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GS Paper IUPSC Prelims 2004
Health & Medicine
Question No. 219Interactive Test Mode
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+2-0.66

Q219. A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

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 2004 • Science and Technology

Correct Answer: Option (D) — zero

Concept & Option Breakdown

Standard Reference Verified

According to Archimedes' principle, the apparent weight of a body immersed in a fluid is equal to its actual weight in air minus the buoyant force (weight of the displaced fluid). Since the balloon is weightless and filled with 200 cc of water, it displaces exactly 200 cc of water when immersed. The buoyant force equals the gravitational weight of the enclosed water, resulting in an apparent net weight of zero.

Elimination Heuristic & Exam Approach

An object made of the same fluid as its surroundings is neutrally buoyant; its apparent submerged weight is always zero.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2004 (Q219)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — zero

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Frequently Asked Questions — UPSC Prelims 2004 Q219

What is the official answer for UPSC Prelims 2004 GS Paper I Question 219 (Science and Technology)?

The official UPSC answer key for this 2004 Science and Technology (Health & Medicine) question is Option (D): "zero". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2004 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?

An object made of the same fluid as its surroundings is neutrally buoyant; its apparent submerged weight is always zero.

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