सीसे के 6 सेमी व्यास के कुछ गोले एक बेलनाकार बीकर में गिराए जाते हैं जिसमें कुछ पानी होता है ताकि वे पूर्णतः डूब जाएँ। यदि बीकर का व्यास 9 सेमी है और जल स्तर 32 सेमी बढ़ गया है, तो बीकर में गिराए गए सीसे के गोलों की संख्या ज्ञात कीजिए।

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  1. 14
  2. 18
  3. 15
  4. 16

Answer (Detailed Solution Below)

Option 2 : 18
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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दिया है:

गोले की त्रिज्या 3 सेमी है

बेलन की त्रिज्या और ऊँचाई 4.5 सेमी और 32 सेमी है

प्रयुक्त सूत्र:

गोले का आयतन = 4/3πr³

बेलन का आयतन = πr²h

गणना:

डाले गए गोलों का आयतन = बढ़ा हुआ पानी का आयतन

गोले की त्रिज्या = 6/2= 3 सेमी

बेलन की त्रिज्या = 9/2 = 4.5

अतः,

(4/3)π × (3)³ × गोलों की संख्या =  π (4.5) × (4.5) × 32

⇒ गोलों की संख्या = 18

∴ सही विकल्प विकल्प 2 है।

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