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ICSE Class 10 Physics 2015 Solved Paper

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In the diagram below, A,B,C,D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations.
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Question : 51
Total: 74
What is the state of pendulum C ?
Solution:  
Since the length of pendulum C is same as that of A therefore it is in the state of resonance.
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