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GS Paper IUPSC Prelims 2008
Health & Medicine
Question No. 416Interactive Test Mode
00:00
+2-0.66

Q416. What is the pH level of blood of a normal person?

What is the pH level of blood of a normal person?

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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2008 • Science and Technology

Correct Answer: Option (C) — 7.35–7.45

Concept & Option Breakdown

Standard Reference Verified

The normal physiological pH of human arterial blood is strictly maintained within the narrow, slightly alkaline range of 7.35 to 7.45. This tight homeostatic range is stabilized by carbonic acid-bicarbonate buffer systems, renal regulation, and respiratory compensation.

Elimination Heuristic & Exam Approach

Human blood is slightly basic (alkaline), just above neutral 7.0, specifically in the 7.35–7.45 range.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2008 (Q416)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — 7.35–7.45

Related & Repeated Prelims PYQs (2)

Questions from other UPSC Prelims years testing the same or closely linked concept.

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2000 • Q48381% Match

The blood glucose level is commonly expressed as:

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2002 • Q46780% Match

With reference to the blood in a normal person, which one of the following statements is correct?

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Frequently Asked Questions — UPSC Prelims 2008 Q416

What is the official answer for UPSC Prelims 2008 GS Paper I Question 416 (Science and Technology)?

The official UPSC answer key for this 2008 Science and Technology (Health & Medicine) question is Option (C): "7.35–7.45". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2008 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?

Human blood is slightly basic (alkaline), just above neutral 7.0, specifically in the 7.35–7.45 range.

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