Physics
The device which transfer the signal from low resistance region to high resistance region is

Capacitor
Transistor
Inductor
Diode

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Physics
Railway tracks are banked on curves

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

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Physics
To resolve an object in an electron microscope,

Both A & B
None of these
The wavelength of the electrons must be close to the diameter of the object
The wavelength of the electrons must be greater than the diameter of the object.

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