एका वृत्तचितीच्या पायाची त्रिज्या 4 सेमी वरून 16 सेमी पर्यंत वाढविली जाते, परंतु त्याचे वक्र पृष्ठफळ अपरिवर्तित राहते. जर वृत्तचितीची प्रारंभिक उंची 4 सेमी असेल, तर त्याची नवीन उंची किती?

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RRB Group D 19 Sept 2022 Shift 1 Official Paper
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  1. 2 सेमी
  2. 4 सेमी
  3. 3 सेमी
  4. 1 सेमी

Answer (Detailed Solution Below)

Option 4 : 1 सेमी
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Detailed Solution

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दिलेले आहे:

प्रारंभिक त्रिज्या (r) = 4 सेमी

नवीन त्रिज्या (R) = 16 सेमी

प्रारंभिक उंची (h) = 4 सेमी

नवीन उंची = H सेमी

दोन्ही परिस्थितीत वृत्तचितीचे वक्र पृष्ठफळ अपरिवर्तित राहते.

वापरलेले सूत्र:

वृत्तचितीचे वक्र पृष्ठफळ = 2πrh

येथे, r = वृत्तचितीची त्रिज्या

h = वृत्तचितीची उंची

गणना:

प्रारंभिक वक्र पृष्ठफळ = 2 × π × 4 × 4

= 32π सेमी2

नवीन वक्र पृष्ठफळ = 2 × π × 16 × H

= 32πH सेमी2

जसे, प्रारंभिक वक्र पृष्ठफळ = नवीन वक्र पृष्ठफळ

32π = 32πH

⇒ H = 1 सेमी

म्हणून, वृत्तचितीची नवीन उंची 1 सेमी असेल.

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