ISRO's POEM platform repurposes which spent stage for microgravity experiments?
- PSLV fourth stage
- GSLV cryogenic stage
- LVM3 core stage
- SSLV terminal stage
Answer: PSLV fourth stage
PSLV Orbital Experimental Module (POEM) uses depleted PS4 stage as stabilized platform hosting payloads for weeks/months post-primary mission separation.