P-N Junction Diode question from MHT CET 2025 (25 Apr, Shift 1)

Answer: (c)

1. Reverse bias: anode (arrow side) at a lower potential than the cathode (bar side).
2. (a) anode $+6\ \text{V}$, cathode side $-2\ \text{V}$: forward. (d) anode $+6\ \text{V}$ via R, cathode at 0 V: forward.
3. (b) anode at $-5\ \text{V}$ via R, cathode $3\ \text{V}$: reverse. (c) anode at 0 V (ground), cathode at $10\ \text{V}$ via R: reverse.
4. Figure (b) is reverse biased, so the answer is (c) b.