यदि किसी द्रव का गतिज श्यानता 0.011 पाॅइस है और विशिष्ट गुरुत्व 0.95 है तो स्टोक्स में उस द्रव की शुद्धगतिक श्यानता होगी:

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UKPSC JE Civil 8 May 2022 Official Paper-II
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  1. 0.0116
  2. 0.116
  3. 0.0611
  4. 0.611

Answer (Detailed Solution Below)

Option 1 : 0.0116
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संकल्पना:

\(\nu={μ\over ρ}\)

जहाँ \(\nu\) = शुद्धगतिक श्यानता, μ = गतिक श्यानता और ρ = द्रव्यमान घनत्व

गणना:

दिया गया है; μ = 0.011 पाॅइस, और विशिष्ट गुरुत्व (S.G.) = 0.95

हम जानते हैं कि, 1 पाॅइस = 0.1 Pa-sec.

μ = 0.0011 Pa-sec, ρ = 950 kg/m3

शुद्ध गतिक श्यानता(\(\nu\)) = \({0.0011\over 950}\) = 1.1578 × 10-6 m2/s या 0.0116 स्टोक्स

शुद्ध गतिक श्यानता (\(\nu\)) 0.0116 स्टोक्स है, इस प्रकार विकल्प (2) सही है।

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