जब एक बेलन की त्रिज्या 4 सेमी बढ़ाई जाती है, तो इसका पार्श्व पृष्ठीय क्षेत्रफल \(\frac{2464}{7}\) सेमी2 बढ़ जाता है। यदि इसकी त्रिज्या 6 सेमी है, तो बेलन का आयतन (सेमी3 में) क्या है? (\(\pi =\frac{22}{7}\) का प्रयोग करें)

This question was previously asked in
MPPGCL JE Electrical 28 April 2023 Shift 3 Official Paper
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  1. 1625
  2. 1496
  3. 1548
  4. 1584

Answer (Detailed Solution Below)

Option 4 : 1584
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दिया गया है:

त्रिज्या में वृद्धि = 4 सेमी

पार्श्व पृष्ठीय क्षेत्रफल में वृद्धि = 2464/7 सेमी2

मूल त्रिज्या = 6 सेमी

π = 22/7

प्रयुक्त सूत्र:

बेलन का पार्श्व पृष्ठीय क्षेत्रफल = 2πrh

बेलन का आयतन = πr2h

गणना:

2π(r+4)h - 2πrh = 2464/7

⇒ 2πh(r+4-r) = 2464/7

⇒ 2πh(4) = 8πh = 2464/7

⇒ h = (2464/7) / (8 × 22/7)

h = 14

आयतन = πr2h

⇒ (22/7) × 62 × 14

⇒ (22/7) × 36 × 14

⇒ 22 × 36 × 2 = 1584

∴ बेलन का आयतन = 1584 सेमी3

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