Stars to the lower left of the Hertzsprung-Russell diagram tend to be relatively
A) hot and blue.
B) long lasting.
C) huge and massive.
D) yellow and of average size.
[Ques. 2] The longest living stars are those of
A) low mass.
B) high mass.
C) intermediate mass.
[Ques. 3] Which is greater, the gravitational attraction between a newborn baby and the Earth, or the gravitational attraction between the Earth and all the planets of the solar system?
A) the attraction between the baby and Earth
B) the attraction between the planets and Earth
C) They are roughly equal.
D) The baby's and the planets gravitational attractions are inversely proportional to each other.
[Ques. 4] Red giant stars are
A) close to exhausting their supply of hydrogen.
B) have already exhausted their supply of hydrogen.
C) are close to exhausting their supply of helium.
D) have already exhausted their supply of helium.
[Ques. 5] On the H-R diagram our Sun is a
A) white dwarf.
B) star of average luminosity and temperature.
C) red supergiant.
D) relatively bright, blue star.
[Ques. 6] The temperature of a star is evidenced by its
A) brightness.
B) color.
C) angular momentum.
D) distance.
E) rate of burning.
[Ques. 7] Thermonuclear fusion occurs mainly in the
A) cores of stars.
B) outer layers of stars.
C) both, actually
[Ques. 8] The event that changes a protostar to a full-fledged star is
A) gravitational collapse.
B) gravitational expansion.
C) thermonuclear fusion.
D) the emission of light.
E) a catastrophic increase in temperature.
[Ques. 9] Which star will emit the shortest wavelength of its peak frequency?
A) a blue star
B) a yellow star
C) a red star
D) a green star
[Ques. 10] Luminosity is
A) the total amount of light energy that star emits into space.
B) the stars apparent brightness.
C) the stars particular color spectrum output.
D) the stars total infrared output.
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