We consider the pair of second-order dynamic equations, ( r ( t ) ( x Δ ) γ ) Δ + p ( t ) x γ ( t ) = 0 and ( r ( t ) ( x Δ ) γ ) Δ + p ( t ) x γ σ ( t ) = 0 , on a time scale T , where γ > 0 is a quotient of odd positive integers. We establish some necessary and sufficient conditions for nonoscillation of Hille-Kneser type. Our results in the special case when T = ℝ involve the well-known Hille-Kneser-type criteria of second-order linear differential equations established by Hille. For the case of the second-order half-linear differential equation, our results extend and improve some earlier results of Li and Yeh and are related to some work of Došlý and Řehák and some results of Řehák for half-linear equations on time scales. Several examples are considered to illustrate the main results.