PTYS ASTR 206 Section 3 Mid Term Exam 1 Assigned 2 19 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 The exam ends at 1 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 1 Solar system scales 1 What is an astronomical unit a The age of the solar system b The diameter of the Sun c The unit that astronomers use to measure mass d The distance between the Earth and the Sun e The distance between the Earth and the Moon 2 Astronomers measure temperature in Kelvin Room temperature is close to a 3 K b 30 K c 300 K d 3000 K e 30 000 K 3 How old is the solar system a 16 500 years b 6 5 million years c 250 billion years d 150 million years e 4 5 billion years 4 Arrange the following is decreasing order of size Earth Moon and the Sun a Sun Earth Moon b Sun is largest Earth and Moon are smaller and the same size c They re all the same size d Earth is largest sun and Moon are smaller and the same size e Moon Sun Earth PTYS ASTR 206 Section 3 Mid Term Exam 1 Assigned 2 19 09 Lecture 2 Days Seasons and Lunar Phases 5 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 6 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 7 When Venus looks nearly fully illuminated from the Earth it is a Closer than when it looks nearly fully shadowed b Further away than when it looks nearly fully shadowed c The same distance away as when it looks nearly fully shadowed d Can be nearer or further depending on where the other planets are e Venus always looks fully illuminated 8 The Moon always points the same face towards the Earth because a When the other face points towards the Earth then it s in darkness b When the other face points towards the Earth then the Moon is too far away to see c The Moon spins once a day so that it looks the same every night d It doesn t spin e It spins once per orbit 9 For a solar eclipse to occur a The Moon must be full b The Moon must be at its closest point to the Earth c It must be spring equinox d It must be a new Moon e More than one of the above 10 When there is a lunar eclipse then the Moon appears red because a The Earth emits so much red light that it reflects off the Moon b The Moon naturally glows red but we usually can t see it c Red sunlight passes through Earth s atmosphere most effectively d It s an optical illusion The Moon is really no redder than usual e It reflects starlight from nearby low mass red stars PTYS ASTR 206 Section 3 Mid Term Exam 1 Assigned 2 19 09 11 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 day 12 If you re at the equator and the sun is directly overhead then what season is it a December b June c March d Could be either March or September e Could be either June or December 13 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 14 Europa and Io are two moons of Jupiter Europa is smaller and farther from Jupiter than Io Which of the following is true a Europa takes less time to orbit Jupiter than Io because it s smaller b Europa takes more time to orbit Jupiter than Io because it s smaller c Europa takes less time to orbit Jupiter than Io because it s further away d Europa takes more time to orbit Jupiter than Io because it s further away e They take the same amount of time to orbit Jupiter 15 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 PTYS ASTR 206 Section 3 Mid Term Exam 1 Assigned 2 19 09 16 An astronaut has a mass of 120 kg on the Earth complete with suit backpack etc Gravity on the Moon is six times lower than on the Earth What is the astronaut s mass on the Moon a It s still 120 Kg b It s six times less i e 20kg c It s six times more i e 720 Kg d The astronaut has no mass when on the Moon e It depends on how close the Moon is to the Earth 17 The Moon and Sun raise tides on the Earth but the Moon is more important Each point on the Earth has high tide caused by the Moon a Once per day due to the Earth s rotation b Twice per day due to the Earth s rotation c Once per month due to the Moon s orbit d Twice per month due to the Moon s orbit e Once per year due to the Earth s orbit around the Sun 18 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 …
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