Exploring the Cosmos - Degree Exam 2013 - Life and Death of Stars (Part 1)
1. Stars in the Milky Way
move randomly.
orbit around the Galactic centre.
are fixed.
orbit around the Sun.
2. The annual movement of the stars across the sky as seen from Earth and corrected for parallax is known as
apparent motion.
regular motion.
annual motion.
proper motion.
3. The region of the Sun where most of its visible radiation is released is called
the photosphere.
the heliosphere.
the radiative zone.
the visible region.
4. Stars produce energy during most of their lifetime by
gravitational contraction.
fusing light nuclei.
breaking heavy nuclei.
nuclear fission.
5. Neutron capture is a process in which
bound neutrons in heavy nuclei are captured by surrounding nuclei.
neutron stars are formed.
photons are scattered by neutrons.
free neutrons are captured by nuclei.
6. As the temperature of a blackbody increases, the peak of intensity occurs
none of the above: the peak of intensity is not affected by the temperature of the blackbody.
at a higher wavelength.
at a higher pressure.
at a higher frequency.
7. When comparing colours of main-sequence stars, those stars which appear red in colour are
older than those which appear blue.
cooler than those which appear blue.
hotter than those which appear blue.
younger than those which appear blue.
8. The apparent brightness of a star is
inversely proportional to its luminosity and proportional to the square of its distance from the observer.
proportional to its luminosity and proportional to the square of its distance from the observer.
proportional to its luminosity and inversely proportional to the square of its distance from the observer.
inversely proportional to its luminosity and inversely proportional to the square of its distance from the observer.
9. In a spectroscopic binary system, some information about stellar masses can be obtained by studying
a periodically variable Doppler shift in the observed spectrum.
the relative emissions of the stars in the V and B bands.
the proper motion of the stars.
the relative sizes of the stars.
10. The lifetime of a massive star
cannot be compared to that of a less massive star.
is longer than that of a less massive star.
is shorter than that of a less massive star.
is the same as that of a less massive star.
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