Physics
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

The speeds of both the photons in vacuum are different
The frequency of X-ray photon is higher than the frequency of visible radiation photon.
Both the photons have different energies.
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.

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Physics
The bats can fly in the dark because

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

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Physics
Hydro-electric power is a:

A mixture of renewable and non-renewable natural resource
Renewable natural resource
Neither renewable nor non renewable resource
non-renewable natural resource

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