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Stars and Galaxies

Practice Test
      
  1.Which, if any, of the three types of galaxies occur the most often?  
  a.   spiral  
  b.   They occur in equal amounts.  
  c.   irregular  
  d.   elliptical  
  Hint    
      
  2.By studying a star's spectra, scientists can determine __________ found in the star's atmosphere.  
  a.   gases  
  b.   clusters  
  c.   dust  
  d.   elements  
  Hint    
      
  3.Fusion occurs when __________ and __________ combine to make energy.  
  a.   hydrogen, oxygen  
  b.   carbon, helium  
  c.   hydrogen, helium  
  d.   carbon, oxygen  
  Hint    
      
  4.Our sun is considered a star of__________ temperature.  
  a.   cool  
  b.   medium  
  c.   hot  
  d.   low  
  Hint    
      
  5.The Moon orbits Earth and Earth orbits the Sun. What does the Sun orbit?  
  a.   the solar system  
  b.   the universe  
  c.   the Milky Way  
  d.   It doesn't orbit.  
  Hint    
      
  6.What holds planets, stars, gas, and dust together in a galaxy?  
  a.   inertia  
  b.   forces  
  c.   friction  
  d.   gravity  
  Hint    
      
  7.What does CME stand for?  
  a.   Coronal Mass Ejections  
  b.   Coronal Materials Ejections  
  c.   Coronal Mass Emissions  
  d.   Central Mass Ejections  
  Hint    
      
  8.When fusion occurs, the mass lost is converted into __________.  
  a.   energy  
  b.   mass  
  c.   matter  
  d.   liquid  
  Hint    
      
  9.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 giant  
  d.   a galaxy  
  Hint    
      
  10.Energy produced by the sun reaches the Earth through _________.  
  a.   radiation  
  b.   convection  
  c.   convection and radiation  
  d.   conduction  
  Hint    
      
  11.A binary system is composed of ___________ stars.  
  a.   four  
  b.   three  
  c.   two  
  d.   five  
  Hint    
      
  12.Circumpolar constellations __________.  
  a.   are located in a circular constellation.  
  b.   never appear around the North Pole.  
  c.   are always located above the North Pole.  
  d.   appear to circle around the North Star as the Earth rotates.  
  Hint    
      
  13.An aurora, like the aurora borealis is caused by  
  a.   CME's  
  b.   solarwind  
  c.   solar flares  
  d.   particles from solar flares  
  Hint    
      
  14.When stars are located closer to one another, their attraction to one another increases due to __________.  
  a.   gravity  
  b.   their age  
  c.   their temperature  
  d.   their weight  
  Hint    
      
  15.Astronomers use a star's __________ to determine how far it is from Earth.  
  a.   parallax  
  b.   brightness  
  c.   size  
  d.   parallel  
  Hint    
      
  16.When a star becomes a supernova its brightness __________.  
  a.   vanishes  
  b.   increases  
  c.   doesn't change  
  d.   decreases  
  Hint    
      
  17.__________ is the process that creates energy in the sun.  
  a.   Blue shift  
  b.   Parallax  
  c.   Fission  
  d.   Fusion  
  Hint    
      
  18.The __________ __________of a star is a measure of the amount of light it gives off.  
  a.   absolute magnitude  
  b.   apparent magnitude  
  c.   apparent strength  
  d.   absolute solitude  
  Hint    
      
  19.Particles that escape from the sun's __________ move through space as solar wind.  
  a.   photosphere  
  b.   chromosphere  
  c.   surface  
  d.   corona  
  Hint    
      
  20.Why are circumpolar constellations visible all year long?  
  a.   because they are the brightest stars  
  b.   because they are the closest  
  c.   All constellations are visible all year long.  
  d.   because they are located directly above the North Pole  
  Hint    

 
   
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