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Plaque narrows an artery, blood speeds up there and pressure drops. The artery may:
ACollapse
BExpand
CHarden
DWarm up
Answer & Solution
Correct answer: A. Collapse
1. Faster flow means lower inside pressure.
2. Outside pressure then wins.
3. The artery may collapse, which can cause a heart attack.
_Source: NCERT Class 11 Physics Part II, Chapter 10, Mechanical Properties of Fluids._
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