Sun, Stars, HR Diagram

A) hydrogen B) heliumC) carbon D) oxygen

1. The most abundant element on the sun is

A) nuclear fission B) nuclear fusionC) combustion D) electrical generation

2. Most of the radiant energy released by the sun results from theprocess of

A) solar eclipsesB) solar flaresC) meteorites entering the atmosphereD) lunar eclipses

3. What celestial phenomenum most affects radio communication andother electrical atmospheric changes for us on earth?

A) 10 times B) 100 timesC) 1000 times D) 10,000 times

4. Approximately how many times larger is the diameter of the suncompared to the earth?

A) Proxima Centauri B) PolluxC) Rigel D) 40 Eridani B

5. Which star is cooler and less luminous than the Sun?

A) Betelgeuse and Barnard's StarB) Procyon B and Proxima CentauriC) Polaris and the SunD) Alpha Centauri and Sirius

6. Which two stars are most similar in luminosity?

A) main sequence star B) red giant starC) white dwarf star D) red dwarf star

7. The star Algol is estimated to have approximately the sameluminosity as the star Aldebaran approximately the same temperatureas the Rigel. Algol is best classified as a

A) Barnard’s Star, Polaris, Sirius, RigelB) Aldebaran, the Sun, Rigel, Procyon BC) Rigel, Polaris, Aldebaran, Barnard’s StarD) Procyon B, Alpha Centauri, Polaris, Betelgeuse

8. Which list shows stars in order of increasing temperature?

A) blue B) white C) yellow D) red

9. Which star color indicates the hottest star surface temperature?

A) among the hottest starsB) among the smallest starsC) very uniqueD) about average in all respects

10. Compared to other stars, the sun is

A) hotter and larger B) hotter and smallerC) cooler and larger D) cooler and smaller

11. Compared to the sun a white dwarf star is

A) in the Red Dwarf region.B) in the Supergiant region.C) among the White Dwarfs.D) on the Main Sequence.

12. In the H-R diagram, 90 percent of all stars fall

A) Sun B) Alpha CentauriC) Betelgeuse D) Procyon

13. Which star has the greatest size?

A) hotter and less luminousB) cooler and more luminousC) the same temperature and largerD) hotter and larger

14. Compared to the sun, Polaris is

A) the late phase for small mass starB) the remains of a larger star's explosionC) in the main sequence phaseD) early phases, soon after a star's formation

15. At which phase of its evolutionary life is a white dwarf star?

A) to expand as a red giant, undergo a nova outburst and end as awhite dwarf

B) to shrink to a white dwarf then eventually expand to a redgiant

C) become hotter and expand into a blue supergiantD) to become a black hole

16. The probable fate of our sun is

A) measure the size of a starB) measure the altitude of a starC) identify elements in the atmosphere of a starD) measure the diameter of a star

17. By using a spectroscope an astronomer can

Sun, Stars, HR Diagram

Base your answers to questions 18 through 20 on the diagram below, which shows two possible sequences in the life cycle ofstars, beginning with their formation from nebular gas clouds in space.

A) nebula B) supernova C) red giant D) black dwarf

18.Stars like Earth’s Sun most likely formed directly from a

A) explode in a supernova B) become a black holeC) change into a white dwarf D) become a neutron star

19. According to the diagram, a star like Earth’s Sun will eventually

A) mass and size B) temperature and originC) luminosity and color D) luminosity and structure

20. According to the diagram, the life-cycle path followed by a star is determined by the star’s initial

Answer KeySunStars

1. A

2. B

3. B

4. B

5. A

6. B

7. A

8. A

9. A

10. D

11. B

12. D

13. C

14. C

15. B

16. A

17. C

18. A

19. C

20. A