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Stars and Galaxies

Practice Test
  1.The __________ __________ is a measure of the amount of light received on earth.  
  a.   apparent measure  
  b.   absolute measure  
  c.   absolute magnitude  
  d.   apparent magnitude  
  2.Which, if any, of the three types of galaxies occur the most often?  
  a.   elliptical  
  b.   irregular  
  c.   They occur in equal amounts.  
  d.   spiral  
  3.The Moon orbits Earth and Earth orbits the Sun. What does the Sun orbit?  
  a.   the universe  
  b.   the Milky Way  
  c.   It doesn't orbit.  
  d.   the solar system  
  4.__________ is the process that creates energy in the sun.  
  a.   Fission  
  b.   Parallax  
  c.   Blue shift  
  d.   Fusion  
  5.The __________ __________of a star is a measure of the amount of light it gives off.  
  a.   absolute solitude  
  b.   absolute magnitude  
  c.   apparent strength  
  d.   apparent magnitude  
  6.Once stars run out of hydrogen and the temperature begins to increase, these stars are said to be __________.  
  a.   a white dwarf  
  b.   a supernova  
  c.   a galaxy  
  d.   a giant  
  7.When fusion occurs, the mass lost is converted into __________.  
  a.   mass  
  b.   matter  
  c.   energy  
  d.   liquid  
  8.Astronomers use a star's __________ to determine how far it is from Earth.  
  a.   parallel  
  b.   brightness  
  c.   size  
  d.   parallax  
  9.What holds planets, stars, gas, and dust together in a galaxy?  
  a.   friction  
  b.   inertia  
  c.   forces  
  d.   gravity  
  10.Energy produced by the sun reaches the Earth through _________.  
  a.   radiation  
  b.   convection  
  c.   conduction  
  d.   convection and radiation  
  11.Fusion occurs when __________ and __________ combine to make energy.  
  a.   carbon, oxygen  
  b.   carbon, helium  
  c.   hydrogen, oxygen  
  d.   hydrogen, helium  
  12.Another way to define "nebula" is __________.  
  a.   young star  
  b.   dying star  
  c.   old star  
  d.   exploding star  
  13.An aurora, like the aurora borealis is caused by  
  a.   solarwind  
  b.   solar flares  
  c.   particles from solar flares  
  d.   CME's  
  14.The North Star,___________, is positioned almost directly over the North Pole.  
  a.   Betelgeuse  
  b.   Polaris  
  c.   Orion  
  d.   Sirius  
  15.Circumpolar constellations __________.  
  a.   are located in a circular constellation.  
  b.   are always located above the North Pole.  
  c.   appear to circle around the North Star as the Earth rotates.  
  d.   never appear around the North Pole.  
  16.When stars are located closer to one another, their attraction to one another increases due to __________.  
  a.   their temperature  
  b.   gravity  
  c.   their weight  
  d.   their age  
  17.A binary system is composed of ___________ stars.  
  a.   four  
  b.   two  
  c.   five  
  d.   three  
  18.When a star becomes a supernova its brightness __________.  
  a.   doesn't change  
  b.   vanishes  
  c.   decreases  
  d.   increases  
  19.Why are circumpolar constellations visible all year long?  
  a.   because they are the closest  
  b.   because they are the brightest stars  
  c.   All constellations are visible all year long.  
  d.   because they are located directly above the North Pole  
  20.Prominence, or huge arching columns of gas, are thought to be caused by__________.  
  a.   the rotation of the galaxy  
  b.   Earth's magnetic field  
  c.   the Sun's rotation  
  d.   the magnetic field associated with sunspots  

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