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