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 reaction in which hydrogen fuses with oxygen.
produces water vapour in interstellar space.
is a nuclear reaction only occurring in the most massive stars.
can occur via the proton-proton chain reaction.
4. The Sun generates heat by converting
hydrogen to helium through the triple alpha reaction.
helium to carbon through the CNO cycle.
hydrogen to helium through the proton-proton chain.
helium to carbon 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
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 small in number.
the remains of stars much less massive than the Sun.
very hot.
8. Neutrinos are
produced in the centre of stars.
derived from Neutrons.
particles of about the same mass as protons.
dangerous to human health.
9. Black holes
are massive neutron stars.
are also called accretion disks.
can only exist at the centres of galaxies.
exert a strong gravitational pull.
10. The Schwarzschild radius gives the
maximum size of a white dwarf.
size of a black hole.
radius of the observable Universe.
size of a neutron star.
Submit Quiz