IIT JEE 2007 Practice : PHYSICS - Multiple Choice

Each question below has only one correct answer.
In the IIT-JEE, you will be awarded 3 marks for each correct answer and −1 for each incorrect answer.
You will be awarded 0 marks for not attempting a question.

Quiz

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Multiple choice

Your Performance  

A massless rod BD of length L is suspended by two identical strings AB and CD of equal length as shown in the figure. A block of mass 2m is suspended at a point P. If the first harmonic frequency of the string AB is equal to the third harmonic frequency of the string CD when excited by a tuning fork, then the length PD is   3L/4   L/10   4L/5   L/5   Hint Half-n-half Clue

 

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