डॉ. होमी भाभा यांनी तयार केलेल्या भारताच्या 3 टप्पा अणुउर्जा प्रकल्प पूर्ण होण्यासाठी प्रत्येक टप्यात वापरात येणाऱ्या विक्रियकांचा योग्य अनुक्रम निवडा.
अ. थोरीअम इंधन म्हणून वापरणारा जडपाणी विक्रीयक.
ब. प्लुटोनिअम इंधन म्हणून वापरणारा द्रूतगति प्रजनक विक्रीयक.
क. थोरीअम इंधन म्हणून वापरणारा प्रगत अणूउर्जा तंत्र विक्रीयक.
ड. युरॅनिअम इंधन म्हणून वापरणारा जडपाणी, विक्रीयक.
योग्य पर्याय निवडा :

The correct answer is Option B (1st d, 2nd b and 3rd c).

Key Points:
• Dr. Homi J. Bhabha's Three-Stage Nuclear Power Programme was formulated in 1954 to utilize India's modest uranium reserves alongside vast monazite thorium reserves:
• The Three Stages in Sequence:
• 1. Stage 1 (ड): Pressurised Heavy Water Reactors (PHWRs) using natural Uranium (²38U) as fuel and Heavy Water (D₂O) as moderator/coolant; breeds fissile Plutonium (²39Pu) as a byproduct.
• 2. Stage 2 (ब): Fast Breeder Reactors (FBRs) (e.g., PFBR Kalpakkam) using Plutonium (²39Pu) extracted from Stage 1 as core fuel with a Thorium blanket to breed Uranium-233 (²33U).
• 3. Stage 3 (क): Advanced Nuclear Power Systems / Advanced Heavy Water Reactors (AHWR) utilizing Thorium-232 (²32Th) fueled with fissile Uranium-233 (²33U) to achieve self-sustaining energy.
• Therefore, the correct chronological order is 1st d, 2nd b, and 3rd c (Option 2).
• Key Takeaway: India's 3-stage nuclear program proceeds: Stage 1 PHWR (natural Uranium), Stage 2 FBR (Plutonium), and Stage 3 AHWR (Thorium/U-233).