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.
is in the centre of the constellation Cancer.
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
will occur in stars more massive than the Sun.
will occur in stars less massive than the Sun.
can reoccur.
are both standard candles.
4. The main sequence is
OBAFGKMRN.
a nuclear reaction in very hot stars.
the succession of stages in the life of a star.
a line on a graph of luminosity against temperature.
5. An open cluster in our Galaxy is
most likely to be found in the galactic halo.
a group like the Pleiades.
a constellation such as Orion.
a group of newly formed stars.
6. White dwarfs
are very hot.
are low magnitude stars.
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.
is a reaction in which hydrogen fuses with oxygen.
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.
silicon.
helium.
carbon.
9. Gas clouds contract to form stars because of
gravity.
electrical attraction.
internal pressure.
nuclear forces.
10. Stars in a single cluster differ widely in
chemical composition.
distance.
mass.
age.
11. Which of the following elements is not expected to be common in the core of a white dwarf?
Oxygen
Carbon
Hydrogen
Silicon
12. The CNO cycle is a nuclear reaction which
causes the helium flash.
occurs in stars with cores hotter than the Sun.
occurs in carbon white dwarfs.
produces 'metals'.
13. The final state of a star depends mainly on its
mass.
degeneracy.
magnitude.
chemical composition.
14. T Tauri stars are
remnant cores of dead stars.
frequently strong infrared sources.
optically visible in their cocoon.
standard candles.
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.
it takes a few hours for light 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 drops by about 1%.
the mass is conserved.
energy is absorbed.
the mass-energy increases by about 1%.
18. The Chandrasekhar limit is
around ten times the solar mass.
the maximum radius of a red giant.
the maximum mass of a white dwarf.
the radius of a black hole.
19. Type I and II supernovae
will occur in stars less massive than the Sun.
are both standard candles.
can reoccur.
will occur in stars more massive than the Sun.
20. Type Ia supernovae are
caused by stars collapsing upon themselves.
are thought to be exploding white dwarfs.
have strong H lines.
very bright, newly-formed stars.
21. 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.
22. Which of the following elements is not expected to be common in the core of a white dwarf?
Carbon
Oxygen
Hydrogen
Silicon
23. The triple-alpha reaction is
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.
a nuclear reaction in which helium fuses to form carbon.
24. The supernova SN1987A
is the most distant supernova seen until now.
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.
25. One element not expected to be produced in the core of stars is
gold.
silicon.
carbon.
helium.
26. The supernova SN1987A
emitted gravitational radiation which was detected on Earth.
is the most distant supernova seen until now.
was at the same position as a previously catalogued star.
was seen in the nearby Andromeda galaxy.
27. The Chandrasekhar limit is
the radius of a black hole.
the maximum radius of a red giant.
around ten times the solar mass.
the maximum mass of a white dwarf.
28. Black holes
are caused absorption of light in cold, dense nebulae.
are detected as dark clouds at the centre of galaxies.
cannot be directly observed.
are the final stages of stars like the Sun.
29. The Schwarzschild radius gives
the size of a black hole.
the size of a neutron star.
the maximum size of a white dwarf.
the radius of the observable Universe.
30. 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.
31. The Pauli Exclusion Principle explains
why neutron stars collapse.
supernovae.
why white dwarfs are stable.
the solar neutrino problem.
32. The final state of a star depends mainly on its
magnitude.
chemical composition.
degeneracy.
mass.
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.
to the right of the main sequence.
at random points on the diagram.
on the upper part 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.
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
occurs in carbon white dwarfs.
occurs in stars with cores hotter than the Sun.
causes the helium flash.
produces 'metals'.
37. Black holes
are also called accretion disks.
exert a strong gravitational pull.
are massive neutron stars.
can only exist at the centres of galaxies.
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