20 सेमी व्यासाच्या काचेच्या वृत्तचित्तीमध्ये 9 सेमी उंचीपर्यंत पाणी असते. त्यात 8 सेंमी काठाचा एक धातूचा घन पूर्णपणे बुडविला जातो. उंचीची (1 दशांश स्थानापर्यंत योग्य)  गणना करा जिथपर्यंत वृत्तचित्तीध्ये पाणी वाढेल.
(π = 3.142 घ्या).

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NTPC CBT-I (Held On: 16 Jan 2021 Shift 1)
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  1. 1.4 सेमी 
  2. 2 सेमी 
  3. 1.6 सेमी 
  4. 2.6 सेमी 

Answer (Detailed Solution Below)

Option 3 : 1.6 सेमी 
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

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दिलेल्याप्रमाणे:

20 सेमी व्यासाच्या काचेच्या वृत्तचित्तीमध्ये 9 सेमी उंचीपर्यंत पाणी असते. त्यात 8 सेंमी काठाचा एक धातूचा घन पूर्णपणे बुडविला जातो.

सूत्र:

वृत्तचित्तीचे घनफळ  = Πr2h

घनाचे घनफळ = a3 

गणना:

वृत्तचित्तीचा व्यास = 20 सेमी 

⇒ वृत्तचित्तीची त्रिज्या = 10 सेमी 

आता, विस्थापित पाण्याचे घनफळ (ज्यामुळे वृत्तचित्तीमध्ये पाणी वाढेल) = घनाचे घनफळ

∴ πr2h = a3

⇒ 3.142 × 10 × 10 × h = 83

⇒ 3142 × 1/10 × h = 512

⇒ h = 5120/3142 

⇒ h = 1.62 सेमी ~ 1.6 सेमी 

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