons. B. Galileo.  C. Cassini. 100%    D. Encke. E. Messenger. Score: 1/1
6.
	Saturn's rings are edge-on and vanish when it is at: Student Response Value Correct Answer  A. equinox. 100%    B. conjunction with the Sun. C. solstice. D. opposition. E. greatest elongation. Score: 1/1
7.
	The Roche limit is the point at which Student Response Value Correct Answer A. the internal forces that hold an object together weaken so that the object falls apart. B. the mass of an object classifies it as a moon. C. the external tidal forces on an object are strong enough to be felt by the object.  D. the external tidal forces on an object become greater than the internal forces that hold it together. 100%    E. a moon orbiting a planet experiences synchronous rotation. Score: 1/1
8.
	Shepherd satellites are defined as: Student Response Value Correct Answer A. moons that follow the exact orbit of another, larger, moon. B. a type of moon that orbits another moon.  C. moons that confine a narrow ring. 100%    D. satellites in the coma of a comet. E. moons that orbit inside the system of rings. Score: 1/1
9.
	Cassini is: Student Response Value Correct Answer A. the French astronomer who first discovered a gap in Saturn's rings. B. NASA's orbiter now taking photos of Saturn. C. a gap in the rings created by a resonance with Mimas.  D. all of the above 100%    E. none of the above Score: 1/1
10.
	How many large moons does Saturn have? Student Response Value Correct Answer A. 3  B. 1 100%    C. 2 D. 4 E. 0 Score: 1/1
11.
	What evidence suggests that Enceladus has ongoing geological activity? Student Response Value Correct Answer A. Voyager 1 showed sulfur eruptions all over its pizza-pie colored surface. B. Enceladus is located within Saturn's Roche limit, and ready to blow up.  C. Lack of impact craters on much of its surface and evidence of ice flows from possible volcanic activity. 100%    D. Enceladus undergoes severe tidal stresses from its resonance with Titan. E. Voyager 2 photographed liquid nitrogen geysers 10 kilometers tall. Score: 1/1
12.
	What is interesting about Saturn's large moon Titan? Student Response Value Correct Answer A. It orbits Saturn in a retrograde sense.  B. It has an atmosphere. 100%    C. It is one of Saturn's two large moons. D. It has its own moon. E. It has a 2:1 resonance with Mimas and a 4:1 resonance with the Cassini gap. Score: 1/1
13.
	The atmosphere of Titan is composed mostly of: Student Response Value Correct Answer A. hydrogen. B. carbon dioxide. C. oxygen. D. methane.  E. nitrogen. 100%    Score: 1/1
14.
	Which Saturnian moon has the leading hemisphere black as tar, the back side icy white? Student Response Value Correct Answer  A. Iapetus 100%    B. Rhea C. Titan D. Enceladus E. Mimas Score: 1/1
15.
	What makes Mimas a distinct moon? Student Response Value Correct Answer A. It has a rich atmosphere that may resemble that of the early Earth.  B. It suffered a huge meteorite impact that must have nearly shattered it. 100%    C. It helps maintain a wide apparent gap in Saturn's rings, known as Encke's Division. D. The leading hemisphere is very dark, while the back side is bright ice. E. It is the largest of Saturn's moons. Score: 1/1
16.
	How thick are Saturn's rings from top to bottom? Student Response Value Correct Answer  A. a few tens of meters 100%    B. a few tens of thousands of kilometers C. a few million kilometers D. a few kilometers E. a few hundred kilometers Score: 1/1
17.
	The rings of Saturn occupy the region inside Saturn's Roche limit. Student Response Value Correct Answer True 100% True Score: 1/1
18.
	Helium is more abundant at Saturn than at Jupiter. Student Response Value Correct Answer False 100% False Score: 1/1
19.
	Saturn's two shepherd moons herd the particles in the F ring. Student Response Value Correct Answer True 100% True Score: 1/1
20.
	Most of the moons of Saturn have rocky, cratered surfaces, like Deimos and Phobos. Student Response Value Correct Answer False 100% False Score: 1/1
21.
	Saturn has a surface magnetic field weaker than Earth's. Student Response Value Correct Answer True 100% True Score: 1/1
22.
	Saturn has several enduring major storm systems similar to Jupiter's Great Red Spot. Student Response Value Correct Answer True 0% False Score: 0/1