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GS Paper IUPSC Prelims 1999
Health & Medicine
Question No. 309Interactive Test Mode
00:00
+2-0.66

Q309. Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because:

Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because:

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 1999 • Science and Technology

Correct Answer: Option (C) — barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.

Concept & Option Breakdown

Standard Reference Verified

Barium sulfate (BaSO₄) is an insoluble radiopaque contrast medium. Because barium has a high atomic number (Z = 56), it strongly absorbs X-rays (due to photoelectric absorption), coating the lining of the gastrointestinal tract and providing sharp radio-contrast against soft tissues on radiographs.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1999 (Q309)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.

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Frequently Asked Questions — UPSC Prelims 1999 Q309

What is the official answer for UPSC Prelims 1999 GS Paper I Question 309 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Health & Medicine) question is Option (C): "barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1999 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?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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