6 सेमी व्यासाचे काही शिशाचे गोळे एका वृत्तचितीकार बीकरमध्ये टाकले जातात ज्यामध्ये थोडेसे पाणी असते जेणेकरून ते पूर्णपणे बुडलेले असतात. बीकरचा व्यास 9 सेमी असल्यास आणि पाण्याची पातळी 32 सेमीने वाढली असल्यास, बीकरमध्ये टाकलेल्या शिश्याच्या गोळ्यांची संख्या शोधा.

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NTPC CBT-I (Held On: 4 Jan 2021 Shift 2)
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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)
100 Qs. 100 Marks 90 Mins

Detailed Solution

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दिलेल्याप्रमाणे:

गोळ्याची त्रिज्या 3 सेमी आहे

वृत्तचितीची त्रिज्या आणि उंची 4.5 सेमी आणि 32 सेमी आहे

वापरलेले सूत्र:

गोळ्याचे घनफळ = 4/3πr³

वृत्तचितीचे घनफळ = πr²h

गणना:

घातलेल्या गोळ्याचे घनफळ = पाण्याचे वाढलेले प्रमाण

गोळ्याची त्रिज्या = 6/2 = 3 सेमी

वृत्तचितीची त्रिज्या = 9/2 = 4.5

म्हणून,

(4/3)π × (3)³ × गोळ्यांची संख्या = π (4.5) × (4.5) × 32

⇒ गोळ्यांची संख्या = 18

∴ योग्य उत्तर पर्याय 2 आहे.

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