S2U2 Test

What is the thermal energy of an object?

• its total temperature

  
  

• the total potential energy of its particles

  
  

• the total kinetic energy of its particles

  
  

• the total kinetic and potential energies of its particles

  
  

Which statement is not necessarily true for two objects in thermal equilibrium?

• The objects are made of tiny particles that are moving at the same rate.

  
  

• The objects have the same temperature.

  
  

• The objects' temperatures have both changed by the same amount.

  
  

• The objects' temperatures are not changing.

  
  

Why does an ice cube melt when held in a hand?

• Heat is transferred from the hand to the ice cube.

  
  

• Heat from the ice cube is transferred to the hand.

  
  

• The ice cube radiates heat to the hand.

  
  

• The hand transfers temperature to the ice cube.

  
  

What is the relationship between the kinetic energy of molecules in an object and the object's temperature?

• As the temperature increases, the kinetic energy of the molecules increases.

  
  

• The total kinetic energy of the molecules is not affected by a change in temperature.

  
  

• As the kinetic energy of the molecules decreases, the temperature increases.

  
  

• The kinetic energy always increases whether the temperature increases or decreases.

  
  

What indicates that two objects are in thermal equilibrium?

• The objects are the same size.

  
  

• The objects have the same temperature.

  
  

• The objects are touching each other.

  
  

• The objects' temperatures are changing.

  
  

Which statement is true for two pieces of iron at the same temperature?

• The average kinetic energy of their particles is the same.

  
  

• The total kinetic energy of their particles is equal.

  
  

• Heat flows from the larger object to the smaller object.

  
  

• Heat flows from the object with higher potential energy to the object with lower potential energy.

  
  

What happens when the temperature of an object increases?

• The object's particles move closer together.

  
  

• The object's particles move faster.

  
  

• The number of the object's particles increases.

  
  

• The object's particles stop moving.

  
  

What happens when the temperature of an object decreases?

• The object's particles move farther apart.

  
  

• The object's particles move slower.

  
  

• The number of the object's particles decreases.

  
  

• The object's particles stop moving.

  
  

Which three temperature readings all mean the same thing?

• 100 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit

  
  

• 373 Kelvin, 100 degrees Celsius, 273 degrees Fahrenheit

  
  

• 273 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit

  
  

• 273 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit

  
  

Which three temperature readings all mean the same thing?

• 100 Kelvin, 0 degrees Celsius, 32 degrees Fahrenheit

  
  

• 373 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit

  
  

• 273 Kelvin, 0 degrees Celsius, 212 degrees Fahrenheit

  
  

• 273 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit