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.
is in the centre of the constellation Cancer.
surrounds the supernova SN1987A.
contains a black hole.
2. A globular cluster in our Galaxy is
a constellation such as Orion.
a group of very old stars.
an asterism like the Pleiades.
a group of very young 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.
are both standard candles.
can reoccur.
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
a constellation such as Orion.
most likely to be found in the galactic halo.
a group of newly formed stars.
a group like the Pleiades.
6. White dwarfs
are very hot.
are the remains of stars much less massive than the Sun.
are very small in number.
are low magnitude stars.
7. Hydrogen burning in stars
is a reaction in which hydrogen fuses with oxygen.
can occur in the proton-proton chain reaction.
produces water vapour in interstellar space.
is a nuclear reaction only occurring in the hottest stars.
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
internal pressure.
nuclear forces.
gravity.
electrical attraction.
10. Stars in a single cluster differ widely in
distance.
age.
mass.
chemical composition.
11. Which of the following elements is not expected to be common in the core of a white dwarf?
Silicon
Hydrogen
Carbon
Oxygen
12. The CNO cycle is a nuclear reaction which
produces 'metals'.
occurs in stars with cores hotter than the Sun.
causes the helium flash.
occurs in carbon white dwarfs.
13. The final state of a star depends mainly on its
chemical composition.
magnitude.
degeneracy.
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 takes about 1 million years to travel this distance.
energy from fusion appears almost instantly at the photosphere.
it takes a few hours for light to travel from the core to the photosphere.
16. Protostars heat up mostly due to
gravitational contraction.
nuclear fission.
nuclear fusion.
radioactivity.
17. If 4 hydrogen nuclei fuse to form a helium nucleus
the mass drops by about 1%.
energy is absorbed.
the mass is conserved.
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.
the radius of a black hole.
around ten times the solar mass.
19. Type I and II supernovae
can reoccur.
will occur in stars less massive than the Sun.
are both standard candles.
will occur in stars more massive than the Sun.
20. Type Ia supernovae are
have strong H lines.
caused by stars collapsing upon themselves.
very bright, newly-formed stars.
are thought to be exploding white dwarfs.
21. When the Sun becomes a Red Giant
it will produce iron and heavier elements in its core.
its surface will become hotter than it is now.
it will eventually become a supernova.
hydrogen fusion in its core will have ceased.
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
responsible for the formation of globular clusters.
a nuclear reaction in which helium fuses to form carbon.
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 at the same position as a previously catalogued star.
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
helium.
silicon.
carbon.
gold.
26. The supernova SN1987A
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.
emitted gravitational radiation which was detected on Earth.
27. The Chandrasekhar limit is
the maximum radius of a red giant.
the radius of a black hole.
the maximum mass of a white dwarf.
around ten times the solar mass.
28. Black holes
are detected as dark clouds at the centre of galaxies.
are caused absorption of light in cold, dense nebulae.
are the final stages of stars like the Sun.
cannot be directly observed.
29. The Schwarzschild radius gives
the size of a neutron star.
the size of a black hole.
the radius of the observable Universe.
the maximum size of a white dwarf.
30. Type I and II supernovae
are both standard candles.
will occur in stars more massive than the Sun.
can reoccur.
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
magnitude.
mass.
degeneracy.
chemical composition.
33. One element not expected to be produced in the core of stars is
gold.
carbon.
silicon.
helium.
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 lower left of the main sequence.
to the right of the main sequence.
35. When the Sun becomes a Red Giant
it will produce iron and heavier elements in its core.
its surface will become hotter than it is now.
hydrogen fusion in its core will have ceased.
it will eventually become a supernova.
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.
can only exist at the centres of galaxies.
are also called accretion disks.
Submit Quiz