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GS Paper IUPSC Prelims 2007
Health & Medicine
Question No. 214Interactive Test Mode
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Q214. Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?

Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2007 • Science and Technology

Correct Answer: Option (D) — Vessel C

Concept & Option Breakdown

Standard Reference Verified

According to Torricelli's law, the initial ideal efflux velocity $v = \sqrt{2gh}$ is independent of the liquid's density. However, viscous drag and internal friction retard the real flow rate through the tap orifice. Kerosene has the lowest dynamic viscosity among the three liquids (kerosene < water < mercury), meaning it faces the minimum flow resistance and empties the fastest.

Elimination Heuristic & Exam Approach

Viscosity represents internal fluid resistance to flow. The least viscous liquid flows out fastest under identical gravitational heads.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2007 (Q214)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — Vessel C

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Frequently Asked Questions — UPSC Prelims 2007 Q214

What is the official answer for UPSC Prelims 2007 GS Paper I Question 214 (Science and Technology)?

The official UPSC answer key for this 2007 Science and Technology (Health & Medicine) question is Option (D): "Vessel C". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2007 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Viscosity represents internal fluid resistance to flow. The least viscous liquid flows out fastest under identical gravitational heads.

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