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