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School Physics Quiz : Change of State & Latent Heat


Answer the following questions based on the change of state and latent heat.

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Multiple choice

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1.

When the cooling curve for naphthalene is plotted on a graph of temperature (in oC) vs. time (in minutes), the following three regions are observed:
in the first 2 minutes, the temperature drops from 90oC to 80oC;
in the next 6 minutes, the temperature remains constant at 80oC; and
in the last 4 minutes, the temperature falls from 80oC to 60oC.
The naphthalene is a mixture of liquid and solid in the time interval from _______.

  2 to 8 minutes

  8 to 12 minutes

  0 to 2 minutes

  Half-n-half Clue
 

2.

The heat gained or lost by a body during a change of state is referred to as _______ heat since there is no change in temperature.

  latent

  sensible

  specific

  Half-n-half Clue
 

3.

The process by which a _______ changes into its gaseous state at a certain fixed temperature by the absorption of heat is called vaporization.

  solid

  liquid

 

4.

In an experiment, a thin copper wire with weights at either end is placed on a supported block of ice. The thin wire is observed to pass through the ice. The experiment shows that an increase in _______.

  specific latent heat causes the freezing point of water to drop below 0o

  specific latent heat causes the freezing point of water to rise above 0o

  pressure causes the freezing point of water to drop below 0o

  pressure causes the freezing point of water to rise above 0o

  Half-n-half Clue
 

5.

The heat gained or lost by a body during a change of state is the product of its _______ and the specific latent heat.

  Weight

  Mass

  Volume

  Half-n-half Clue
 

6.

The process by which a solid changes into its liquid state at a certain fixed temperature by the absorption of heat is called _______.

  liquefaction

  vaporization

  solidification

  fusion

  Half-n-half Clue
 

7.

The process by which a liquid changes into its solid state at a certain fixed temperature by the _______ of heat is called solidification.

  absorption

  liberation

 


 
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