RAJASTHAN ­ PET Rajasthan PET Solved Paper-2006

  • question_answer
     A bucket full of water is kept in a room and it cools from\[80{}^\circ C\]to\[70{}^\circ C\]in\[{{t}_{1}}\]min from\[75{}^\circ C\]to \[70{}^\circ C\]in\[{{t}_{2}}\]min and from\[70{}^\circ C\]to\[65{}^\circ C\]in\[{{t}_{3}}\]min then

    A)  \[{{t}_{1}}<{{t}_{2}}<{{t}_{3}}\]       

    B)  \[{{t}_{1}}>{{t}_{2}}>{{t}_{3}}\]

    C)  \[{{t}_{2}}<{{t}_{1}}<{{t}_{3}}\]         

    D)  \[{{t}_{1}}>{{t}_{2}}>{{t}_{3}}\]

    Correct Answer: A

    Solution :

     According to Newton's law of cooling, the rate of heat loss varies directly with temperature. Hence, \[{{t}_{1}}<{{t}_{2}}<{{t}_{3}}\]


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