Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · Internal Structure of The EarthMedium · 45s
Consider the following statements: Earth’s mantle extends to a depth of about 2,900 km. The mantle is composed mainly of peridotite.Which is/are correct?
TopicInternal Structure of The Earth
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Both statements are correct; peridotite is ultramafic rock in the mantle.
Final Answer: Option C — Both 1 and 2