Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Internal Structure of The EarthMedium · 45s
Consider the following statements: Sial is lighter than Sima. Sima constitutes the oceanic crust mainly.Which of these 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.
Sial (silica-alumina) is less dense and forms continents; Sima (silica-magnesium) forms oceanic crust.
Final Answer: Option C — Both 1 and 2