  This letter presents a search for singly produced vector-like quarks, Q,
coupling to light quarks, q. The search is sensitive to both charged current
(CC) and neutral current (NC) processes, p p --> Q q --> W q q' and p p --> Q q
--> Z q q' with a leptonic decay of the vector gauge boson. In 1.04/fb of data
taken in 2011 by the ATLAS experiment at a center-of-mass energy sqrt(s) = 7
TeV, no evidence of such heavy vector-like quarks is observed above the
expected Standard Model background. Limits on the heavy vector-like quark
production cross section times branching ratio as a function of mass m_Q are
obtained. For a coupling kappa_(qQ) = v/m_Q, where v is the Higgs vacuum
expectation value, 95% C.L. lower limits on the mass of a vector-like quark are
set at 900 GeV and 760 GeV from CC and NC processes, respectively.
