PTYS/ASTR 206 – Section 3 – Final Exam – Assigned 5/12/09 A few guidelines: • You shouldn’t need a calculator to do any of the math here. • It will help for some questions to sketch out cartoons on scratch paper before picking answers. • Fill out the scantron form clearly, these are being electronically graded. • Remember to fill out your name (surname first) • The exam ends at 12.30pm, if you finish early please leave as quietly as possible • This is roughly divided up by lecture, but the number of questions on each topic varies. • All questions are worth equal points, but some are harder than others. ______________________________________________________________________ Lecture 2: Days, Seasons and Lunar Phases 1. Earth’s seasons are caused by: a) Earth is closer to the sun in summer than in the winter b) Earth’s tilt makes summer locations get more direct sunshine c) Earth’s rotation speeds up and slows down so that the length of day changes d) Warm air blows from the equator during the summer and cold air from the pole during the winter e) Vegetation changes cause the temperature to go up and down 2. If we look down on the Earth from above the north pole, does the planet spin? a) Earth doesn’t spin, it’s an optical illusion b) It spins clockwise c) It spins anti-clockwise d) It depends on the season e) It depends on the time of day 3. If the full Moon is at its highest point in the sky, what time is it? a) Midnight b) 6am c) Noon d) 6pm e) This could happen at any time of dayPTYS/ASTR 206 – Section 3 – Final Exam – Assigned 5/12/09 4. If you’re at the north pole and it’s spring equinox (March), the Sun is… a) Directly overhead b) On the horizon c) 23° above the horizon d) It’s permanently dark at the north pole e) It depends on the time of day Lecture 3: Orbits and Gravity 5. The Sun has about 1000 times more mass than Jupiter. Which of the following is true? a) The gravitational force on Jupiter from the Sun is 1000 times that on the Sun from Jupiter b) The gravitational force on the Sun from Jupiter is 1000 times that on Jupiter from the Sun c) Jupiter and the Sun are too far apart to exert a gravitational force on each other d) The force on the sun is zero, only Jupiter feels a gravitational force e) The force on each object is the same 6. If it’s high tide at 6pm, what is the phase of the Moon? a) Full Moon b) Half full and waxing c) Half full and waning d) Half full and either waxing or waning e) New Moon 7. All planets are flattened somewhat, i.e. their radius at their equator is different than their radius at their north or south pole. Neptune and Uranus are flattened by about 2% (i.e. their polar radii are about 2% less than their equatorial radius) while Jupiter and Saturn are more flattened, by about 7-10%. This is because… a) Jupiter and Saturn are composed of weaker materials b) Jupiter and Saturn are closer to the Sun c) Jupiter and Saturn are bigger d) Jupiter and Saturn have more numerous and larger moons e) Jupiter and Saturn spin fasterPTYS/ASTR 206 – Section 3 – Final Exam – Assigned 5/12/09 Lecture 4: Light and Heat from Planets and Stars 8. The sky looks blue because… a) Sunlight is naturally blue b) The red light is absorbed at the top of the atmosphere c) The Earth only reflects blue light, which lights up the sky d) Air molecules scatter more blue light towards the surface e) Small droplets of water in the atmosphere are colored blue 9. Arrange the following in order of decreasing wavelength x-rays, radio waves, visible light and infrared radiation. a) Infrared, radio, visible and x-rays b) Visible, x-rays, infrared and radio c) Radio, x-rays, infrared, visible d) Infrared, visible, radio, x-rays e) Radio, infrared, visible, x-rays 10. Why are sunspots dark? a) They’re hotter and emitting all their light at ultraviolet wavelengths b) They’re holes in the solar atmosphere and show deeper levels that don’t make light c) They’re high clouds over the Sun that block our view of the surface d) They’re cooler areas on the Sun’s surface that don’t emit as much light e) They’re floating solid islands of rock on the Sun’s surface Lecture 6: The Sun 11. How does the Sun produce its energy? a) The Sun is cooling off and not producing any new energy b) Burning of oil and gas c) Radioactive decay of Uranium and Potassium d) Tidal heating from Jupiter e) Fusion of hydrogen atoms into heliumPTYS/ASTR 206 – Section 3 – Final Exam – Assigned 5/12/09 Lecture 7: Craters 12. Impact craters differ from volcanic collapse craters in that… a) You’ll never find rock that has melted in an impact crater b) Impact craters have raised rims c) Impact craters don’t have raised rims d) Impact craters have flat floors e) Impact craters don’t have flat floors Lecture 8: Terrestrial planet interiors and surfaces 13. The core of the Earth is mostly… a) Iron b) Rock c) Ice d) Hydrogen and Helium e) Carbon 14. Energy is produced within the Earth mostly by… a) Burning of oil and gas b) Radioactive decay c) Nuclear fusion of Hydrogen into helium d) Tidal heating e) Solar heating 15. Why does Earth have a magnetic field and Mars does not? a) Mars has no magnetic rocks, whereas Earth does b) Earth has higher gravity c) Earth has a liquid core, whereas Mars does not d) Earth has volcanoes, whereas Mars does not e) Earth is nearer the Sun and so warmer than MarsPTYS/ASTR 206 – Section 3 – Final Exam – Assigned 5/12/09 Lecture 9: The Moon 16. What’s the leading theory for the origin of the Moon? a) A giant impact between the Earth and another planet created debris that formed the Moon. b) The Early Earth was spinning so fast that it split into two pieces c) The Moon formed elsewhere and was captured by the Earth d) The Moon and the Earth formed together e) The Moon used to be a small asteroid, but gained mass because many objects hit it 17. The dark patches on the lunar surface (Maria) are a) Blast zones from giant impacts b) Sheets of dark volcanic rock c) Holes in the crust where we can see the underlying rocks in the mantle d) Areas where liquid water has eroded the surface e) Darker because they contain fewer impact craters Lecture 10: Mercury 18. Mercury rotates three times every two orbits. If the zero longitude meridian faces the sun when Mercury is closest to the Sun (i.e. perihelion)
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