1.

The coefficients of thermal conductivity of copper, mercury and glass are respectively Kc, Km and Kg such that Kc > Km > Kg. If the same quantity of heat is to  flow per second per unit area of each and corresponding temperature gradients are Xc, Xm and Xg, then           [MP PMT 1990]

A.            \[{{X}_{c}}={{X}_{m}}={{X}_{g}}\]  
B.            \[{{X}_{c}}>{{X}_{m}}>{{X}_{g}}\]
C.            \[{{X}_{c}}<{{X}_{m}}<{{X}_{g}}\]  
D.            \[{{X}_{m}}<{{X}_{c}}<{{X}_{g}}\]
Answer» D.            \[{{X}_{m}}<{{X}_{c}}<{{X}_{g}}\]


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