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
cluster of galaxies.
star about to collapse.
cluster of small stars
cloud of gas and dust.
3. Hydrogen burning in stars
is a reaction in which hydrogen fuses with oxygen.
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.
4. The Sun generates heat by converting
helium to carbon through the triple alpha reaction.
helium to carbon through the CNO cycle.
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 more massive than the Sun.
are both standard candles.
will occur in stars less massive than the Sun.
can reoccur.
7. White dwarfs are
very hot.
low magnitude stars.
the remains of stars much less massive than the Sun.
very small in number.
8. Neutrinos are
dangerous to human health.
produced in the centre of stars.
particles of about the same mass as protons.
derived from Neutrons.
9. Black holes
are massive neutron stars.
are also called accretion disks.
exert a strong gravitational pull.
can only exist at the centres of galaxies.
10. The Schwarzschild radius gives the
maximum size of a white dwarf.
size of a neutron star.
radius of the observable Universe.
size of a black hole.
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