General Astronomy (general-astronomy.blogspot.com)🌑🌒🌓🌔🌕🌖🌗🌘🌑: Practice Astronomy Exam

Monday, March 30, 2015

Practice Astronomy Exam

1. How many times atmospheric pressure on Venus is greater than on the Earth?
a) 2; b) 9; c) 20; d) 90; e) 200.

2. Which terrestrial planet has greatest surface gravity?
a) Mercury; b) Venus; c) Earth; d) Mars; e) Moon.

3. Which terrestrial planet has longest solar day?
a) Mercury; b) Venus; c) Earth; d) Mars; e) Moon.

4. Which terrestrial planet has hottest surface temperature?
a) Mercury; b) Venus; c) Earth; d) Mars; e) Moon.

5. Which terrestrial planet is in retrograde rotation?
a) Mercury; b) Venus; c) Earth; d) Mars; e) Moon.

6. How many Mercury's solar days are in one Mercury's solar year?
a) 0.5; b) 5; c) 50; d) 500; e) 365.

7. Which terrestrial planet has the largest volcano known in the solar system?
a) Mercury; b) Venus; c) Earth; d) Mars; e) Moon.

8. Which planet of the solar system is largest?
a) Venus; b) Earth; c) Mars; d) Jupiter; e) Saturn.

9. Which planet of the solar system has lowest average density?
a) Venus; b) Earth; c) Mars; d) Jupiter; e) Saturn.

10. Which planet of the solar system has shortest solar day?
a) Venus; b) Earth; c) Mars; d) Jupiter; e) Saturn.

11. Which part of the Sun emits the radiation we see?
a) Solar Wind; b) Corona; c) Transition zone; d) Chromosphere; e) Photosphere;

12. A star with a measured parallax of 0.25" lies at a distance of _____ from the Sun.
a) 25 AU; b) 25 pc; c) 4 AU; d) 4 pc; e) 3.3 light-years

13. Spectral Class of the Star Mintaca is _____.
a) A; b) B; c) G; d) K; e) O.

14. Spectral Class of the Sun is _____.
a) A; b) B; c) G; d) K; e) O.

15. Brightest Star in Earth's Night Sky is ________.
a)Rigel Kentaurus; b) Sirius; c) Lacaille 9352 ; d) Proxima Centauri; e) UV Ceti.

16. In the set of 20 brightest stars in Earth's Night Sky the closest to the Sun is _________.
a)Rigel Kentaurus; b) Sirius; c) Lacaille 9352 ; d) Proxima Centauri; e) UV Ceti.

17. In the set of the 20 nearest stars the closest to the Sun is _________.
a)Rigel Kentaurus; b) Sirius; c) Lacaille 9352 ; d) Proxima Centauri; e) UV Ceti.

18. In the set of the 20 nearest stars the star with fastest actual motion through space is _.
a)Rigel Kentaurus; b) Sirius; c) Lacaille 9352 ; d) Proxima Centauri; e) UV Ceti.

19. In the set of the 20 nearest stars the star with the greatest component of a star's velocity along the line of sight is ____.
a)Rigel Kentaurus; b) Sirius; c)Lacaille 9352 ; d) Proxima Centauri; e) UV Ceti.

20. 1 light-year / 1 AU = ? a) 1; b) 63240; c) 1000; d) 6.32x10²⁰; e) 1.58 × 10^-5.

21. M☉ / M

= ? a) 3 330.6; b) 33 306; c) 333 060; d) 3 330 600; e) 33 306 000.

22. R☉ / R

= ? a) 0.109; b) 1.09; c) 10.9; d) 109; e) 1090.

23. Mass of the star Spica / M☉ = ? a) 0.8; b) 1.0; c) 1.5; d) 3; e) 7 .

24. Light travels from the Sun to Earth in about
a) 0.8 s; b) 8 s; c) 80 s; d) 8 minutes; e) 80 minutes.

25. The Sun orbits the center of the Milky Way at a distance of approximately ??? light-years from the galactic center.
a) 2500; b) 25000; c) 250 000; d) 2 500 000; e) 25 000 000.

26. The mean distance of the Sun from the Earth is approximately ??? astronomical units.
a) 0.1; b) 1; c) 10; d) 100; e) 1000.

27. Which evidence best supports the theory that the universe began with a massive explosion? a) cosmic background radiation in space; b) parallelism of planetary axes; c) radioactive dating of Earth’s bedrock; d) life cycle of stars; e) Newton laws.

