Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
necessary centripetal force may be obtained from the horizontal component of the weight of the train
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels

ANSWER DOWNLOAD EXAMIANS APP

Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate flashes of light
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves

ANSWER DOWNLOAD EXAMIANS APP