Exploring the Cosmos - Degree Exam 2013 - Life and Death of Stars (Part 1)
1. Stars in the Milky Way
orbit around the Galactic centre.
orbit around the Sun.
are fixed.
move randomly.
2. The annual movement of the stars across the sky as seen from Earth and corrected for parallax is known as
annual motion.
apparent motion.
proper motion.
regular motion.
3. The region of the Sun where most of its visible radiation is released is called
the visible region.
the radiative zone.
the photosphere.
the heliosphere.
4. Stars produce energy during most of their lifetime by
breaking heavy nuclei.
gravitational contraction.
nuclear fission.
fusing light nuclei.
5. Neutron capture is a process in which
photons are scattered by neutrons.
free neutrons are captured by nuclei.
bound neutrons in heavy nuclei are captured by surrounding nuclei.
neutron stars are formed.
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
younger than those which appear blue.
older than those which appear blue.
cooler than those which appear blue.
hotter than those which appear blue.
8. The apparent brightness of a star is
proportional to its luminosity and proportional to the square of its distance from the observer.
inversely 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
the relative sizes of the stars.
the relative emissions of the stars in the V and B bands.
the proper motion of the stars.
a periodically variable Doppler shift in the observed spectrum.
10. The lifetime of a massive star
is shorter than that of a less massive star.
is longer than that of a less massive star.
cannot be compared to that of a less massive star.
is the same as that of a less massive star.
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