1. Which of the following is a scientific law? a. Mathematical description of how far galaxies are from us and their relative space b. Force= Mass*Acceleration. c. Summary conclusion: total amount of matter and energy in the universe is crop d. All above e. Both a and b 2. (6 x 10^ 105 sec) *(4 x 10^ 10 m)/ (2 x 10^ 40 sec) a. 12 x 100^ 22 m b. 12 x 10^ 121 m c. 1.2 x 10^ 118 km d. Both b and c are correct e. Both a and c are correct 3. The earth’s radius is about 6,000 km, while its crust has a thickness of about 30 km. if the earth is scaled down to the size of a ball, with a radius of 20 cm, how thick would the crust be? a. 4mm b. 10mm c. 1cm d. 4000cm e. 0.1cm 4. Which of the graphs below shows sample measurements with high systematic error and high random error? 5. How many seconds are there in one light-year? 1 year=365 days a. This makes absolutely no sense b. 3.15 x 10^5 seconds c. 3.15 x 10^ 6 seconds d. 3.15 x 10^ 7 seconds 6. Under what circumstances would the slope of the best-fitted line in figure1 decreases: a. Distance becomes systematically underestimated b. Velocity becomes systematically overestimated c. Velocity becomes systematically underestimated d. Both a and b are correct e. Both a and c are correct 7. Using the table below regarding main sequence stars, choose The True statement below: Star Temperature (K) Distance (ly) A B 20,000 5,000 10,000 Unknown Observed Luminosity(J/S) 10^-24 10^-28 a. The absolute intensity (energy given off) of star B is greater Than that of star A b. The color of star B is bluer than A c. Star B emits radiation of a longer peak wavelength than A d. Star B is farther away from us than star A e. Star A is closer us than B 8. Given absorption spectra below, what can be inferred? a. The object is moving away from the observer and it is redshifted b. The object is moving towards the observer and it is redshifted c. The object is moving away from the observer and it is blueshifted d. The object is moving towards the observer and it is blueshifted e. Nothing can be inferred from the spectra about the direction that the object relative to the observer 9. How many electrons does an atom usually contribute to form a typical covalent bond? a. One b. Two c. Three d. Eight 10.Lines associated with the atomic spectra represent: a. Nuclear energy emitted by atoms in the cores of the stars b. Nuclear energy absorbed by the atoms in the cores of the stars c. Energy absorbed as electrons move from one atomic orbital to another d. Cosmic microwave background (CBM) radiation 11.Penicillin is a: a. Anti-bacterial fungi b. Anti-bacterial molecule c. Anti-bacterial mold d. Anti-mold bacteria e. Anti-fungi molecule
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