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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

Your Performance  

1.

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

  True

  False

 

2.

When a body gains heat, there is always a rise in its temperature.

  True

  False

 

3.

If 1625 J of energy are expended to rub two ice blocks against each other and the specific latent heat of ice is 325 J/g, then the mass of the melted ice is

  5 g

  10 g

  15 g

  20 g

  Half-n-half Clue
 

4.

Snow is formed due to a change of state from liquid to solid.

  True

  False

 

5.

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 _______.

  8 to 12 minutes

  0 to 2 minutes

  2 to 8 minutes

  Half-n-half Clue
 

6.

Fusion point and _______ occur at the same temperature.

  boiling point

  fusion point

  solidification point

  vaporizaton point

  Half-n-half Clue
 

7.

Vaporization point and _______ have the same numerical value.

  fusion point

  melting point

  solidification point

  liquefaction point

  Half-n-half Clue
 


 
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