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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.

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 rise above 0o

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

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

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

  Half-n-half Clue
 

2.

If the specific latent heat of vaporization for water is 2.25 kJ/g, then the amount of heat required to vaporize 20 g of boiling water to steam at 100oC is

  45 J

  450 J

  4500 J

  45000 J

  Half-n-half Clue
 

3.

Water vapor is invisible.

  True

  False

 

4.

Latent heat = _______ × Specific latent heat.

  Volume

  Mass

  Weight

  Half-n-half Clue
 

5.

The amount of heat required to change a unit mass of a liquid into a gas, without changing its temperature, is referred to as the specific latent heat of _______.

  fusion

  vaporization

  fission

  Half-n-half Clue
 

6.

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 _______.

  8 to 12 minutes

  2 to 8 minutes

  0 to 2 minutes

  Half-n-half Clue
 

7.

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
 


 
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