Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Density of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
to avoid frictional force between the tracks and wheels
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

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

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

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