AIEEE 2005 Physics Question Paper Mock Test

Starting with a sample of pure ${}^{66}\text{Cu}$, $7/8$ of it decays into $\text{Zn}$ in $15\text{ minutes}$. The corresponding half-life is:

If radius of ${}_{13}^{27}\text{Al}$ nucleus is estimated to be $3.6\text{ Fermi}$ then the radius ${}_{52}^{125}\text{Te}$ nucleus be nearly:

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is:

The figure shows a system of two concentric spheres of radii $r_1$ and $r_2$ and kept at temperatures $T_1$ and $T_2$ respectively. The radial rate of flow of heat in a substance between the two concentric sphere is proportional to:

A system goes from A to B via two processes I and II as shown in the figure. If $\Delta U_1$ and $\Delta U_2$ are the changes in internal energies in the processes I and II respectively, then: