3 Rotational & Circular Motion questions from real MDCAT past papers (2020), each with the correct answer and a written explanation.
If during circular motion, tangential velocity of a body becomes double then centripetal force becomes:
Explanation
Centripetal force varies as v^2 (Fc = mv^2/r). Doubling the tangential speed multiplies Fc by 2^2 = 4, so the force becomes four times. Answers like 'double' or 'one half' ignore the square dependence on velocity.
2 more questions in this chapter
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The earth rotates on its axis once a day. Suppose, by dome process the earth contracts so that its radius is only half as large as at present, then how long the earth will take to complete its rotation?
Answer and explanation locked
1 radian is equal to:
Answer and explanation locked
Rotational & Circular Motion sits in the official PMDC Physics curriculum, the document that defines what can and cannot appear in the 2026 paper. Everything on this page is tagged against that curriculum rather than against a chapter list invented for a website, which is why a chapter here matches the chapter your textbook and your teacher use.
Physics carries 36 of the 180 questions in the real paper - 20% of your MDCAT score, and the MDCAT is half your merit aggregate. PMDC does not publish how those 36questions are split across chapters, so no honest page can tell you “expect four from Rotational & Circular Motion”. What the archive can tell you is what actually appeared: 3 Rotational & Circular Motion questions out of the 37 Physics questions digitised so far.
Work through them with the explanations rather than checking answer letters. The explanation says why the other three options are wrong, and distractors get reused across years far more reliably than whole questions do.