Physics
A spherical ball made of steel when dropped in mercury container

Sink in mercury
Will be on the surface of mercury
Will dissolve in mercury
Will be partly immersed mercury

ANSWER DOWNLOAD EXAMIANS APP

Physics
Railway tracks are banked on curves so that

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train

ANSWER DOWNLOAD EXAMIANS APP