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Energy

Practice Test
      
  1.The __________ is the SI unit of energy.  
  a.   volt  
  b.   watt  
  c.   ampere  
  d.   joule  
  Hint    
      
  2.As energy transformations occur within a system, the total energy of the system __________.  
  a.   decreases  
  b.   remains constant  
  c.   is transferred out of the system  
  d.   increases  
  Hint    
      
  3.What two factors determine how much kinetic energy an object has?  
  a.   speed and mass  
  b.   speed and position  
  c.   position and mass  
  d.   speed and surface area  
  Hint    
      
  4.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   400 J  
  c.   4 J  
  d.   40 J  
  Hint    
      
  5.What is a joule?  
  a.   a unit of energy that depends on both an object's mass and velocity  
  b.   the unit of measurement describing the change in velocity in a unit time  
  c.   a unit measuring the amount of energy we get from various foods  
  d.   the unit of force required to move 1 kg of mass 1 m/s/s  
  Hint    
      
  6.The law of conservation of energy states that __________.  
  a.   energy is not created or destroyed and its form is constant  
  b.   when energy is transformed, the total energy of a system is less than it was before the change  
  c.   energy cannot be created or destroyed  
  d.   energy can be created and destroyed but cannot change form  
  Hint    
      
  7.Energy stored in chemical bonds is __________.  
  a.   chemical potential energy  
  b.   chemical kinetic energy  
  c.   energy of activation  
  d.   thermal potential energy  
  Hint    
      
  8.__________ is the energy stored in an object due to its position.  
  a.   Entropy  
  b.   Thermal energy  
  c.   Kinetic energy  
  d.   Potential energy  
  Hint    
      
  9.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   quadruple  
  b.   not affect  
  c.   triple  
  d.   double  
  Hint    
      
  10.Which of the following vehicles has the most kinetic energy?  
  a.   a 300-kg motorcycle traveling 100 km/h  
  b.   a 900-kg car traveling 80 km/h  
  c.   a 2000-kg truck traveling 50 km/h  
  d.   a 1,100-kg car traveling 60 km/h  
  Hint    
      
  11.__________ is energy stored by things that stretch or compress.  
  a.   Gravitational potential  
  b.   Elastic kinetic energy  
  c.   Elastic potential energy  
  d.   Chemical kinetic energy  
  Hint    
      
  12.Which of the following is NOT a form of energy?  
  a.   chemical  
  b.   friction  
  c.   thermal  
  d.   electrical  
  Hint    
      
  13.Which of the following statements about an apple falling from a tree is true?  
  a.   Its kinetic energy decreases and its potential energy increases.  
  b.   Its kinetic and potential energies remain constant.  
  c.   Its potential energy decreases and its kinetic energy increases.  
  d.   Its mechanical energy increases.  
  Hint    
      
  14.By what process does the Sun produce enough energy to warm Earth?  
  a.   catabolism  
  b.   nuclear fusion  
  c.   transformation of thermal energy into kinetic energy  
  d.   glycolysis  
  Hint    
      
  15.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   400  
  b.   4  
  c.   14  
  d.   40  
  Hint    
      
  16.Which of the following objects has kinetic energy?  
  a.   a bicycle parked at the top of a hill  
  b.   leaves lying on the ground beneath a tree  
  c.   a ball rolling across the floor  
  d.   a sunny windowsill  
  Hint    
      
  17.Which of the following objects has potential energy?  
  a.   a ball rolling across the floor  
  b.   a bowling ball knocking over a pin  
  c.   a glass sitting on a table  
  d.   a bicycle coasting down a hill  
  Hint    
      
  18.__________ is the ability to cause change.  
  a.   Momentum  
  b.   Energy  
  c.   Power  
  d.   Work  
  Hint    
      
  19.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it leaves the bat  
  b.   when the mechanical and kinetic energies of the baseball are equal  
  c.   when it reaches its highest point  
  d.   when it hits the ground  
  Hint    
      
  20.What two factors determine how much potential energy an object has?  
  a.   speed and surface area  
  b.   speed and position  
  c.   speed and mass  
  d.   mass and position  
  Hint    

 
   
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