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.

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Multiple choice

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A uniform solid sphere of radius R having moment of inertia I about its diameter is melted to form a uniform disc of thickness t and radius r. The moment of inertia of the disc about an axis passing through its edge and perpendicular to its plane is equal to the moment of inertia of the sphere about its tangent, then the radius of the disc is:   [ √(7/5) ]R   [ √(14/15) ]R   [ √(2/15) ]R   [ √(4/15) ]R   Hint Half-n-half Clue

 

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