1.

In which case rate of flow of heat form P to Q is least:

A.  \[P-100{}^\circ C,\] \[Q-40{}^\circ C\]     
B.  \[P-90{}^\circ C,\] \[Q-10{}^\circ C\]
C.  \[P-50{}^\circ C,\] \[Q-10{}^\circ C\]       
D.  \[P-60{}^\circ C,\] \[Q-50{}^\circ C\]
Answer» D.  \[P-60{}^\circ C,\] \[Q-50{}^\circ C\]


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