Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Shaft B is better than shaft A
Both the shafts are equally good
None of these
Shaft A is better than shaft B

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making the metal to metal contact
Have contact at the bottom most of the bearing

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