Exploring the Cosmos - Class Test 3 - Life and Death of Stars (Part 2)
1. The Crab Nebula is of interest because it
is in the centre of the constellation Cancer.
surrounds the supernova SN1987A.
contains a black hole.
contains a pulsar.
2. A globular cluster in our Galaxy is
a group of very young stars.
a constellation such as Orion.
an asterism like the Pleiades.
a group of very old stars.
3. Type I and II supernovae
can reoccur.
are both standard candles.
will occur in stars more massive than the Sun.
will occur in stars less massive than the Sun.
4. The main sequence is
a line on a graph of luminosity against temperature.
a nuclear reaction in very hot stars.
the succession of stages in the life of a star.
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5. An open cluster in our Galaxy is
most likely to be found in the galactic halo.
a group of newly formed stars.
a group like the Pleiades.
a constellation such as Orion.
6. White dwarfs
are low magnitude stars.
are very small in number.
are the remains of stars much less massive than the Sun.
are very hot.
7. Hydrogen burning in stars
is a reaction in which hydrogen fuses with oxygen.
is a nuclear reaction only occurring in the hottest stars.
produces water vapour in interstellar space.
can occur in the proton-proton chain reaction.
8. One element not expected to be produced in the core of stars is
gold.
carbon.
helium.
silicon.
9. Gas clouds contract to form stars because of
electrical attraction.
internal pressure.
gravity.
nuclear forces.
10. Stars in a single cluster differ widely in
age.
distance.
chemical composition.
mass.
11. Which of the following elements is not expected to be common in the core of a white dwarf?
Silicon
Oxygen
Hydrogen
Carbon
12. The CNO cycle is a nuclear reaction which
occurs in stars with cores hotter than the Sun.
occurs in carbon white dwarfs.
causes the helium flash.
produces 'metals'.
13. The final state of a star depends mainly on its
degeneracy.
chemical composition.
magnitude.
mass.
14. T Tauri stars are
standard candles.
frequently strong infrared sources.
remnant cores of dead stars.
optically visible in their cocoon.
15. Given that the radius of the Sun is about 700,000 km
light takes 2 to 3 seconds to travel from the core to the photosphere.
energy from fusion appears almost instantly at the photosphere.
energy from fusion takes about 1 million years to travel this distance.
it takes a few hours for light to travel from the core to the photosphere.
16. Protostars heat up mostly due to
nuclear fission.
gravitational contraction.
radioactivity.
nuclear fusion.
17. If 4 hydrogen nuclei fuse to form a helium nucleus
the mass is conserved.
the mass drops by about 1%.
energy is absorbed.
the mass-energy increases by about 1%.
18. The Chandrasekhar limit is
the maximum radius of a red giant.
the maximum mass of a white dwarf.
around ten times the solar mass.
the radius of a black hole.
19. 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.
20. Type Ia supernovae are
have strong H lines.
caused by stars collapsing upon themselves.
are thought to be exploding white dwarfs.
very bright, newly-formed stars.
21. 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 produce iron and heavier elements in its core.
it will eventually become a supernova.
22. Which of the following elements is not expected to be common in the core of a white dwarf?
Silicon
Carbon
Hydrogen
Oxygen
23. The triple-alpha reaction is
a nuclear reaction in which helium fuses to form carbon.
an intermediate stage in the Carbon-Oxygen-Nitrogen cycle.
responsible for the formation of globular clusters.
an intermediate stage in the proton-proton chain reaction.
24. The supernova SN1987A
was at the same position as a previously catalogued star.
emitted gravitational radiation which was detected on Earth.
was seen in the nearby Andromeda galaxy.
is the most distant supernova seen until now.
25. One element not expected to be produced in the core of stars is
gold.
helium.
carbon.
silicon.
26. The supernova SN1987A
was seen in the nearby Andromeda galaxy.
was at the same position as a previously catalogued star.
is the most distant supernova seen until now.
emitted gravitational radiation which was detected on Earth.
27. The Chandrasekhar limit is
the radius of a black hole.
the maximum mass of a white dwarf.
around ten times the solar mass.
the maximum radius of a red giant.
28. Black holes
are detected as dark clouds at the centre of galaxies.
are the final stages of stars like the Sun.
cannot be directly observed.
are caused absorption of light in cold, dense nebulae.
29. The Schwarzschild radius gives
the size of a black hole.
the radius of the observable Universe.
the size of a neutron star.
the maximum size of a white dwarf.
30. Type I and II supernovae
will occur in stars less massive than the Sun.
will occur in stars more massive than the Sun.
can reoccur.
are both standard candles.
31. The Pauli Exclusion Principle explains
why neutron stars collapse.
the solar neutrino problem.
supernovae.
why white dwarfs are stable.
32. The final state of a star depends mainly on its
chemical composition.
mass.
degeneracy.
magnitude.
33. One element not expected to be produced in the core of stars is
carbon.
gold.
silicon.
helium.
34. The position of white dwarfs on a HR diagram is
to the lower left of the main sequence.
at random points on the diagram.
on the upper part of the main sequence.
to the right of the main sequence.
35. 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.
36. The CNO cycle is a nuclear reaction which
produces 'metals'.
occurs in carbon white dwarfs.
causes the helium flash.
occurs in stars with cores hotter than the Sun.
37. Black holes
are massive neutron stars.
exert a strong gravitational pull.
are also called accretion disks.
can only exist at the centres of galaxies.
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