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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 cut through the ice. The phenomenon where the ice above the wire refreezes is called _______.

  regelation

  sublimation

  subtraction

  regeneration

  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 melting point of naphthalene is _______oC.

  60

  80

  90

  Half-n-half Clue
 

3.

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

  vaporization

  fission

  fusion

  Half-n-half Clue
 

4.

Vaporization point and _______ have the same numerical value.

  melting point

  liquefaction point

  solidification point

  fusion point

  Half-n-half Clue
 

5.

If 1980 J of heat are released on changing 6 g of water at 0oC to ice at 0oC, the specific latent heat of fusion for water is

  0.33 J/g

  0.66 J/g

  330 J/g

  660 J/g

  Half-n-half Clue
 

6.

With _______ in pressure, water boils above 100oC.

  an increase

  a decrease

 

7.

Latent heat = _______ × Specific latent heat.

  Weight

  Volume

  Mass

  Half-n-half Clue
 


 
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