Astr 100 Final Exam

Topics: Star, Sun, Solar System Pages: 12 (2710 words) Published: August 26, 2013
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Type the letter that represents the best answer to each of the multiple choice questions. Answer all questions in this section. Each question is worth 1 point. This section is worth 40 points.
[1] In the scientific method, a hypothesis is _____.
A ) is a statement of fact
B ) makes a prediction that can be tested
C ) is usually proven to be correct
D ) can only be tested once
E ) all of these

[2] Which of the following can be considered a definition of "theory?" A ) A theory can be an explanation of scientific laws.
B ) A theory is an integrated explanation of numerous hypotheses, each supported by a large body of observations and experiments. C ) A theory is a condensation and simplification of many data that previously appeared unrelated. D ) A theory is a prediction for new data suggesting new relationships among a range of natural phenomena. E ) All of the above.

[3] An integrated explanation of numerous hypotheses is known as a _____.
A ) fact
B ) law
C ) control
D ) theory
E ) guess

[4] What is the correct sequence of steps in the scientific method? I. State a problem
II. Analyze and interpret data
III. Develop a hypothesis
IV. Share the results with other scientists
V. Design and perform experiment to test the hypothesis
A ) I – II - III - IV – V
B ) III – I - V – II – IV
C ) V – IV – III – II – I
D ) I – III – V – II – IV
E ) V – II – I – III – IV

[5] Ptolemy's model sought to explain retrograde motion by _____. A) adding circles to epicycle orbits
B) adding circles to elliptical orbits
C) adding epicycles to elliptical orbits
D) adding epicycles to circular orbits

[6] Which of the following is correctly ordered from shortest to longest lifetime? A) Sun, very high mass star, very low mass star
B) very low mass star, Sun, very high mass star
C) very high mass star, Sun, very low mass star
D) Sun, very low mass star, very high mass star

[7] Which of the following is correctly ordered from smallest to largest size? A) Moon, neutron star, white dwarf, galaxy
B) white dwarf, neutron star, Moon, galaxy
C) planet, neutron star, white dwarf, galaxy
D) neutron star, Moon, white dwarf, galaxy

[8] Inner planets have _____ than outer planets.
A) lower densities
B) higher densities
C) thicker atmospheres
D) higher masses

[9] A star’s energy is normally generated by ____ reactions. A) chemical
B) biological
C) fusion
D) fission

[10] Measurements indicate that a certain star has a very high intrinsic brightness (100,000 times as bright as the Sun) and yet is relatively cool (3500 K). How can this be? A) The star must be in the upper part of the main sequence.

B) The star must be very large.
C) The star must be quite small.
D) There must be an error in observation, because no star can have these properties.

[11] Population II stars ____ than population I stars.
A) have higher percentages of hydrogen and helium
B) sparkle more
C) give off more blue light.
D) are younger

[12] The average temperature at the surface of Venus is SUBSTANTIALLY greater than the average temperature at the surface of Earth because ____. A) it is closer to the Sun
B) it rotates more slowly
C) of the amount of carbon dioxide in its atmosphere
D) clouds in its atmosphere reflect sunlight back into space

[13] Which of the following is NOT explained by the Solar Nebula theory? A) common rotation of most of the planets
B) the number of moons each planet has
C) common age of Solar System objects
D) different composition of inner and outer planets

[14] Suppose that in 2012 NASA's Kepler Mission discovers a series of planets with the following characteristics moving around a star that resembles our Sun: spherical, solid surfaces; mean densities about 4 times that of H2O; radii about 4000 km; low-density atmospheres. What would these planets be classified as, in comparison to our Solar System? A) Cometary nuclei

B) Asteroids
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