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Question No. 75Interactive Test Mode
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Q75. With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct? 1. OMT is measured up to a depth of 26°C isotherm which is 129 metres in the south-western Indian Ocean during January–March. 2. OMT collected during January–March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean. Select the correct using the code given below:

With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct?

  1. OMT is measured up to a depth of 26°C isotherm which is 129 metres in the south-western Indian Ocean during January–March.
  2. OMT collected during January–March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean. Select the correct using the code given below:
Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

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Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2020 • Geography

Correct Answer: Option (B) — 2 only

Concept & Option Breakdown

Standard Reference Verified
  • Statement 1 is incorrect: In the southwestern Indian Ocean during January–March, the mean depth of the 26°C isotherm (D26) is approximately 59 metres, not 129 metres.
  • Statement 2 is correct: OMT during January–March has proven to be a much more reliable predictor for forecasting the Indian Summer Monsoon Rainfall than Sea Surface Temperature (SST), as it measures the thermal energy stored in the upper ocean layer.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2020 (Q75)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicGeography → Oceanography
Official Answer KeyOption (B) — 2 only

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Frequently Asked Questions — UPSC Prelims 2020 Q75

What is the official answer for UPSC Prelims 2020 GS Paper I Question 75 (Geography)?

The official UPSC answer key for this 2020 Geography (Oceanography) question is Option (B): "2 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2020 question belong to?

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

To solve Oceanography 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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