Is this compatible with dell force10 s4148t-on qsfp+?

Yes. Dell force10 s4148t-on support 10GBASE-T transceiver use with QSA in QSFP+ port, 30m reach on CAT6a/7. And you may also need a suitable 40G QSFP+ breakout cables based on your needs to split a 40G QSFP port into 10G SFP+ ports.