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