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