RPF Constable practice question
How many metres of cloth 2 metres wide will be required to make a conical tent with the diameter of the base being 14 metres and its slant height being 9.5 metres? (Use π = )
From a RPF Constable General Awareness practice set · General Awareness
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Correct answer: (B) 104.5
Lateral surface area of the cone = πrl = (22/7)×7×9.5 = 22×9.5 = 209 m². With cloth 2 m wide, the length required = area/width = 209/2 = 104.5 m.
हिंदी में प्रश्न
14 मीटर आधार व्यास और 9.5 मीटर तिरछी ऊंचाई (slant height) वाला एक शंक्वाकार तंबू बनाने के लिए 2 मीटर चौड़े कपड़े के कितने मीटर की आवश्यकता होगी?
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सही उत्तर: (B) 104.5
शंकु का पार्श्व पृष्ठीय क्षेत्रफल = πrl = (22/7)×7×9.5 = 22×9.5 = 209 वर्ग मीटर। 2 मीटर चौड़े कपड़े के लिए आवश्यक लंबाई = क्षेत्रफल/चौड़ाई = 209/2 = 104.5 मीटर।
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