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Energy

Practice Test
      
  1.Energy stored in chemical bonds is __________.  
  a.   energy of activation  
  b.   thermal potential energy  
  c.   chemical potential energy  
  d.   chemical kinetic energy  
  Hint    
      
  2.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   147 J  
  b.   15 J  
  c.   375 J  
  d.   3,675 J  
  Hint    
      
  3.The total amount of potential and kinetic energy in a system is called __________.  
  a.   mechanical energy  
  b.   complete energy  
  c.   energy maximum  
  d.   thermal energy  
  Hint    
      
  4.__________ is the energy stored in an object due to its position.  
  a.   Thermal energy  
  b.   Kinetic energy  
  c.   Entropy  
  d.   Potential energy  
  Hint    
      
  5.What two factors determine how much potential energy an object has?  
  a.   speed and position  
  b.   mass and position  
  c.   speed and surface area  
  d.   speed and mass  
  Hint    
      
  6.One food Calorie is equivalent to approximately __________.  
  a.   40 J  
  b.   4 J  
  c.   4,000 J  
  d.   400 J  
  Hint    
      
  7.What two factors determine how much kinetic energy an object has?  
  a.   speed and surface area  
  b.   speed and mass  
  c.   position and mass  
  d.   speed and position  
  Hint    
      
  8.Which of the following statements about an apple falling from a tree is true?  
  a.   Its potential energy decreases and its kinetic energy increases.  
  b.   Its mechanical energy increases.  
  c.   Its kinetic energy decreases and its potential energy increases.  
  d.   Its kinetic and potential energies remain constant.  
  Hint    
      
  9.Which of the following vehicles has the most kinetic energy?  
  a.   a 2000-kg truck traveling 50 km/h  
  b.   a 300-kg motorcycle traveling 100 km/h  
  c.   a 1,100-kg car traveling 60 km/h  
  d.   a 900-kg car traveling 80 km/h  
  Hint    
      
  10.What is a joule?  
  a.   a unit of energy that depends on both an object's mass and velocity  
  b.   a unit measuring the amount of energy we get from various foods  
  c.   the unit of measurement describing the change in velocity in a unit time  
  d.   the unit of force required to move 1 kg of mass 1 m/s/s  
  Hint    
      
  11.The __________ is the SI unit of energy.  
  a.   watt  
  b.   volt  
  c.   ampere  
  d.   joule  
  Hint    
      
  12.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape and speed of the object  
  b.   weight of the object and height above the ground  
  c.   shape of the object and its position relative to the ground  
  d.   weight and speed of the object  
  Hint    
      
  13.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   4  
  b.   14  
  c.   40  
  d.   400  
  Hint    
      
  14.__________ is the ability to cause change.  
  a.   Momentum  
  b.   Energy  
  c.   Work  
  d.   Power  
  Hint    
      
  15.As energy transformations occur within a system, the total energy of the system __________.  
  a.   decreases  
  b.   remains constant  
  c.   increases  
  d.   is transferred out of the system  
  Hint    
      
  16.Which of the following objects has kinetic energy?  
  a.   a bicycle parked at the top of a hill  
  b.   a sunny windowsill  
  c.   leaves lying on the ground beneath a tree  
  d.   a ball rolling across the floor  
  Hint    
      
  17.Which of the following objects has potential energy?  
  a.   a bicycle coasting down a hill  
  b.   a ball rolling across the floor  
  c.   a bowling ball knocking over a pin  
  d.   a glass sitting on a table  
  Hint    
      
  18.The law of conservation of energy states that __________.  
  a.   energy can be created and destroyed but cannot change form  
  b.   energy cannot be created or destroyed  
  c.   when energy is transformed, the total energy of a system is less than it was before the change  
  d.   energy is not created or destroyed and its form is constant  
  Hint    
      
  19.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when the mechanical and kinetic energies of the baseball are equal  
  b.   when it leaves the bat  
  c.   when it hits the ground  
  d.   when it reaches its highest point  
  Hint    
      
  20.By what process does the Sun produce enough energy to warm Earth?  
  a.   glycolysis  
  b.   transformation of thermal energy into kinetic energy  
  c.   nuclear fusion  
  d.   catabolism  
  Hint    

 
   
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