Section 1 Astronomy Test-Practice

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1 Section 1 Astronomy Test-Practice Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which of these would be shorter if Earth rotated faster? a. years c. weeks b. months d. days 2. How long does Earth take to orbit once around the sun? 3. How long does Earth take to rotate once on its axis? 4. About how long does the moon take to orbit the Earth? 5. The length of a day is based on a. the Earth orbiting the sun. c. the moon orbiting the Earth. b. the rotation of the Earth on its axis. d. the rotation of the moon on its axis. 6. The longest day of the year occurs on the day of the a. vernal equinox. c. summer solstice. b. autumnal equinox. d. winter solstice. 7. One astronomical unit (AU) is a. 150 million kilometers. b. the average distance between the Earth and the sun. c. the semimajor axis of any ellipse. d. Both (a) and (b) 8. When do annular eclipses occur? a. every solar eclipse b. when the moon is closest to the Earth c. only during full moon d. when the moon is farthest from the Earth 9. What is the most current theory for the formation of Earth s moon? a. The moon formed from a collision between another body and the Earth. b. The moon was captured by the Earth. c. The moon formed at the same time as the Earth. d. The moon formed by spinning off from the Earth early in its history. 10. Which moon orbits Earth? a. Charon c. Io b. Tethys d. Luna 11. Which of the following best describes our moon? a. On Earth, we always see the same side of the moon. b. The moon's period of rotation and period of revolution are identical. c. The relative positions of the moon, sun, and Earth determine which phase the moon is in. d. All of the above

2 12. Which of the following statements is TRUE? a. During an annular eclipse, the solar corona is visible. b. A solar eclipse can be viewed from only a few locations on Earth. c. Annular eclipses occur because the moon's orbit is not completely circular. d. All of the above 13. During a lunar eclipse, the moon can look a. red. c. black. b. blue. d. green. Completion Complete each sentence or statement. 14. of the Earth causes night and day. (Rotation or Revolution) 15. The Earth completes one each day. (revolution or rotation) 16. The amount of time it takes for a single trip around the sun is called a _. 17. A planet travels around the sun in an elongated circle called an. 18. A naturally formed planetary satellite is a. (comet or moon) 19. As Earth's moon waxes, the sunlit fraction we see from Earth becomes. (larger or smaller) 20. When the moon is waning, the sunlit fraction is becoming. (larger or smaller) 21. If you lived on the far side of the moon, you would never see the. (Earth or sun) 22. The time it takes for the Earth to around the sun is one year. (rotate or revolve) 23. The spin of an object on its axis is called. 24. The motion of a body as it orbits another body is called. 25. When the moon is, the sunlit fraction seen from Earth is getting larger. 26. When the moon is, the sunlit fraction seen from Earth is getting smaller. 27. A(n) occurs when the shadow of one celestial body falls on another. 28. A eclipse occurs when the Earth comes between the sun and the moon, and the shadow of the Earth falls on the moon. 29. A eclipse occurs when the moon comes between the Earth and the sun, and the shadow of the moon falls on the Earth. Short Answer 30. Why do we always see the same side of the moon? 31. How are lunar eclipses different from solar eclipses? 32. Do solar eclipses occur at the full moon or at the new moon? Explain why. 33. Is the far side of the moon always dark? Explain your answer. 34. Describe the difference between a solar eclipse and a lunar eclipse.

3 35. Describe the current theory of how the Earth's moon formed. 36. Look at the chart below. Label each lunar phase with the correct phase name.

4 Section 1 Astronomy Test-Practice Answer Section MULTIPLE CHOICE 1. ANS: D 2. ANS: D 3. ANS: A 4. ANS: C 5. ANS: B 6. ANS: C 7. ANS: D 8. ANS: D 9. ANS: A 10. ANS: D 11. ANS: D 12. ANS: D 13. ANS: A COMPLETION 14. ANS: Rotation 15. ANS: rotation 16. ANS: period of revolution 17. ANS: ellipse 18. ANS: moon 19. ANS: larger 20. ANS: smaller 21. ANS: Earth 22. ANS: revolve 23. ANS: rotation 24. ANS: revolution 25. ANS: waxing 26. ANS: waning 27. ANS: eclipse 28. ANS: lunar 29. ANS: solar SHORT ANSWER 30. ANS: The moon's period of revolution around the Earth is the same as its period of rotation. 31. ANS: During a lunar eclipse, the Earth comes between the sun and the moon and Earth's shadow falls on the moon. During a solar eclipse, the moon comes between the Earth and the sun and the moon's shadow falls on the Earth.

5 32. ANS: Solar eclipses occur during the new moon. During the new moon, the side of the moon that faces the Earth is in darkness because the moon is between the sun and the Earth. This is the same arrangement that causes a solar eclipse. 33. ANS: No; the far side of the moon gets just as much sunlight as the near side. As the moon revolves around the Earth, it also rotates, which gives it night and day. 34. ANS: In a solar eclipse, the moon passes between the sun and the Earth, and the moon's shadow falls on the surface of the Earth. In a lunar eclipse, the Earth passes between the sun and the moon, casting a shadow on the surface of the moon. 35. ANS: The current theory states that as the Earth was still forming, a large object collided with it and broke off a piece of the Earth's mantle. This piece of the mantle combined with part of the colliding body to form the moon, which then began to orbit the Earth. 36. ANS:

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