28. The diagram below represents the apparent path of the Sun as seen by an observer at 65° N on March 21.
The Sun’s position shown in the diagram was observed closest to which time of day?
a) 9 a.m.; b) 11 a.m.; c) 3 p.m.; d) 6 p.m.; e) 11 p.m.

29. Identify the color of the star Bellatrix, which has a surface temperature of approximately 20000 K.
a) red; b) yellow; c) white; d) blue; e) electric blue.

30. Identify the color of the Bernard's Star.
a) red; b) yellow; c) white; d) blue; e) electric blue.

31. Which statement best describes Earth’s approximate rates of rotation and revolution?
a) Earth’s rotation rate is 15°/hour and its revolution rate is 1°/day; c) Earth’s rotation rate is 1°/hour and its revolution rate is 15°/day; d) Earth’s rotation rate is 24°/hour and its revolution rate is 360°/day. e) Earth’s rotation rate is 36.

32. Which of the following have an icy composition?
a) stars; b) planets; c) comets; d) asteroids; e) moons.

33. Most of the mass of the Milky Way exists in the form of
a) gas; b) dust; c) dark matter; d) stars; e) planets.

34. What is currently the best way to estimate the age of the universe? a) Stars' colors;
b) Newton Laws; c) Hubble's Constant; d) Gravitational Constant; e) Milky Way

35.   What is the current best estimate of the age of the universe?
a) 14 billion years old;   b) 7 billion years old;   c) 14 million years old;
d) 7 million years old;    e) 1.4 billion years old.

36.   If the universe is homogeneous and isotropic, Hubble’s Law implies
a) Universal Expansion;    b) Universal Gravitational Constant;
c) Newton's Laws;   d) E=mc²;   e) E=kf .

37. True or False: 1) Most Galaxies are spirals like the Milky Way; 2) Most elliptical galaxies contain only young stars. a) 1-True, 2-True; b) 1-True, 2-False; c) 1-False, 2-True;
d) 1-False, 2-False; e) Not Solution.

38.   True or False: 1) Type I supernovae can be used to determine distances to galaxies, 2) Active galaxies can emit thousands of times more energy than our own galaxy.
a) 1-True, 2-True;   b) 1-True, 2-False;    c) 1-False, 2-True;
d)   1-False, 2-False;    e) Not Solution.

39. Hubble's Law states that a) The greater the distance to a galaxy, the greater the galaxy's redshift; b) The greater the distance to a galaxy, the greater the galaxy's rotation; c) The greater the distance to a galaxy, the greater the galaxy's variables; d) The greater the distance to a galaxy, the greater the galaxy's temperature; e) The greater the distance to a galaxy, the lower the galaxy's redshift;

40. Which type of galaxy is the Milky Way?
a) Elliptical; b) spiral; c) irregular; d) satellite; e) circular.

41. In which part of the Milky Way galaxy is our sun located?
a) halo; b) bulge; c) center; d) corner; e) minor spiral arm.

42. From which of the following do spiral galaxies form? a) Rapidly cooling protogalactic clouds; b) high-density protogalactic clouds; c) rapidly spinning protogalactic clouds; d) colliding/merging protogalactic clouds; e) water clouds.

43. Which layer of the sun is only seen during a total solar eclipse?
a) core; b) photosphere; c) corona; d) convective zone; e) time zone.

44. Which layer of the sun has the highest temperature?
a) core; b) photosphere; c) chromosphere; d) corona; e) spiral.

45. Why do the planets in our solar system stay in their positions?
a) The sun's radiation keeps them there; b) They travel the same distance from each other; c) The sun's gravity keeps them in place; d) Friction with the atmosphere keeps them from escaping; e) E = mc².

46. During which phase of the Moon do we see the entire lighted side of the moon? a) new Moon; b) first quarter; c) full Moon; d) waning gibbous; e) electric blue.

47. Which term do we use when we are seeing more and more of the lighted portion of the Moon each night? a) full; b) waning; c) waxing; d) new; e) spiral.

48. How long does it take the Moon to rotate on its axis? a) about 25.3 days; b) about 27.3 days; c) about 30 days; d) about 2 months; e) about 1 year.

49. When do spring tides occur? a) During a new Moon; b) during a first quarter Moon; c) during a waxing gibbous Moon; d) during a waning crescent Moon; e) during a spiral Moon.

50. What is it called when the Moon is closest to Earth in its orbit?
a) spring; b) neap; c) apogee; d) perigee; e) spiral.