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The free end of the pendulum string is fixed to a support that is:

ASlack
BRigid
CLoose
DBouncy
Answer & Solution
Correct answer: B. Rigid
1. The pivot must not move as the bob swings. 2. Any give in it would alter the motion. 3. So the support is rigid. _Source: syllabus Physics Part II, Chapter 14, Oscillations._
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