RRB NTPC CBT-1 previous year questionA hollow spherical shell is made of a metal of density 10 g/cm3. Its internal and external radius are 1 cm and 4 cm, respectively. What is the weight (in kg) of the shell?
A hollow spherical shell is made of a metal of density 10 g/cm3. Its internal and external radius are 1 cm and 4 cm, respectively. What is the weight (in kg) of the shell? 
Asked in RRB NTPC 2026 — 16 June Shift 2 · Quantitative Aptitude
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Correct answer: (D) 2.64
Volume of hollow shell = 4/3×π×(R3−r3) = 4/3×22/7×(43−13) = 264 cm3; weight = 264×10 g = 2640 g = 2.64 kg.
हिंदी में प्रश्न
एक खोखला गोलीय कोश 10 gicm? घनत्व वाली धातु से बना है। इसकी आंतरिक और बाहा त्रिज्याएं क्रमशः 1 cm SR 4 cm है। कोश का वजन (kg में) कितना है? और घनत्व - द्रव्यमान/आयतन का उपयोग काौजिए 
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सही उत्तर: (D) 2.24
खोखले गोले का आयतन = 4/3×π×(R3−r3) = 4/3×22/7×(43−13) = 264 सेमी3; वजन = 264×10 ग्राम = 2640 ग्राम = 2.64 किग्रा है।
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