  We investigate the scissors modes in binary mixtures of degenerate dilute
quantum gases, for both Bose-Bose and Bose-Fermi mixtures. For the latter we
consider both the superfluid and normal hydrodynamic and collisionless regimes.
We analyze the dependence of the frequencies of the scissors modes and their
character as a function of the Bose-Fermi coupling and the trap geometry. We
show that the scissors mode can reveal a clear trace of the hydrodynamic
behavior of the Fermi gas.
