Exploring the Cosmos - Degree Exam 2010 - Life and Death of Stars (Part 2)
1. Which one of the following statements is TRUE?
Reflection nebulae emit light from ionising hydrogen.
Emission nebulae appear blue.
Bok globules often emit infrared radiation.
Extinction nebulae can only be formed by black holes.
2. A nebula is a
cluster of small stars
cluster of galaxies.
star about to collapse.
cloud of gas and dust.
3. Hydrogen burning in stars
is a nuclear reaction only occurring in the most massive stars.
can occur via the proton-proton chain reaction.
produces water vapour in interstellar space.
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 proton-proton chain.
hydrogen to helium through the triple alpha reaction.
5. When the Sun becomes a Red Giant
it will eventually become a supernova.
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.
6. Type I and II supernovae
can reoccur.
will occur in stars less massive than the Sun.
are both standard candles.
will occur in stars more massive than the Sun.
7. White dwarfs are
the remains of stars much less massive than the Sun.
very small in number.
low magnitude stars.
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
exert a strong gravitational pull.
are massive neutron stars.
can only exist at the centres of galaxies.
are also called accretion disks.
10. The Schwarzschild radius gives the
size of a black hole.
maximum size of a white dwarf.
radius of the observable Universe.
size of a neutron star.
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