यदि 30 सेमी ऊँचाई वाले एक लंब वृत्तीय शंकु का आयतन 160π सेमी³ है, तो इसके आधार का व्यास ज्ञात कीजिए।

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 09 Jun, 2025 Shift 1)
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  1. 7 सेमी
  2. 16 सेमी
  3. 13 सेमी
  4. 8 सेमी

Answer (Detailed Solution Below)

Option 4 : 8 सेमी
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दिया गया है:

शंकु का आयतन (V) = 160π सेमी³

ऊँचाई (h) = 30 सेमी

प्रयुक्त सूत्र:

शंकु का आयतन, V = (1/3) x π x r² x h

जहाँ r = आधार की त्रिज्या

गणना:

160π = (1/3) x π x r² x 30

⇒ 160 = (1/3) x r² x 30

⇒ 160 x 3 = r² x 30

⇒ 480 = r² x 30

⇒ r² = 16

⇒ r = 4 सेमी

व्यास = 2 x r

⇒ व्यास = 2 x 4 = 8 सेमी

इसलिए, सही उत्तर विकल्प (4) है।

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