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