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

Transistor
Inductor
Diode
Capacitor

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Physics
A balloon filled with hydrogen will

Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and start coming down
Reach a particular height and remain floating

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The wavelength of electrons is smaller as compared to the wavelength of visible light
The electrons have more energy than the light particles
The velocity of electron is smaller than that of visible light
It uses more powerful lenses

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