Exploring the Cosmos - Degree Exam 2010 - Life and Death of Stars (Part 2)
1. Which one of the following statements is TRUE?
Emission nebulae appear blue.
Reflection nebulae emit light from ionising hydrogen.
Bok globules often emit infrared radiation.
Extinction nebulae can only be formed by black holes.
2. A nebula is a
star about to collapse.
cloud of gas and dust.
cluster of galaxies.
cluster of small stars
3. Hydrogen burning in stars
can occur via the proton-proton chain reaction.
is a nuclear reaction only occurring in the most massive stars.
produces water vapour in interstellar space.
is a reaction in which hydrogen fuses with oxygen.
4. The Sun generates heat by converting
hydrogen to helium through the proton-proton chain.
hydrogen to helium through the triple alpha reaction.
helium to carbon through the CNO cycle.
helium to carbon through the triple alpha reaction.
5. When the Sun becomes a Red Giant
hydrogen fusion in its core will have ceased.
it will eventually become a supernova.
its surface will become hotter than it is now.
it will produce iron and heavier elements in its core.
6. Type I and II supernovae
are both standard candles.
will occur in stars less massive than the Sun.
can reoccur.
will occur in stars more massive than the Sun.
7. White dwarfs are
low magnitude stars.
very small in number.
the remains of stars much less massive than the Sun.
very hot.
8. Neutrinos are
produced in the centre of stars.
derived from Neutrons.
dangerous to human health.
particles of about the same mass as protons.
9. Black holes
are also called accretion disks.
can only exist at the centres of galaxies.
exert a strong gravitational pull.
are massive neutron stars.
10. The Schwarzschild radius gives the
radius of the observable Universe.
size of a black hole.
maximum size of a white dwarf.
size of a neutron star.
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