Which ISRO launch vehicle uses four liquid strap-on boosters derived from the Vikas engine?
- PSLV-Core
- PSLV-XL
- GSLV Mk II
- SSLV
Answer: GSLV Mk II
GSLV Mk II employs four L40 liquid strap-ons using Vikas engines burning UDMH/N2O4, augmenting core stage thrust during initial ascent.