NEET UG 2005 — Thermodynamics

An ideal gas heat engine operates in carnot cycle between $227^{\circ} \mathrm{C}$ and $127^{\circ} \mathrm{C}$. It absorbs $6 \times 10^4$ cal of heat at higher temperature. Amount of heat converted into work, is:

The temperature of inversion of a thermocouple is $620^{\circ} \mathrm{C}$ and the neutral temperature is $300^{\circ} \mathrm{C}$. What is the temperature of cold junction?

Which of the following rods, (given radius $r$ and length $l$) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

Which of the following processes is reversible?