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