  We study translocation dynamics of a driven compressible semi-flexible chain
consisting of alternate blocks of stiff ($S$) and flexible ($F$) segments of
size $m$ and $n$ respectively for different chain length $N$ in two dimension
(2D). The free parameters in the model are the bending rigidity $\kappa_b$
which controls the three body interaction term, the elastic constant $k_F$ in
the FENE (bond) potential between successive monomers, as well as the segmental
lengths $m$ and $n$ and the repeat unit $p$ ($N=m_pn_p$) and the solvent
viscosity $\gamma$. We demonstrate that due to the change in entropic barrier
and the inhomogeneous viscous drag on the chain backbone a variety of scenarios
are possible amply manifested in the waiting time distribution of the
translocating chain. These information can be deconvoluted to extract the
mechanical properties of the chain at various length scales and thus can be
used to nanopore based methods to probe bio-molecules, such as DNA, RNA and
proteins.
