Physics
Absolute Zero is defined as

The temperature at which all molecular motion ceases
At which liquid Helium boils
At which water boils at 298K
At which the volume becomes zero

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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 wavelength of X-ray photon is less than the wavelength of visible radiation photon.
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.

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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