A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about geometrical axis. It is possible with (a) aluminium at interior and iron surround to it (b) iron at interior and aluminium surround to it (c) using iron and aluminium layers in alternate order (d) sheet of iron is used at both external surface and aluminium sheet as internal layers.

Answer: (a). I = Σ mr²: mass far from the axis contributes most. Iron is denser, so more mass should be placed at the rim. So the answer is (a) aluminium inside, iron around it.

A circular disc is to be made by using iron and aluminium so that it… | NEET 2002 (AIPMT)

Q199NEET 2002 · AIPMTEasy

Moment of Inertia & Radius of Gyration

A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about geometrical axis. It is possible with

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Answer: (a)

$I = \sum mr^2$ : mass far from the axis contributes most.
Iron is denser, so more mass should be placed at the rim.
So the answer is (a) aluminium inside, iron around it.

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