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                              Q:
                           
                           
                                                      | A) Principle of thermal equilibrium | B) Principle of colors | 
| C) Principle of calorimetry | D) Principle of vaporization | 
                              Answer:   C) Principle of calorimetry
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Heat lost by hot object = Heat gained by cold object
where we ignore heat gained or lost from/to the surroundings.
The study of heat gained and lost in this manner is often called Calorimetry.
 
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