  We investigate the role of gap characteristics such as anisotropy and
inequality of the gaps in the quasiparticle interferences of iron pnictides
using a five-orbital tight-binding model. We examine how the difference in the
sensitivities exhibited by the sign-changing and -preserving $s$-wave
superconductivity in an annular region around ($\pi, 0$), which can be used to
determine the sign change of the superconducting gap, gets affected when the
gaps are unequal on the electron and hole pocket. In addition, we also discuss
how robust these differentiating features are on changing the quasiparticle
energy or when the gap is anisotropic.
