RRB NTPC CBT-1 previous year questionA hollow cylinder of thickness 1 unit and length 14 units is made with 396 cubic units of metal. Its inner volume is _____ cubic units. (Take )
A hollow cylinder of thickness 1 unit and length 14 units is made with 396 cubic units of metal. Its inner volume is _____ cubic units. (Take ) 
Asked in RRB NTPC 2026 — 16 June Shift 3 · Quantitative Aptitude
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Correct answer: (B) 704
With thickness 1 and outer radius R=r+1, metal volume: π(R2−r2)×14=396 gives (2r+1)=396/(14×22/7)=9, so r=4; inner volume=22/7×42×14=704 cubic units.
हिंदी में प्रश्न
1 इकाई मोटाई और 14 इकाई लंबाई वाले एक खोखले बेलन का निर्माण धातु की 396 घन इकाई से किया गया है। इसका आंतरिक आयतन घन इकाई होगा। (7. = --- मानिए) 
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सही उत्तर: (B) 636
मोटाई 1 और बाहरी त्रिज्या R=r+1 के साथ, धातु आयतन: π(R2−r2)×14=396 से (2r+1)=396/(14×22/7)=9, अतः r=4; आंतरिक आयतन=22/7×42×14=704 घन इकाई है।
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