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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.

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 _______.

  pressure 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 rise above 0o

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

  Half-n-half Clue
 

2.

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 liquid in the time interval from _______.

  2 to 8 minutes

  0 to 2 minutes

  8 to 12 minutes

  Half-n-half Clue
 

3.

Burns are more injurious when caused by steam than when caused by boiling water.

  True

  False

 

4.

With _______ in pressure, water boils above 100oC.

  an increase

  a decrease

 

5.

An increase in pressure results in an increase in the freezing point of a substance.

  True

  False

 

6.

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

  vaporization

  fusion

  solidification

  liquefaction

  Half-n-half Clue
 

7.

The freezing point of salt water is less than 0oC.

  True

  False

 


 
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