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 · Rocks and Rock CycleMedium · 45s
Which of the following statements are true about basalt? It is dark-colored and fine-grained. It is extrusive in nature. It contains high silica content.
TopicRocks and Rock Cycle
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.
Basalt is dark and fine-grained with low silica. It is formed from lava, hence extrusive.
Final Answer: Option A — 1 and 2 only