RRB NTPC CBT-1 previous year questionFind the sum of the surface areas of three spheres of radii 2 cm, 3 cm and 6 cm.
Find the sum of the surface areas of three spheres of radii 2 cm, 3 cm and 6 cm. 
Asked in RRB NTPC 2026 — 18 June Shift 2 · Quantitative Aptitude
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Correct answer: (A) 616 cm2
Total surface area = 4*pi*(22+32+62) = 4*pi*49 = 196*pi. Using pi=22/7, this equals 196 x 22/7 = 616 cm2.
हिंदी में प्रश्न
2 3 और 6 cm त्रिज्या वाले तीन गोलों के पृष्ठीय क्षेत्रफलों का योगफल ज्ञात कीजिए। (गा = --- का उपयोग कोजिए) 
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 608 cm?
कुल पृष्ठीय क्षेत्रफल = 4*pi*(22+32+62) = 4*pi*49 = 196*pi। pi=22/7 का उपयोग करने पर, यह 196 x 22/7 = 616 वर्ग सेमी के बराबर है।
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