Solved papers for JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

done JEE Main Paper (Held On 19 May 2012) Total Questions - 1

• question_answer1) A large cylindrical rod of length L is made by joining two identical rods of copper and steel of length \[\left( \frac{L}{2} \right)\]each. The rods are completely In sulated from the surroundings. If the free end If copper rod is maintained at \[100{}^\circ C\] and that of steel at \[0{}^\circ C\] then the temperature of junction is Thermal conductivity of copper is 9 times that if steel)     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[90{}^\circ C\]
  done clear
  B)
  \[50{}^\circ C\]
  done clear
  C)
  \[10{}^\circ C\]           
  done clear
  D)
  \[67{}^\circ C\]
  done clear
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