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GS Paper IUPSC Prelims 2006
Health & Medicine
Question No. 215Interactive Test Mode
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Q215. What is the approximate mean velocity with which the earth moves round the sun in its orbit?

What is the approximate mean velocity with which the earth moves round the sun in its orbit?

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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2006 • Science and Technology

Correct Answer: Option (B) — 30 km/s

Concept & Option Breakdown

Standard Reference Verified

Earth's average orbital distance from the Sun is $r \approx 1.496 \times 10^8\text{ km}$. The orbital circumference is $2\pi r \approx 9.40 \times 10^8\text{ km}$. The time period is 1 year $\approx 365.25 \times 24 \times 3600\text{ s} \approx 3.156 \times 10^7\text{ s}$. Orbital speed $v = \frac{2\pi r}{T} \approx \frac{9.40 \times 10^8}{3.156 \times 10^7} \approx 29.8\text{ km/s} \approx 30\text{ km/s}$.

Elimination Heuristic & Exam Approach

Standard physics fact: Earth's orbital velocity around the sun is $\approx 29.8\text{ km/s} \approx 30\text{ km/s}$.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2006 (Q215)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 30 km/s

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2007 • Q983% Match

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Frequently Asked Questions — UPSC Prelims 2006 Q215

What is the official answer for UPSC Prelims 2006 GS Paper I Question 215 (Science and Technology)?

The official UPSC answer key for this 2006 Science and Technology (Health & Medicine) question is Option (B): "30 km/s". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2006 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?

Standard physics fact: Earth's orbital velocity around the sun is $\approx 29.8\text{ km/s} \approx 30\text{ km/s}$.

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