RRB NTPC CBT-1 previous year question
A spherical tank has a diameter of 28 cm. What is the total surface area of the tank? (Use π = 22/7)
Asked in RRB NTPC 2026 — 15 June Shift 2 · Quantitative Aptitude
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Correct answer: (C) 2464 cm²
For a sphere, TSA = 4πr². Diameter=28 cm so radius=14 cm. TSA = 4×(22/7)×14×14 = 2464 cm².
हिंदी में प्रश्न
एक गोलाकार टंकी का व्यास 28 cm है। टंकी का संपूर्ण पृष्ठीय क्षेत्रफल ज्ञात कीजिए। (wr = 22 उपयोग काजिए)
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 2464 cm? आओ
गोले के लिए, TSA = 4πr²। व्यास=28 सेमी अतः त्रिज्या=14 सेमी। TSA = 4×(22/7)×14×14 = 2464 वर्ग सेमी है।
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