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ICSE Class 10 Physics 2015 Paper

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In the diagram below, A,B,C,DA, B, C, D are four pendulums suspended from the same elastic string PQP Q. The length of AA and CC are equal to each other while the length of pendulum BB is smaller than that of DD. Pendulum A is set into a mode of vibrations.
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Question : 50 of 74
Marks: +1, -0
Name the type of vibrations taking place in pendulums BB and DD ?
Solution:  
B and D would be in the state of force vibration.
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