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PhysicsJEE Main 22 Jan 2026, Shift 1·Q13·MCQ·Moderate

Thermal Properties of Matter · Heat transfer

Rods x and y of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points AA and FF are maintained at 100 ∘100\ ^\circC and 40 ∘40\ ^\circC respectively. Given the thermal conductivity of rod x is three times of that of rod y, the temperatures at junction points BB and EE are (close to):
  1. (1)89 ∘89\ ^\circC and 73 ∘73\ ^\circC respectively
  2. (2)80 ∘80\ ^\circC and 60 ∘60\ ^\circC respectively
  3. (3)80 ∘80\ ^\circC and 70 ∘70\ ^\circC respectively
  4. (4)60 ∘60\ ^\circC and 45 ∘45\ ^\circC respectively
We corrected a printing error in the original paper

Source printed “the temperature at junction points BB and EE are”.

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See the full 22 Jan 2026, Shift 1 paper