1.

Two identical conducting rods are first connected independently to two vessels, one containing water at 100^(@)C, and the other containing ice at 0^(@)C. In the second case, the rods are joined end to end and connected to the same vessels. Let q_(1),q_(2) gram/sec be the rate of melting of ice in the two cases respectively. The ratio q_(1)//q_(2) is :

Answer»

`1//2`
`2//1`
`4//1`
`1//4`.

Solution :Rate of melting of ICE `qprop(1)/(R )`, where R is thermal resistance.
`:.(q_(1))/(q_(2))=(R_(2))/(R_(1))`
Since `R_(1)=(R)/(2)` being in SERIES & `R_(2)=R+R=2R`.
`:.(q_(1))/(q_(2))=(4)/(1)`
Correct choice is (C).


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