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.
Bok globules often emit infrared radiation.
Emission nebulae appear blue.
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
produces water vapour in interstellar space.
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.
4. The Sun generates heat by converting
hydrogen to helium through the proton-proton chain.
helium to carbon through the triple alpha reaction.
helium to carbon through the CNO cycle.
hydrogen to helium through the triple alpha reaction.
5. When the Sun becomes a Red Giant
hydrogen fusion in its core will have ceased.
its surface will become hotter than it is now.
it will eventually become a supernova.
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.
are both standard candles.
can reoccur.
7. White dwarfs are
the remains of stars much less massive than the Sun.
low magnitude stars.
very small in number.
very hot.
8. Neutrinos are
dangerous to human health.
particles of about the same mass as protons.
produced in the centre of stars.
derived from Neutrons.
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
radius of the observable Universe.
maximum size of a white dwarf.
size of a neutron star.
size of a black hole.
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