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GS Paper IUPSC Prelims 2011
Space & ISRO
Question No. 122Interactive Test Mode
00:00
+2-0.66

Q122. Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when: 1. The orbit is geosynchronous. 2. The orbit is circular. 3. The orbit lies in the plane of the Earth’s equator. 4. The orbit is at an altitude of 22,236 km. Select the correct answer using the codes given below:

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:

  1. The orbit is geosynchronous.
  2. The orbit is circular.
  3. The orbit lies in the plane of the Earth’s equator.
  4. The orbit is at an altitude of 22,236 km. Select the correct answer using the codes given below:
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 2011 • Science and Technology

Correct Answer: Option (A) — 1, 2 and 3 only

Concept & Option Breakdown

Standard Reference Verified

Statements 1, 2, and 3 are correct: A geostationary orbit (GEO) is a circular geosynchronous orbit with zero inclination (lying directly in Earth's equatorial plane) and an orbital period equal to Earth's rotational period (23 hours, 56 minutes, 4 seconds), appearing motionless to a ground observer.

Statement 4 is incorrect: The altitude of a geostationary orbit is approximately 35,786 km (about 22,236 miles, not kilometers).

Elimination Heuristic & Exam Approach

Note the unit trap: 22,236 is the altitude in miles, but in kilometers it is ~35,786 km. Eliminating 4 gives the correct option (a).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2011 (Q122)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Space & ISRO
Official Answer KeyOption (A) — 1, 2 and 3 only

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Frequently Asked Questions — UPSC Prelims 2011 Q122

What is the official answer for UPSC Prelims 2011 GS Paper I Question 122 (Science and Technology)?

The official UPSC answer key for this 2011 Science and Technology (Space & ISRO) question is Option (A): "1, 2 and 3 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2011 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Space & ISRO". You can explore all repeated questions from Space & ISRO 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 Space & ISRO UPSC Prelims question using option elimination?

Note the unit trap: 22,236 is the altitude in miles, but in kilometers it is ~35,786 km. Eliminating 4 gives the correct option (a).

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