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Energy

Practice Test
      
  1.The __________ is the SI unit of energy.  
  a.   ampere  
  b.   watt  
  c.   volt  
  d.   joule  
  Hint    
      
  2.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   friction  
  c.   electrical  
  d.   chemical  
  Hint    
      
  3.Which of the following objects has potential energy?  
  a.   a glass sitting on a table  
  b.   a bowling ball knocking over a pin  
  c.   a ball rolling across the floor  
  d.   a bicycle coasting down a hill  
  Hint    
      
  4.__________ is the ability to cause change.  
  a.   Energy  
  b.   Work  
  c.   Power  
  d.   Momentum  
  Hint    
      
  5.How much kinetic energy does a moving object have if its mass is 100 kg and it is moving at a speed of 5 meters per second?  
  a.   1,250 J  
  b.   2,500 J  
  c.   250 J  
  d.   125,000 J  
  Hint    
      
  6.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   not affect  
  b.   quadruple  
  c.   triple  
  d.   double  
  Hint    
      
  7.What two factors determine how much gravitational potential energy is in an object?  
  a.   weight 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.   shape and speed of the object  
  Hint    
      
  8.The law of conservation of energy states that __________.  
  a.   energy cannot be created or destroyed  
  b.   energy is not created or destroyed and its form is constant  
  c.   energy can be created and destroyed but cannot change form  
  d.   when energy is transformed, the total energy of a system is less than it was before the change  
  Hint    
      
  9.What is a joule?  
  a.   a unit measuring the amount of energy we get from various foods  
  b.   a unit of energy that depends on both an object's mass and velocity  
  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    
      
  10.What two factors determine how much kinetic energy an object has?  
  a.   speed and position  
  b.   speed and surface area  
  c.   speed and mass  
  d.   position and mass  
  Hint    
      
  11.Which of the following vehicles has the most kinetic energy?  
  a.   a 900-kg car traveling 80 km/h  
  b.   a 1,100-kg car traveling 60 km/h  
  c.   a 2000-kg truck traveling 50 km/h  
  d.   a 300-kg motorcycle traveling 100 km/h  
  Hint    
      
  12.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   4 J  
  c.   40 J  
  d.   400 J  
  Hint    
      
  13.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it reaches its highest point  
  b.   when the mechanical and kinetic energies of the baseball are equal  
  c.   when it hits the ground  
  d.   when it leaves the bat  
  Hint    
      
  14.Energy stored in chemical bonds is __________.  
  a.   energy of activation  
  b.   thermal potential energy  
  c.   chemical potential energy  
  d.   chemical kinetic energy  
  Hint    
      
  15.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   3,675 J  
  b.   375 J  
  c.   147 J  
  d.   15 J  
  Hint    
      
  16.As energy transformations occur within a system, the total energy of the system __________.  
  a.   is transferred out of the system  
  b.   remains constant  
  c.   increases  
  d.   decreases  
  Hint    
      
  17.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   4  
  b.   40  
  c.   400  
  d.   14  
  Hint    
      
  18.By what process does the Sun produce enough energy to warm Earth?  
  a.   glycolysis  
  b.   nuclear fusion  
  c.   transformation of thermal energy into kinetic energy  
  d.   catabolism  
  Hint    
      
  19.The total amount of potential and kinetic energy in a system is called __________.  
  a.   thermal energy  
  b.   energy maximum  
  c.   mechanical energy  
  d.   complete energy  
  Hint    
      
  20.During energy transformations, energy is never __________.  
  a.   released as heat  
  b.   used to increase an object's potential energy  
  c.   created or destroyed  
  d.   completely transformed  
  Hint    

 
   
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