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Stars and Galaxies

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

 
   
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