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Solution


Q.

Consider two cylindrical rods of identical dimensions, one of rubber and the other of steel. Both the rods are fixed rigidly at one end to the roof. A mass M is attached to each of the free ends at the centre of the rods.
1 Both the rods will elongate but there shall be no perceptible change in shape  
2 The steel rod will elongate and change shape but the rubber rod will only elongate  
3 The steel rod will elongate without any perceptible change in shape, but the rubber rod will elongate and the shape of the bottom edge will change to an ellipse  
4 The steel rod will elongate, without any perceptible change in shape, but the rubber rod will elongate with the shape of the bottom edge tapered to a tip at the centre  

Ans.

(4)

Rubber experiences larger lateral strain than steel.