No. Micromax Bharat 4 does not have a fingerprint scanner.
Yes, you can use it. But at any given time, one sim will work on 4G network and another will work in 3G network.
No. Micromax Bharat 4 does not have the hybrid sim slots. It has 2 dedicated sim slots and 1 dedicated MicroSD card slot.
Yes, Micromax Bharat 4 does have the front camera flash.
Micromax Bharat 4 comes with Android Nougat 7.0 OS.